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Ajay, Akhil. "Nanofils de GaN/AlGaN pour les composants quantiques". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY030/document.
Pełny tekst źródłaDue to its novel properties nanowires have emerged as promising building blocks for various advanced device applications. This work focuses on Intersubband (ISB) engineering of nanowires where we custom design GaN/(Al,Ga)N heterostructures to be inserted in a GaN nanowire to render it optically active in the infrared (IR) spectral region. ISB transitions refer to energy transitions between quantum confined levels in the conduction band of the nanostructure. All the structures analised in this thesis were synthesized by plasma-assisted molecular beam epitaxy.Precise control of high doping levels is crucial for ISB devices. Therefore, we explored Ge as an alternative dopant for GaN and AlGaN, to replace commonly-used Si. We grew Ge-doped GaN thin films with carrier concentrations of up to 6.7 × 1020 cm−3 at 300 K, well beyond the Mott density, and we obtained conductive Ge-doped AlxGa1-xN thin films with an Al mole fraction up to x = 0.66. In the case of GaN, the presence of Ge does not affect the growth kinetics or structural properties of the samples. However, in Ge doped AlxGa1-xN samples with x > 0.4 the formation of Ge rich clusters was observed, together with a drop in the carrier concentration.Then, we performed a comparative study of Si vs. Ge doping in GaN/AlN heterostructures for ISB devices in the short-wavelength IR range. We considered both planar and nanowire architectures with identical doping levels and well dimensions. Based on this study, we concluded that both Si and Ge are suitable dopants for the fabrication of GaN/AlN heterostructures for the study of ISB optoelectronic phenomena, both in planar and nanowire heterostructures. Within this study, we reported the first observation of ISB absorption in Ge-doped GaN/AlN quantum wells and in Si-doped GaN/AlN nanowire heterostructures. In the case of nanowires, we obtained a record ISB absorption linewidth in the order of 200 meV. However, this value is still larger than that observed in planar structures, due to the inhomogeneities associated to the self-assembled growth process.Trying to reduce the inhomogeneities while keeping the advantages of the nanowire geometry, we also presented a systematic analysis of ISB absorption in micro- and nanopillars resulting from top-down processing GaN/AlN planar heterostructures. We showed that, when the spacing of the pillar array is comparable to the probed wavelengths, photonic crystal resonances dominate the absorption spectra. However, when these resonances are at much shorter wavelengths than the ISB absorption, the absorption is clearly observed, without any degradation of its magnitude or linewidth.We also explore the possibility to extend this nanowire technology towards longer wavelengths, to absorb in the mid-wavelength IR region. Using GaN/AlN nanowire heterostructures, we varied the GaN well width from 1.5 to 5.7 nm, which led to a red shift of the ISB absorption from 1.4 to 3.4 µm. Replacing the AlN barriers by Al0.4Ga0.6N, the reduction of polarization led to a further red shift of the ISB transitions to 4.5-6.4 µm.The observation of ISB absorption in nanowire ensembles motivated us for the development of a nanowire-based quantum well infrared photodetector (NW-QWIP). The first demonstration of such a device, incorporating a GaN/AlN nanowire heterostructure that absorbs at 1.55 µm, is presented in this manuscript
Richard, Mikaël. "Développement des composants passifs pour les circuits MMICs en GaN". Paris 6, 2009. http://www.theses.fr/2009PA066677.
Pełny tekst źródłaChihani, Omar. "Etude de la fiabilité de composants GaN en conversion d'énergie". Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0148/document.
Pełny tekst źródłaThe aeronautical and terrestrial transport industries know a steady increase in the electrification of their functions. In fact, the mechanical or hydraulic actuators are gradually replaced by electric ones.The components dominating the market today seem unable to follow the trend anymore. In fact, silicon-based power components still prevail in the current market, thanks to their low cost. However, this material begins to reach its theoretical limits in terms of performance. In this context, different wide bandgap semiconductor structures are emerging to take on from silicon.The aim of this study is to assess the reliability of power transistors based on Gallium Nitride. These components are very promising for medium power applications. However, the failure mechanisms of these components are not yet sufficiently studied. The study consists in the application of aging tests combining thermal and electrical stresses. These agings are carried out under different conditions of tension and temperature. The objective of this method is, firstly, to isolate the effect of each stressor on the state of the components, and secondly, to identify the failure mechanisms activated according to the aging conditions.This work made it possible to identify the existence of different failure mechanisms that can be activated according to the aging conditions. Indeed, it has emerged that the aging temperature range used influences the predominance of activated failure mechanisms. The results challenge the adequacy of current qualification standards for Gallium Nitride components. These standards should revise upwards the aging temperatures used to cover ranges closer to the operating temperatures of this kind of components
Vandenbrouck, Simon. "Composants plasmoniques à base d’hétérojonction AlGaN/GaN pour les applications terahertz". Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10165/document.
Pełny tekst źródłaThis work studies the TeraHertz detection and generation thanks to plasma wave oscillation in AlGaN/GaN quantum well. After describing the nature of a plasma, we calculate the plasma resonant frequency and introduce the Dyakonov-Shur theory. For a more comprehensive purpose we introduce a simplified structure compared to microwave transistors, as a plasmonic wave guide. The aim of this structure is to study the interaction between the plasma wave and the electromagnetic one. We show in this report transmission measurement of this structure in THz regime thanks to a measurement set up based on a femtoseconde laser. This study shows that at room temperature, the plasma wave is over dumped which make them critical for measurement. The model developed in this work shows that plasma wave oscillation could be more easily characterized at 77K. Finally field effect transistors based on GaN nanowires have been processed. This study result of the collaboration between IEMN laboratory and Charles Lieber research group based at Harvard University. This work has demonstrated for the first time the potentiality of such a kind of nanowire for future applications. We show in this report how the transfer between growth substrate and the dedicated one for device processing has been handled. The aim of this work was to process transistors based on nanowires for microwave applications. The conclusion of this work shows that extrinsic parameters of those transistors are huge compared to nanowires intrinsic ones. Therefore an innovative deembedding method has been developed for intrinsic parameters extraction. We show 12 GHz maximum available gain cut-off frequency which makes this result as the state of the art
Cibie, Anthony. "Substrats innovants pour des composants de puissance à base de GaN". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI014/document.
Pełny tekst źródłaNew materials such as gallium nitride (GaN) emerge as promising candidates for power electronics. The current trend is to fabricate the AlGaN/GaN power devices directly on (111) silicon substrates. It makes the expitaxy of the GaN challenging and affects the device performances. In this work, we focus on substrate approaches to solve these problems. A transfer process was developed to replace the silicon substrate by another material to enhance electrical performances of the devices. Especially, GaN devices were transferred on copper substrates without electrical degradation. Electrical and thermal characterizations were performed to study the impact of the transfer. This work offers a first approach on the transfer of GaN devices from 8 or even 12 inches silicon substrates
Lachèze, Ludovic. "Etude et simulation physique des effets parasites dans les HEMTs AlGaN/GaN". Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13975/document.
Pełny tekst źródłaIII-V nitrides have attracted intense interest recently for applications in high-temperature, high-power electronic devices operating at microwave frequencies. Great progress has been made in recent years to improve the characteristics of nitride High Electron Mobility Transistors (HEMTs). However, it's necessary to study the mecanisms involved in the electron transport as the mechanic strain on the AlGaN layer, the fixed charge distribution and leakage currents. In this goal, from DC I-V measurements, pulsed I-V measurements and DCTS measurements, TCAD simulation are used to validate the assumption on the origin of the parasitic mechanisms on the electron transport. I-V measurement in temperature (from 100K to 200K) are used to identify the nature of mechanisms (Poole-Frenkel, band-to-band tunneling, thermionic,..). With this method, an accurate study of the gate current was done. To choose the different physical phenomena and which model to implement in the TCAD simulations, an analytical model was developed with a compraison with measurements. These mechanisms are validated by TCAD simulation. The comparaison between I-V measurements and simulation permit to localize (in the transistor) these parasitic mechanisms. In conclusion of this work, a high density of traps in a thin layer under the gate increase the probability of tunnelling current through the gate. When the gate bias increases, the high density of traps in AlGaN layer is using by electrons to leak by the gate. When the gate bias increases, the valence band in AlGaN layer is aligned with the conduction band in the channel. The very thin thickness of this layer (about 25nm) makes possible a band-to-band tunneling
Ziadé, Pierre. "Simulation de composants électroniques aux fréquences téraHertz". Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20104.
Pełny tekst źródłaThe objective of this thesis is the analysis of three-dimensional plasma oscillations in diodes based on InGaAs and GaN, materials of great interest for terahertz applications because of the high electron mobility of the first and the strong electron-optical phonons interactions in the second. This work falls within the context of recent studies in which the use of devices based on the excitation of three-dimensional plasma waves has been proposed for terahertz applications, at a time when two-dimensional plasma waves remain very limited in emission power. This study is conducted through the development of a numerical simulation based on the hydrodynamic model coupled to a one-dimensional Poisson solver. The response of diodes at different optical and electrical excitations is then evaluated through the description of small-signal regime, and the influence on plasma resonances of the various parameters of the diodes is demonstrated for InGaAs and GaN. A matrix resolution of the two-dimensional Poisson equation is also presented for a subsequent coupling with the two-dimensional hydrodynamic model, which would eventually allow a more thorough study of plasma waves in transistors. In addition, since the input parameters of the hydrodynamic model are derived from a Monte Carlo simulator whose input parameters are directly calculated from the band structure of the material, a preliminary study to devices simulation, which involves the calculation of the materials band structure by the semi-empirical pseudopotential method, is also considered
Liu, Xiaoshan. "Méthodologie d’Analyse de la CEM dans un Module de Puissance à Composants GaN". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN057/document.
Pełny tekst źródłaThanks to the material’s physical properties and the advancement in the engineering and manufacturing, power semiconductor devices based on Gallium Nitride (GaN) are promising candidates for high frequency, high efficiency and thus high power density power module design. However, GaN devices’ fast switching results in high slew rate in switching voltage (dV/dt) and current (dI/dt), combined with parasitic inductive (L) and capacitive (C) elements within the power module, gives rise to electromagnetic interference (EMI) noise in a wide frequency range. This dissertation is focused on the influence on EMI performance of the GaN based power module design and the optimization approaches.In order to study the aforementioned issues, an entire power module including the GaN power devices and the module’s packaging are to be characterized and modeled so that the EMI performances can be reconstructed by simulation with these models. The modeling methods of a commercial enhancement-mode (e-mode) GaN High-Electron-Mobility-Transistor (HEMT) and a lab-designed power module are discussed respectively in chapter I and II,• The device modeling involves the static part and the dynamic part, where the former is modeled to represent the forward I-V characteristics and the reverse diode-like conducting ones and the latter is modeled to represent the nonlinearly voltage dependent intrinsic capacitances between each pair of terminals. The modeling method is based on the characteristics extracted from datasheet and can be scaled to all e-mode GaN HEMT.• The packaging modeling involves mainly the extraction of the stray capacitances between the module and the heatsink and the parasitic inductances between the DC link capacitor and the power devices. The extractions are processed by both numerical calculation with software ANSYS Q3D and impedance measurement with a vector network analyzer E5061B. The results from these two approaches match well from one to the other.Once the full model of the GaN based power module is built, it is validated with experimental switching test where the simulated switching waveforms and the EMI noises are compared with the measured ones respectively in chapter III and IV. The test bench apart from the GaN power module is modeled to complete the full simulation model. The measurement precautions are presented as well.• The switching waveforms are obtained in double pulse and permanent switching tests and are compared to the simulated ones where they are correctly matched. The minimization of the switching voltage’s overshoot by using between DC+ and DC- the in-module capacitors CX is analyzed and finally the capacitor CX’s value is recommended in different situations.• The EMI noises are measured in terms of common mode (CM) and differential mode (DM) currents in the Line-Impedance-Stabilized-Network (LISN) and are compared with the simulated ones where they are correctly matched from 100 kHz up to 30MHz. The CM noise propagation paths from the power module and from the resistor-inductor load are analyzed. The effects of the in-module capacitors CX and the CM filter ones CY are studied. Finally the distribution of filter capacitors in different locations is studied by simulation
Leurquin, Camille. "Etude des mécanismes de dégradation et Fiabilité dynamique des composants GaN sur Si". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT025.
Pełny tekst źródłaTo contribute significantly to the global reduction of energy consumption, it is essential to develop electrical energy converters based on new power components, such as GaN on Si. These more compact and efficient components offer promising prospects. MOS-HEMT (MOS channel High Electron Mobility Transistor) power transistors based on GaN-on-Si, developed at CEA-Leti, target the market for low-voltage power converters (< 900 V). This architecture has demonstrated excellent performance in both static and dynamic aspects. However, temporal degradations under gate and drain stresses, as well as the degradation mechanisms, remain relatively unknown. The objective of this thesis is to explore the instabilities of the on-state resistance RON and threshold voltage VTH of these transistors, both during and after stresses of several hundred volts applied to the component's drain. This study was conducted using specially designed innovative electrical characterization techniques called HVBTI. A significant portion of the work focused on identifying the defects causing these deviations and understanding the underlying physical mechanisms involved in these degradations. The influence of epitaxial layers and architecture on the instability of VTH has been thoroughly investigated. While these studies have significantly enriched our understanding of GaN-on-Si transistors manufactured at CEA-Leti, the comprehension of RON and VTH instabilities still requires further exploration
Bryan, Charlotte. "Etude et développement de capteurs thermiques pour composants de puissance". Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI079.
Pełny tekst źródłaSince the start of the century, the demand for power components has risen sharply. Power components are used in integrated circuits for applications requiring high frequencies, of several GHz, and powers up to 100 W, mainly for mobile phones and chargers. Materials such as gallium nitride (GaN) and aluminium gallium nitride (AlGaN) have emerged in this field to create new power devices including power diodes and High Electron Mobility Transistors (HEMT), overcoming the limitations of silicon-based devices. HEMTs deliver high power and overheating can occur if they are not well managed, leading to the degradation of its cabling and packaging. Heat management in power circuits, as in electronic circuits in general, is a major issue. Diodes and sensors made from thermistant materials - materials with large variations in resistance as a function of temperature - are used to measure the HEMTs temperature, however, both of these require external currents to operate and use additional space in the device packaging.Thermoelectric sensors for power devices were therefore developed during this research; these sensors are based on the Seebeck effect, which directly converts heat into electrical energy. The output voltage of these thermoelectric sensors is directly proportional to the temperature difference along the sensor so no external energy is required. These sensors can measure a temperature difference and the heat flow can also be deduced. This work describes the first fabrication of such sensors.Two types of sensors were produced: the first is an on-chip sensor; it is fabricated at the same time as the HEMT transistor. This enables it to be placed as close as possible to the transistor for a more accurate temperature measurement. It is also directly integrated onto the HEMT chip so it does not take up additional space in the packaging, which implies that it must follow the same dimensioning and fabrication rules as the transistor. This sensor uses the 2D Electron Gas (2DEG) at the AlGaN and GaN’s interface for electrical transport.The second type of sensor is a stand-alone thermoelectric sensor designed to deliver higher electrical performance. It is fabricated independently, so has fewer constraints than the on-board sensors. Two stand-alone sensors were developed: one using the 2DEG and the other using an n-doped GaN. Their geometry was dimensioned using results from a study carried out beforehand on the contact resistances and on the thermoelectric properties of the two materials.Both types of sensors were tested and verified to be functional. Several geometries were fabricated for each type, and their sensitivities compared. The on-chip sensor was characterised while activating the adjacent transistor, which represents its intended function. The stand-alone sensors were characterised using metallic heat lines to their side. The measurements were taken at a number of different surrounding temperatures in each case. High sensitivities were obtained with these sensors: 350 mV / K for the on-board sensor and 14 V / K for the stand-alone sensor
Thevenot, Alexandre. "Réalisation de composants passifs à base de technologie AlGaN/GaN pour des applications millimétriques". Mémoire, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5428.
Pełny tekst źródłaHaffouz, Soufien. "Croissance optimisee de gan et al xga 1 xn pour l'elaboration de composants optoelectroniques". Nice, 1999. http://www.theses.fr/1999NICE5280.
Pełny tekst źródłaPace, Loris. "Caractérisation et modélisation de composants GaN pour la conception de convertisseurs statiques haute fréquence". Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I078.
Pełny tekst źródłaThe high frequency operation of GaN power transistors is of great interest in order to reduce size, weight and volume of power converters. Indeed, GaN HEMT power transistors show very good physical properties for the development of high frequency power converters. Within the constant rise of the amount of power electronics in electrical systems, the GaN technology, associated with the Silicon Carbide (SiC) one, aims to progressively replace the Silicium (Si) power devices especially in terms of robustness in harsh conditions and of power integration. The optimal design of high frequency power converters involves an accurate knowledge of power devices operations in the systems. Therefore, before the fabrication of converters, simulations steps based on semi-conductor and surrounding elements models are required. This research work focuses on the development of a modeling methodology of packaged GaN power transistors, exclusively based on non-intrusive characterization techniques. In this work, electrical characterization techniques used for radiofrequency transistors modeling, such as S-parameters and pulsed current/voltage measurements, are adapted to characterize the packaged GaN power transistor. Based on the characterization results, linear and nonlinear elements of the transistor’s electrical equivalent circuit are determined and a complet electrical model of the device is implemented in the ADS software. A Double Pulse test bench is made in order to apply the developed electrical model. After having modeled the whole test bench, including the printed circuit board, simulation results of the switching waveforms are compared to experimental results. Considering the effects of transistor’s temperature on its operation in power converters, a methodology is proposed to extract the thermal model of the device using dissipated power measurements and an optimization procedure. The obtained thermal circuit and its influence of thermal-dependent elements are added to the previous electrical model in order to build the complete electro-thermal model of the GaN power transistor. Based on the developed model, a DC to DC converter using the studied transistor has been designed and fabricated. Then, the simulation results are compared to experimental results for several operating temperatures and a prediction of the continuous operation of the converter is achieved
Huet, Frédérik. "Croissance et optimisation de composants à base de GaN sur saphir : LED bleues et transistors". Lille 1, 2000. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2000/50376-2000-99.pdf.
Pełny tekst źródłaMhedhbi, Sarra. "Développement de composants flexibles en technologie hétérogène (GaN et graphène) pour des applications hautes fréquences". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10158/document.
Pełny tekst źródłaIn recent years, the field of flexible electronics has been expanding. Many applications difficult to achieve by conventional electronics are targeted as RFID tags, mobile sensors, flexible screens… This field is essentially based on organic material for which the poor mobility (<1cm2 /V.s) limits considerably the device performances. In this context, the heterogeneous integration of GaN and graphene devices on a flexible substrate appears to be a promising solution for microwave power applications where conformability on a non-planar surface is needed. This work presents, on the one hand, a method to transfer AlGaN/GaN HEMTs onto flexible tape and, on the other hand, a technique for handling and manufacturing graphene-based components directly on the flexible substrate. HEMTs with short-gate length (LG = 100 nm) have been transferred onto flexible tape and showed state of the art results in terms of microwave power with a linear power gain (Gp) of 15.8 dB, an output power density (Pout) of 420 mW/ mm and an added power efficiency (PAE) of 29.6%. Concerning graphene-based devices, a flexible substrate handling technique has been developed making the manufacturing process more reliable. A cut-off frequency ft of 1 GHz and a maximum oscillation frequency fmax of 3 GHz were obtained
Nguyen, Van-Sang. "Conception caractérisation et mise en oeuvre d'un circuit intégré type driver en CMOS pour composants GaN". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT067/document.
Pełny tekst źródłaThis Ph.D work is part of the industrial academic project MEGaN (More Electric Gallium Nitride) involving many French companies (Renault, Schneider Electric, Safran, ID MOS, Valeo, ...), academic institutions (G2Elab, Ampere, SATIE ...) and CEA. MEGaN project aims are to introduce a new technology of the power components based on GaN materials, to increase the performance of the static converters for various applications.This research is highly focused on the integrated driver and other power device peripheral units for GaN-based components. This is done in SOI CMOS XFAB XT018 technology to promote performing in high-frequency and high temperature applications. It involves examining driver's architectures and features, innovative methods to limit problems inherent in high frequency and high temperature (conducted EMI perturbation, delay mismatch, functional limitations ...). After studying the architecture at the scale of the discrete circuits, the integrated circuits are designed in collaboration with the project partners. The integrated circuit is manufactured by foundry XFAB before being characterized and implemented.In particular, the characteristics at high frequency response and high temperature compliance are proposed. The final implementation is conducted in the hybrid power module power with the power components GaN, as close as possible to those for operation at high frequency which is presented in the end of this thesis. The final demonstrator serves several kinds of applications because of its versatility. The thesis is specifically focused on the study of high frequency behavior of the driver and power switches with high switching speed / the driver’s components of an inverter leg
Gassoumi, Malek. "Etude des défauts électriquement actifs dans les composants hyperfréquences de puissance dans les filières SiC et GaN". Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0029/these.pdf.
Pełny tekst źródłaThe increasing demanded of components allowing operating in strong power in high frequency and in high temperatures drove to the development of electronics system on semiconductors base to wide band gap such as the gallium nitride (GaN) and silicon carbide (SiC). However the performances are limited by the quality of the material (impurities, crystallographic defects). In this thesis, we are interested in the study of two devices: MESFETs 4H-SiC, HEMTs AlGaN/GaN/Si for hyperfrequency and power applications. The study of the output characteristics revals anomalies. For MESFETsH-SiC, hysteresis effect on drain/source conductance spectacular Kink effect and shift of voltage has been observed. The DLTS and CDLTS measurements demonstrate that these effects are principally due to the presence of deep centers in the structures. For HEMT AlGaN/GaN/Si, hysteresis effect, series resistance is observed. The CDLTS measurements with impulses on the drain demonstrate the presence of punctual traps by extended defects
Gassoumi, Malek Guillot Gérard Maaref Hassen. "Etude des défauts électriquement actifs dans les composants hyperfréquences de puissance dans les filières SiC et GaN". Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=gassoumi.
Pełny tekst źródłaThèse soutenue en co-tutelle. Titre provenant de l'écran-titre. Bibliogr. à la fin de chaque chapitre.
Delaine, Johan. "Alimentation haute fréquence à base de composants de puisance en Nitrure de Gallium". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT012/document.
Pełny tekst źródłaThis study consist in the development of a high frequency insulated DC/DC converter based on GaN power devices. The goal is to increase significantly the power density in comparison with actual converter solutions. This thesis evaluate the GaN components performances to determine the best working conditions. Once the critical points highlighted, gate circuit topologies suitable for EPC GaN HEMT are studied and an integrated IC is designed and implemented. The overall layout of the card has an important role in terms of integration and EMC optimization, so it is discussed and routing rules are proposed. Finally, we study several power structures and implement them to verify proper operation and their compliance with specifications
Herbecq, Nicolas. "Conception et réalisation de composants GaN innovants pour les applications de conversion de puissance au-delà du kilovolt". Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10152.
Pełny tekst źródłaGaN-based High Electron Mobility Transistors (HEMTs) on Silicon substrate (GaN-on-Si) are promising candidates for future generations of power converters. Today, technical limitations need to be overcome in order to allow the industrial commercialization of this technology, particularly for high-voltage applications (≥ 600 V). In this frame, this work constitutes a contribution to the development of innovative GaN-on-Si devices operating above 1kV. We mainly focused on the improvement of the blocking voltage of the transistors with the realization of a local substrate removal process with the aim of suppressing the parasitic conduction phenomena between the buffer layer and the substrate. Owing to an improved technological process and innovative epitaxial structures, we observed a drastic improvement of the electrical performances of the transistor under high voltages. In particular, we have been able to demonstrate for the first time a blocking voltage above 3kV for this emerging technology. These results, well beyond the state of the art, pave the way for higher voltage operation GaN-on-Si power devices
Fu, Jian zhi. "Mise en oeuvre de moyens de vieillissement accéléré et d'analyses dédiés aux composants de puissance grand gap". Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR075/document.
Pełny tekst źródłaThis thesis constitute one of the elements of the EMOCAVI research project (Evolution of the Large gAp Power Component Models during the VIeillissement). It deals with the study of the reliability of Gallium Nitride (GaN) power transistors which are recently appeared on the market. This work focuses on the realization of a methodology to parameterize the model of GaN GIT component (Gate Injection Transistor) according to the aging to which it has been subjected. To achieve this goal, it will be necessary to go through several steps. The first step was dedicated to the definition, implementation and validation of an aging bench for the component and the characterization of these components before and during aging. A low power repetitive short-circuit aging test bench was designed and implemented. This bench is used to validate the energy-related aging hypothesis, to identify its determining level from a point of view of the reliability of the component and finally to highlight the progressive degradation of the component in order to identify the parameters of the transistor which are the most sensitive to aging. The second step of our work was devoted to the establishment of a methodology to create the aging model for the GaN-GIT component. By reproducing the COBRA model presented in the literature, we have succeeded in our work in proposing an innovative approach to integrate the dependencies in temperature and energy suffered by the component during stress (the Tsc pulse duration and the number of pulse suffered Nsc). The last step of our work was dedicated to the physical failure analysis in order to confirm the hypothesis made on the degradation mechanisms obtained after aging of the component. To carry out these analyzes, we started with the de-capsulation of the component by combining the laser cutting with the chemical attacks of the resin constituting the packaging. Once the defect was localized by photoluminescence, an in-depth analysis by SEM scanning and then PFIB (Plasma Focused Ion Beam) scans was performed to determine the mechanism of failure. These were mainly cracks in the Al metal at the drain and the presence of cavities in the metal layer which is used to make the Ohmic contact at the source, which explains the increase in resistance RDSON
Hachem, Dany. "Méthodes et analyses physico-expérimentales des mécanismes liés à la résistance dynamique dans les composants HEMT GaN de puissance". Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30035.
Pełny tekst źródłaTo control the flow of electrical energy from source to load, power electronics is one of the key elements for the management of this energy. Managing and converting electrical energy requires efficient power converters, based on switches exhibiting high switching and conduction performance, at high power and high frequency. Although silicon-based devices have dominated power electronics for long time, the physical properties of this material limit the performance of these devices in terms of maximum operating temperature, breakdown voltage, dynamic On-state resistance and switching speed. The search for promising materials exhibiting superior performance compared to silicon is therefore contemplated. Gallium nitride (GaN) is one of the materials that, thanks to its physical properties, meet the manufacturing requirements of power converters. Furthermore, the AlGaN/GaN heterostructure high electronic mobility transistor (HEMT) is one a power device that contributes to the innovation in power conversion technologies. However, many reliability issues affect the electrical performance of these devices and require efforts of analysis and understanding. The contributions of this work fit precisely in this topic. The characterization of the dynamic On-state resistance of GaN HEMT transistors, which is a critical problem, is necessary to understand the dynamics of certain phenomena such as trapping. In this work, we focus on characterizing the effects of trapping induced by defects that may exist in the different layers of the structure. We propose a new general measurement methodology allowing reliable and reproducible results and showing the importance of mastering the initial conditions before each measurement. These dynamic phenomena are characterized using current measurements as a function of time, realized on TLM structures coming from different technological batches, under electrical and/or optical stimulations. Two characterization methods of these defects are proposed. The purpose of the first method is to stress the device by a negative voltage applied to the substrate to stimulate the defects located between the 2DEG channel and the substrate, while the second one consists in illuminating the device under test with a light source whose corresponding photon energy is chosen to affect only the traps present in the materials. The effect of the illumination on the contact resistances is then studied, showing a non-negligible contribution of these resistances in the total resistance and thus highlighting, for the first time, that the degradation of the dynamic on-state resistance may be due not only to phenomena in the 2DEG channel but also to phenomena at the ohmic contacts.[...]
Jouk, Martin. "Étude de la fabrication de nouveaux composants à base de Nitrure de Gallium (GaN) pour les applications de puissance". Nice, 2012. http://www.theses.fr/2012NICE4012.
Pełny tekst źródłaGallium Nitride wide bandgap (3. 4eV), low intrinsic carrier concentration, high electron saturation velocity and high electric breakdown field (3,3 MV/cm) makes this material very appealing for high power/high voltage applications. While high power Radio Frequency AlGaN/GaN HEMTs (High Electron Mobility Transistors) are already commercially available, high voltage switches made of Gallium Nitride have not been released yet. For high power/high voltage applications, vertical architecture has proven to be superior to lateral architectures due to an improved tradeoff between breakdown voltage and specific on-state resistance. The goal of this thesis is to develop the technological steps requires for the fabrication of a GaN vertical HEMT (High Electron Mobility Transistor). In this thesis, we demonstrate the growth of GaN structures with embedded Current Blocking Layers that are characterized by a smooth surface as required for obtaining a highly conductive 2D gas as the GaN/AlGaN interface. We also describe the realization of satisfying deep etches of GaN structures by Reactive Ion Etching. Finally, despite the non-uniformity of the selectively grown material, we have found selective growth parameters compatible with the fabrication and operation of the vertical GaN HEMT. The main hurdle remaining for the fabrication of vertical GaN HEMTs with high performances consists in obtaining Current Blocking Layers with improved characteristics
Jaud, Alexandre. "Croissance homo-épitaxiale VLS et étude du dopage au magnésium de GaN pour la protection périphérique de composants de puissance". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1181/document.
Pełny tekst źródłaFor peripheral protection of GaN power electronics devices, we have explored a new approach for performing localized homo-epitaxy of p-doped GaN, by implementing Vapor-Liquid-Solid (VLS) transport. The growth cycle includes three successive steps. At first, Ga is deposited onto the seed surface by MOCVD from TEG, resulting in an array of Ga droplets with submicrometric diameters. Then, Mg is incorporated into the droplets from the gas phase, using (MeCP)2Mg precursor. In the last step, Ga-Mg droplets are nitridated at 500-700°C in flowing ammonia diluted in a carrier gas.After one complete growth cycle, a network of well separated submicrometric GaN dots or ring-shaped features is systematically obtained. Increasing the Mg incorporation into the droplets drastically influences the growth mode, promoting a pure VLS growth mechanism, at the Liquid/Solid interface, versus growth at the triple line. Such GaN structures show a homo-epitaxial relationship with the seed, but a higher crystalline imperfection. Using a multi-cycles approach, GaN films could be obtained, with very high Mg concentrations tunable from 3.1019 to 8.1021 cm-3. Nevertheless, O, C and H impurities are also incorporated at high levels. Various approaches have been vainly investigated to try reducing O contamination level, prohibitive for obtaining p-type material. Actually, as-grown GaN:Mg films are n-type and highly conductive, for moderate Mg concentrations, and become semi-insulating at highest doping levels. Various masking materials have been tested for growth localization purpose
Videau, Nicolas. "Convertisseurs continu-continu non isolés à haut rapport de conversion pour piles à combustible et électrolyseurs - Apport des composants GaN". Phd thesis, Toulouse, INPT, 2014. http://oatao.univ-toulouse.fr/15740/7/Videau_2.pdf.
Pełny tekst źródłaVideau, Nicolas. "Convertisseurs continu-continu non isolés à haut rapport de conversion pour Piles à Combustible et Electrolyseurs - Apport des composants GaN". Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2014. http://tel.archives-ouvertes.fr/tel-00988205.
Pełny tekst źródłaBerthelot, Laurent. "Réalisation et caractérisation de composants luminescents à base de semiconducteurs organiques : Diodes à héterojonction PVK/Alq3 : Diodes hybrides GaN/Organique". Ecully, Ecole centrale de Lyon, 1999. http://www.theses.fr/1999ECDL0052.
Pełny tekst źródłaMinko, Auxence. "Technologie des composants de type HEMTs AlGaN/GaN sur substrat silicium pour des applications en amplification de puissance et faible bruit". Lille 1, 2004. http://www.theses.fr/2004LIL10109.
Pełny tekst źródłaBarranger, Damien. "Développement de transistor AlGaN/GaN E-mode sur substrat silicium 200 mm compatible avec une salle blanche CMOS". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI135.
Pełny tekst źródłaThis thesis focuses on the development of AlGaN/GaN heterojunction components or HEMT. This heterojunction has an excellent mobility (2000 cm² / V.s) thanks to the appearance of an electron gas in the GaN. However, the components made with this heterojunction are normally-on. For safety reasons particularly, normally-off components are required. There are many ways to make normally-off transistors based on AlGaN/GaN heterojunction. In this thesis we chose to study a MOSCHEMT strucutre. This structure is characterized by a MOS type gate and HEMT type accesses. The study shows the effects of technological parameters (epitaxy, process and component structure) on the electrical behaviour of the components. Another structure studied is the monolithic cascode, which can improve on-state performance of the MOSC-HEMT without damaging the characteristic in reverse of the components. The objective of this thesis is to design a normally-off component on silicon substrate 200 mm with a threshold voltage higher than 1V, able to hold 600 V in reverse, with a current rating between 10 A and 30 A and compatible in CMOS clean room. The manuscript has four chapters. Through a bibliographic review, the first chapter presents the different methods to obtain a normally-off transistor based on gallium nitride. This chapter presents and justifies the technological choice of CEA-LETI. The second chapter presents the models as well as the methods of characterizations used during the thesis. The third chapter deals with the results obtained by varying the manufacturing parameters on the MOSC-HEMTs. Finally, the fourth chapter shows a study on innovative cascode technology. This structure must make it possible to increase the breakdown voltage of the transistors without damaging the on state
Kabouche, Riad. "Caractérisations de composants et Conceptions de circuits à base d’une filière émergente AlN/GaN pour applications de puissance en gamme d’ondes millimétriques". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10200/document.
Pełny tekst źródłaGallium Nitride (GaN) technology is now the ideal candidate for high power applications in the millimeter wave range. The characteristics of this material enable high voltage operation at high frequency, as illustrated by its breakdown field and high electron saturation velocity. This research work has initially allowed the development of a test bench capable of "Large Signal" characterization, called LoadPull up to Q band, in continuous-wave and pulsed mode of this emerging technology. Indeed, the high power density generated by the GaN technology has made the development of this bench unavoidable and relatively unique. In addition, this study has focused on the characterization of several innovative types of devices that have demonstrated state-of-the-art performance, with a power added efficiency (PAE) above 46% associated to a power density of 4.5 W/mm obtained for an operating frequency of 40 GHz in continuous-wave. Finally, this work aimed the design and fabrication of two power amplifiers on silicon substrate (based on the industrial OMMIC technology) in the Ka-band, showing the possibility of achieving MMIC type circuits from advanced GaN transistors technology. These two amplifiers were designed for specific purposes: combining high power and high PAE performance and pushing bandwidth limits
Derkacz, Pawel. "Convertisseur GaN optimisé vis-à-vis de la CEM". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT067.
Pełny tekst źródłaThe thesis investigates the possibility of EMI mitigation for power electronic converters with GaN transistors in three key areas: control strategy, layout design, and integrated magnetic filter. Based on a Buck converter, the contribution of hard and soft switching to the generated conducted noise (Common Mode (CM) and Differential Mode (DM)) has been investigated. The positive effect of soft switching on EMI reduction in a specific frequency range was demonstrated. The impact of layout design attributes was also observed and the need to optimize it was highlighted. Next, a detailed study of the identification of parasitic elements in a single inverter leg is presented. Specific areas of concern were detailed and considered later in the thesis. The developed simulation workflow in Digital Twin used to study the impact of individual layout elements on EMC is presented. The laboratory test bench used for EMC measurements is also presented, together with a description of the necessary experimental precautions. Furthermore, the two key concepts implemented in the layout - shielding and Power-Chip-on-Chip (PCoC) - are presented. Their effectiveness in reducing EMI by almost 20~dB was confirmed by simulation and experiment. Finally, the Integrated Inductor concept is presented, which can be implemented together with the previous solutions. The effectiveness of a planar Integrated Inductor connected to the middle point of the bridge was demonstrated by simulation studies. The author's method for identifying the impedance of the Integrated Inductor and the key parasitic elements (in terms of EMC) has also been developed and presented in details. In conclusion, the work presents a series of solutions that significantly reduce EMI in GaN-based converters, which have been validated by simulation and experiment and can be applied to all types of power electronic converters
Duquenne, Cyril. "Procédés plasmas pour l'optimisation des matériaux intervenant dans le management thermique et la passivation de composants de puissance hyperfréquences à base de GaN et AlGaN". Phd thesis, Université de Nantes, 2008. http://tel.archives-ouvertes.fr/tel-00457286.
Pełny tekst źródłaDuquenne, Cyril. "Procédés plasmas pour l'optimisation des matériaux intervenant dans le management thermique et la passivation de composants de puissance hyperfréquences à base de GaN et A1GaN". Nantes, 2008. http://www.theses.fr/2008NANT2061.
Pełny tekst źródłaThis work is dedicated to the development and the optimization of a low temperature (<300°C) thin film deposition process. The targeted material is a nitride dielectric (AlN, BN) with a high thermal conductivity dedicated to the passivation of high power high frequency HEMT GaN devices. Nowadays, the GaN HEMT (High Electron Mobility Transistor) performances are directly limited by their thermal resistance. The integration of a dielectric material with a high thermal conductivity is expected to improve the thermal behavior of the device and to increase their performances. The magnetron sputtering has been chosen for its compatibility with microelectronic processes. This study addressed first an in depth study of magnetron sputtering deposition process for thin films (AlN and BN) and second a extended study of the physico chemical properties of the obtained thin films using XRD, FTIR, Raman spectroscopy, SAED and HRTEM. The magnetron sputtering process was study by Langmuir probe measurement and Optical Emission Spectroscopy. In the case of AlN films, we highlighted the first order effect of the magnetic field configuration on the film properties. Such a process control allowed obtaining an epitaxial growth of AlN films on AlGaN substrate at temperature below 250°C. The thermal properties of the thin films were investigated using an original electro-thermal measurement method well adapted to thin films. Such studies allowed underlining the relationship between thermal conductivity and thin film microstructure and to reach a further optimization of the thermal properties of AlN thin films up to 170 W. K-1. M-1
Mrad, Mrad. "Epitaxie de couches d'alliages quaternaires à base d'InAIGaN pour les transistors de haute performance". Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALY023.
Pełny tekst źródłaCEA is dedicated to working on Atomic and Alternative Energy, to advance clean technologies using science and technology. As part of these developments, CEA-LETI is developing high power transistors and low energy LEDs with several major companies. For high power transistors, the goal is to have components working at high voltage, and passing a current of up to 100A. The properties of GaN and its alloys are particularly appropriate for these components, when compared with the more traditional transistor materials such as silicon. Currently, GaN devices typically use a heteo-structure, with an AlGaN barrier grown on GaN layers. However, due to the difference in lattice parameter between these two materials, the device performance can be limited. In order to further improve the devices, in terms of performance and reliability, we have started to develop new barrier materials based on InAlN, which has the same lattice parameter as GaN. This PhD is a continuation of these initial developments, with the intention of adapting and developing these layers for specific applications, including the growth of quaternary films composed of InGaAlN
Abou, Daher Mahmoud. "Réalisation et optimisation de transistors HEMT GaN forte puissance et haute fréquence par technologie de transfert de couches sur substrat hôte". Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30046.
Pełny tekst źródłaWireless telecommunication market largely benefits from new nitride technologies, which reach outstanding performance compared with traditional technologies. Current research is opening up many new strategies and alternative solutions to address simultaneously antagonist considerations such as cost, performances and/or reliability. Most AlGaN / GaN HEMTs are fabricated on a low cost, highly resistive silicon substrate or on a much more expensive and supply sensitive SiC substrate. However, the electrical performance constraints required when these technologies are integrating into radar systems, satellites and in telecommunications systems make them dependent to the operating temperature parameter, mainly linked to the high power dissipation during static/dynamic energy transfer. Indeed, these components are capable of generating high power densities in the microwave range. However, the operating frequency increase leads an increase of the power dissipation, generating the self-heating phenomenon which influences the devices performance (ID,max,ft,fmax...). In this context, several solutions were already proposed in the literature (use of composite substrates, passivation of devices, etc.). Furthermore, the layer transfer technology to report HEMTs from growth substrate onto a host substrate with a good thermal conductivity (such as diamond substrate) is a promising solution, still poorly detailed to date. The objective of this thesis work is to improve the heat dissipation and thus the performance and reliability of high-frequency HEMT transistors by using a layer transfer technology. AlGaN / GaN heterostructures are grown on a silicon substrate by MOCVD at CHREA. After the fabrication of HEMTs on a silicon substrate, AlGaN / GaN devices (for which the silicon substrate has been removed) are transferred onto a CVD diamond substrate. This transfer is obtained by thermocompression bonding of sputtered AlN layers on each surface to be assembled (backside of the transistors and diamond substrate). This transfer process has not damaged the functionality of the transistors with short gate length (Lg = 80 nm). The AlGaN/GaN HEMTs with a 2x35 µm development transferred onto diamond of feature a current ID,max = 710 mA.mm-1, a cutoff frequency ft of 85GHz and an oscillation frequency fmax of 144GHz. However, this transfer technique requires optimization phases (especially to reduce thickness and improve the crystalline quality and thermal conductivity of AlN layers) in order to reduce the thermal resistance of this adhesion layer and to limit the self-heating phenomenon noted at the end of this thesis work
Meyer, Sandra de. "Etude d'une nouvelle filière de composants HEMTs sur technologie nitrure de gallium : Conception d'une architecture flip-chip d'amplificateur distribué de puissance à très large bande". Limoges, 2005. http://aurore.unilim.fr/theses/nxfile/default/c6724388-69b6-4017-a9a5-6408d2282ef8/blobholder:0/2005LIMO0030.pdf.
Pełny tekst źródłaThis work deals with the characterization of GaN HEMTs for RF power applications. In a first step, the properties of wide band-gap materials, and especially the GaN material, are analyzed in order to highlight their capabilities for wide band power amplifiers application. Results on characterization and linear/non-linear electrical and electromagnetic simulations, is exposed and applied to analyze different topologies and mountings of GaN HEMTs. This work is finalized with the design of wide band power amplifiers, showing a distributed architecture of cascode cells using GaN HEMTs and flip-chip mounted onto an AlN substrate. It appears as the first step toward GaN MMIC designs as capacitors and resistors are implemented on the GaN die. One version allows obtaining 10W over a 4 to 18GHz bandwidth, with an associated PAE of 20% at 2dB compression input power
Tartarin, Jean-Guy. "LE BRUIT DE FOND ÉLECTRIQUE DANS LES COMPOSANTS ACTIFS, CIRCUITS ET SYSTÈMES DES HAUTES FRÉQUENCES : DES CAUSES VERS LES EFFETS". Habilitation à diriger des recherches, Université Paul Sabatier - Toulouse III, 2009. http://tel.archives-ouvertes.fr/tel-00539034.
Pełny tekst źródłaRennane, Abdelali. "Caractérisation et modélisation du bruit basse fréquence des composants bipolaires et à effet de champ pour applications micro-ondes". Toulouse 3, 2004. http://www.theses.fr/2004TOU30236.
Pełny tekst źródłaThis thesis deals mainly with electrical noise in microwave silicon germanium (SiGe) and gallium nitride (GaN) field effect transistors (HEMT’s) and SiGe heterojunction bipolar transistors (HBT’s). The organisation of this memory is as follows, in first chapter, we remember the important properties of excess noise sources encountered in these type devices. In addition, we describe the measurement set-ups used for static and noise characterization. In the second and third chapters, a thoroughful analysis of the noise dependence on frequency, bias, and geometry of both SiGe and GaN HEMT’s, has been carried out, specifically, the input and output current noise sources respectively iG and iD and their correlation. This in combination with static characterization, allowed to identify the different noise sources present in these devices and their supposed origin. .
Beye, Mamadou Lamine. "Etude et contribution à l’optimisation de la commande des HEMTs GaN". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI102.
Pełny tekst źródłaThis thesis is part of the sustainable development context where the energy challenges rely on designing numerous and lumped power converters with good power density and high efficiency. New power semiconductor devices, namely wide band semiconductors (GaN, SiC) are used in designing the converters. The high frequency control of these converters makes the system more sensitive to parasitic elements. The latter elements disrupt the switching behavior of the transistors and generate additional losses. In this context this work was carried out in a cotutelle partnership between Ampère Laboratory in Villeurbanne and LN2 laboratory at the University of Sherbrooke; the aim being to make a contribution in optimizing the switching conditions of GaN HEMTs. The first work axis consists in managing the voltage and current switching speed through gate control strategies in order to improve the conducted EMI. Firstly, most of the proposed control circuits are developed in open-loop and then secondly in closed-loop in order to compensate the effects of non-linearities (with respect to temperature, load current and operating voltage). Concerning the development of control systems, it can be done first by the use of available discrete components, then by the alternative of the monolithic GaN integration which is considered in order to bring more speed and efficiency. Monolithic integration would also solve the problem of parasitic inductances. To facilitate the design of integrated circuits and control systems, the development of a behavioral model of HEMT GaN will serve as a modeling tool. The second axis of the work consists in experimentally validating well-adapted control system for the gate of the power transistor in order to master the transient behaviors of the power transistors. Namely it is necessary to allow a satisfying management of losses during dead time in a half bridge converter. At the end of this work, the control systems developed in open loop made it possible to slow the switching speeds by at least 30 % but causing an increase in switching losses up to 50% in some cases. Due to the fast switching speed of HEMT GaNs and the limitations of discrete components on the market, the reduction rate of switching speeds obtained with the closed loop (reduction rate less than 20%) is less attractive than that of the open loop. Using a monolithic circuit can be an alternative to increase the rate of reduction of closed loop switching speeds. SPICE simulation toward monolithic circuit are the basis of this hypothesis. Concerning the second axis, the application of multilevel gate voltage control of the transistors of half bridge made it possible to reduce the losses of reverse conduction and the losses due to the phenomena of Cross Talk by at least by 30 %
Ayari, Lotfi. "Contribution au développement d’un banc de mesures temporelles 4-canaux pour la caractérisation avancée de composants et de sous-systèmes RF non linéaires". Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0117/document.
Pełny tekst źródłaThe future communications for civil and military applications will use complex wideband modulated signals to be transmitted through multi-channel DOHERTY power amplifiers which should have high performance in terms of power, efficiency, OBO, and bandwidth. In order to meet these stringent requirements, designers need time-domain characterization tools for calibrated measurements and for optimizing voltages and currents at both ports of non-linear connectorized or on-wafer devices. This work successfully implements time-domain characterization tools used to meet specific needs for transistor modeling, to optimize their operation in terms of pulse to pulse stability, and to search optimal conditions of their operation modes in a Doherty power amplifier. For this implementation, mathematical modeling is performed to evaluate sampler’s performances in terms of time-domain sampling efficiency in order to choose the best suited sampling architecture for RF time-domain measurements. Rigorous calibration procedures have been developed to obtain simultaneously full time-domain calibrated waveforms (from low Frequencies to Microwave frequencies)
Lancry, Ophélie. "Etude par microspectrométrie Raman de matériaux et de composants microélectroniques à base de semi-conducteurs III-V grand gap". Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2009. http://tel.archives-ouvertes.fr/tel-00460102.
Pełny tekst źródłaRENNANE, Abdelali. "Caracterisation et modelisation du bruit basse frequence des composants bipolaires et a effet de champ pour applications micro-ondes". Phd thesis, Université Paul Sabatier - Toulouse III, 2004. http://tel.archives-ouvertes.fr/tel-00009299.
Pełny tekst źródłaMartin, Audrey. "Etude d'une nouvelle filière de composants sur technologie nitrure de gallium. Conception et réalisation d'amplificateurs distribués de puissance large bande à cellules cascodes en montage flip-chip et technologie MMIC". Phd thesis, Université de Limoges, 2007. http://tel.archives-ouvertes.fr/tel-00271472.
Pełny tekst źródłaSubramani, Nandha kumar. "Physics-based TCAD device simulations and measurements of GaN HEMT technology for RF power amplifier applications". Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0084/document.
Pełny tekst źródłaGaN High Electron Mobility Transistors (HEMTs) have demonstrated their capabilities to be an excellent candidate for high power microwave and mm-wave applications. However, the presence of traps in the device structure significantly degrades the device performance and also detriments the device reliability. Moreover, the origin of these traps and their physical location remains unclear till today. A part of the research work carried out in this thesis is focused on characterizing the traps existing in the GaN/AlGaN/GaN HEMT devices using LF S-parameter measurements, LF noise measurements and drain-lag characterization. Furthermore, we have used TCAD-based physical device simulations in order to identify the physically confirm the location of traps in the device. Moreover, our experimental characterization and simulation study suggest that LF measurements could be an effective tool for characterizing the traps existing in the GaN buffer whereas gate-lag characterization could be more useful to characterize the AlGaN barrier traps of GaN HEMT devices. The second aspect of this research work is focused on characterizing the AlN/GaN/AlGaN HEMT devices grown on Si and SiC substrate. We attempt to characterize the temperature-dependent on-resistance (RON) extraction of these devices using on-wafer measurements and TCAD-based physical simulations. Furthermore, we have proposed a simplified methodology to extract the temperature and bias-dependent channel sheet resistance (Rsh) and parasitic series contact resistance (Rse) of AlN/GaN HEMT devices. Further, we have made a comprehensive evaluation of thermal behavior of these devices using on-wafer measurements and TCAD-based three-dimensional (3D) thermal simulations. The thermal resistance (RTH) has been extracted for various geometries of the device using measurements and validated using TCAD-thermal simulations
Salomon, Damien. "Croissance, propriétés optiques et intégration d'hétérostructures radiales InGaN/GaN autour de fils auto-assemblés de GaN crûs sur saphir et silicium". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENY052.
Pełny tekst źródłaThis work reports on the realization by metal organic vapor phase epitaxy of visible light emitting diodes based on GaN wires grown on Si(111) with a focus on understanding the wires growth mechanisms and the properties of InGaN/GaN core/shell heterostructures grown around them. First we report the MOVPE growth of –c oriented GaN wires on sapphire. We demonstrate that the injection of silane during the growth induces the formation of a SiNx passivation layer around the GaN wires, preventing the lateral expansion. The silane flow can be stopped after a certain time without modifying the wire geometry. This phenomenon is used to control the position of the InGaN/GaN multiple quantum well shells along the wires. The wire growth on sapphire has then been transferred to silicon substrate thanks to the deposition of a thin AlN buffer layer prior to the wire growth. The deposition of InGaN/GaN core/shell heterostructures on the non-polar m-plane side facets of the wires and the influence of different growth parameters on the light emission properties of the quantum wells are then studied. Several types of quantum wells grown on different facets of the wire surface are observed. These different families emit light at different wavelengths that have been indexed thanks to cathodoluminescence mapping. The indium concentration in the quantum wells deposited is estimated between 8 and 24 %, depending on the growth conditions. This estimation has been made by comparing the emission wavelength of the quantum well to the recombination energy of electrons and wells simulated using the 8x8 band k.p theory for electron and hole masses. Finally, complete LED structures have been deposited on GaN wires by MOVPE and blue electroluminescence at 450 nm has been measured on single wires and assemblies of wires on Si(111)
Maulion, Geoffrey. "Conception, fabrication et caractérisation de composants photoniques innovants appliqués à la détection de gaz". Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS063/document.
Pełny tekst źródłaFor about a decade, gas detection has known a tremendous interest, due to several reasons: environmental issues, public health, people and building safety, etc... This trend, triggered a spectacular and sustainable need of gas detection means improvement and development, which has grown with both standards sophistication and scope extension. As a matter of fact, the number of research projects related to this particular topic increased: PEPS ANR project, begun in 2010, is one of them. This research project, which is the acronym of Pellet Photonique Sensor, aim at developing a photonic multigas detection system based on thermo-optical effect, thanks to the combination of on one hand, catalitic nanopowders which react selectively with the target gas (hydrogen or carbon monoxide) and on the other hand, an high sensitive to refractive index variations planar photonic component. This thesis manuscript mostly treats of the photonic component design (choice and optimization)
Brandelero, Julio Cezar. "Conception et réalisation d'un convertisseur multicellulaire DC/DC isolé pour application aéronautique". Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14246/1/Brandelero.pdf.
Pełny tekst źródłaCordier, Yvon. "Elaboration d'hétérostructures (Al,Ga)N/GaN en vue d'applications électroniques : de la croissance cristalline au composant". Habilitation à diriger des recherches, Université de Nice Sophia-Antipolis, 2007. http://tel.archives-ouvertes.fr/tel-00588722.
Pełny tekst źródłaChikhaoui, Walf. "Etude des mécanismes physiques responsables des dysfonctionnements des transistors HEMTs à base d'hétérostructures AlGaN/GaN et AlInN/GaN". Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00679527.
Pełny tekst źródłaBrull, Stéphane. "Etude cinétique d'un gaz à plusieurs composantes". Aix-Marseille 1, 2006. http://www.theses.fr/2006AIX11018.
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