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Literatura científica selecionada sobre o tema "Matériau diélectrique à haute permittivité"
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Teses / dissertações sobre o assunto "Matériau diélectrique à haute permittivité"
Baudot, Sylvain. "Elaboration et caractérisation des grilles métalliques pour les technologiesCMOS 32 / 28 nm à base de diélectrique haute permittivité". Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENT122/document.
Texto completo da fonteThis thesis is about the manufacturing and the characterization of TiN, aluminum and lanthanum metal gate for high-k based 32/28nm CMOS technologies. The effect of metal gate layer thickness and composition has been characterized on 32/28nm technology parameters. These results have been related to a change in the TiN vacuum work function, to Al- and La- induced dipoles at the HfSiON/SiON interface or their lowering on thin SiON (roll-off). We have shown that metallic aluminum introduced in the TiN metal gate causes a work function lowering, opposed to the weak Al-induced dipole. We have evaluated the roll-off influence for theses different metals. For the first time we report the strong roll-off dependence with the deposited lanthanum thickness. Newly developed TiN, Al, La deposition processes have brought benefits for the CMOS 32/28nm technology
Aulagner, Emmanuel. "Elaboration et étude des propriétés diélectriques de films minces de polyfluorure de vinylidène et de polypropylène chargés d'une céramique à haute permittivité relative". Saint-Etienne, 1996. http://www.theses.fr/1996STET4002.
Texto completo da fonteDi, Geronimo Camacho Elizabeth Carolina. "Synthesis, high-pressure study and dielectric characterization of two lead-free perovskite materials : SrTi1-xZrxO3 and KNb1-xTaxO3". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT208/document.
Texto completo da fontePerovskite materials whose general chemical formula is ABO3 are one of the most study ferroelectrics due to the interesting properties that they have for technological applications. However, their properties are directly related to structural phase transitions that could depend of temperature, composition and pressure. In the studies presented here, we first examined the high-pressure behavior of two perovskite materials SrTi1-xZrxO3 (STZ) and KNb1-XTaXO3 (KNT), and we later continued to investigate different sintering techniques in order to improve the densification, dielectric and ferroelectric properties of K(Nb0.40Ta0.60)O3 and (KxNa1-x)Nb0.6Ta0.4O3 ceramics.High-pressure Raman scattering and X-ray diffraction investigations of SrTi1-xZrxO3 (x= 0.3, 0.4, 0.5, 0.6, 0.7) and KNb1-XTaXO3 (x=0.4, 0.5, 0.6, 0.9) powders were conducted in diamond anvil cells. Raman scattering experiments showed and increased of Raman modes with pressure for the STZ samples, which indicates that pressure induced phase transitions towards lower symmetry for these compounds.Moreover, high pressure Raman spectroscopy experiments showed a decrease of the Raman modes as the pressure was increased for the KNT samples, showing that pressure induced phase transitions towards higher symmetries. The evolution of the main Raman modes for the orthorhombic and tetragonal phases were followed until the cubic phase was reach, and allowed us to propose a pressure-composition phase diagram for the KNT compounds.Three different sintering techniques, sintered aids, two step sintering and spark plasma sintering, were used on K(Nb0.4Ta0.6)O3 and (KxNa1-x)Nb0.6Ta0.4O3 ceramics. The use of KF as sintered aid and the two step sintering method showed an improvement of the dielectric constant and dielectric losses of these samples. SPS samples presented a fine microstructure with the highest density and the best ferroelectric behavior. We did not detect any changes on the Curie temperature due the amount of Na but and increase of the dielectric constant and the ferroelectric properties was observed due to the amount of Na
Ihara, Kou. "Οptimizing οf metal-insulatοr-metal capacitοrs perfοrmances by atοmic layer depοsitiοn : advancing prοductiοn efficiency and thrοughput". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC218.
Texto completo da fonteAs semiconductor technology progresses, the need to overcome the limitations of shrinking device sizes is considered paramount. While Moore’s law has guided this evolution over the past five decades, the constraints of the active components are now obvious as manufacturing processes approach the atomic scale. More Than Moore's approach has emerged to address this, emphasizing the integration and miniaturization of heterogeneous chips to enable the stacking of diverse system functionalities. However, integrating passive components poses significant challenges due to their production via disparate processes. Addressing this challenge, Murata Integrated Passive Solutions invented the Passive Integrated Connecting Substrate (PICS) technology, facilitating the integration of silicon-based passive components into 3D structures. The latest iteration, PICS5, leverages an anodic aluminum oxide template and Metal-Insulator-Metal stack deposition via atomic layer deposition. This thesis contributed to the ongoing refinement of PICS5 technology by enhancing the properties of 3D capacitors and exploring the potential of high-k dielectric materials (Nb2O5). This research aimed to optimize component performance and anticipate future challenges in semiconductor innovation by clarifying the nuances of thin film deposition processes and ALD equipment conditions
Lacrevaz, Thierry. "Caractérisation hyperfréquences de matériaux isolants de haute permittivité en vue de l'intégration de fonctions passives dans les circuits intégrés avancés". Chambéry, 2005. http://www.theses.fr/2005CHAMS036.
Texto completo da fonteTo improve the performances of the high-speed integrated circuits, integration density, speed and reliability, high permittivity insulators are progressively introduced in the design of Metal-Insulator-Metal (MIM) to increase the capacitance density and then to reduce their sizes. Many dielectrics such as Si3N4, Ta2O5, HfO2 or STO seem to be appropriated according to their characteristics at low frequencies. However, the complex permittivity εr (real permittivity εr ' and loses εr ") of insulators can vary with frequency : relaxation and resonance phenomenon can appear as the theory predicts. Then it is necessary to analyze the behavior of these materials on a large spectrum in order to select the dielectric which is the most stable in frequency before developing technological processes necessary to its integration. We propose a characterization method able to analyze the performances of these new insulators, deposited in planar layers, on a large frequency range (from 40 MHz to 40 GHz) before integrating them within a technological line. The in situ characterization technique that is used is based on a test structure that integrates the material to characterize in its manufacturing environment under a coplanar wave guide (CPW). This one then allows the large wave frequency study of the complex permittivity of the High-K material
Delhaye, Gabriel. "Oxydes cristallins à haute permittivité diélectrique épitaxiés sur silicium : SrO et SrTiO3". Ecully, Ecole centrale de Lyon, 2006. http://bibli.ec-lyon.fr/exl-doc/gdelhaye.pdf.
Texto completo da fonteThe study of the epitaxial crystalline oxide growth on silicon is of great interest for the future CMOS technologies or monolithic integration on silicon : the miniaturization of the micro-electronic devices leads to the replacement of the SiO2 gate oxide by crystalline oxides with high dielectric permittivity. The control of the crystalline oxide growth must also allow integration of functional oxide on silicon with ferroelectric, magnetic or optical properties, thus opening the way with the development of new devices. The studies undertaken in this work are related to the growth of crystalline oxides on silicon at low temperatures with molecular beam epitaxy and the development of strategies of suitable interface engineering. The deposited materials were on the one hand the rare earth oxides such as SrO, Ba×Sr1-×O and the other hand, oxides of perovskite type such as SrTiO3, BaTiO3 or LaAIO3. A first step has consisted in defining and optimizing the conditions of homo-epitaxy and hetero-epitaxy of oxide on oxide, for the systems SrO/SrTiO3, SrTiO3/SrTiO, BaTi3/SrTiO3 and LaAlO3/SrTiO3. The feasibility to realise crystalline oxide hetero-structures was thus studied from the point of view of functional oxide integration on semiconducteur. In a second step, we achived to control the crystalline oxide epitaxy on silicon, by studying more particularly the systems SrO/Si and SrTiO3/Si : strontium oxide can be grown at ambient temperature with formation of an abrupt interface, without silica to the interface. At a higher temperature of 500°C, depositing some mono-layers of SrO leads on the other hand to the formation of a mono-crystalline silicate of composition close to Sr2SiO4. However, the interface strontium silicate/Si has a poor thermodynamic stability, due to interfacial reactions during annealings at high temperature. We also developed a strategy of epitaxial growth of SrTiO3 on silicon based on the succession of various steps : an engineering of interface with formation of a strontium silicide, a recrystallization at low temperature of some mono-layers of SrTiO3 and the subsequent epitaxy at higher temperature. Thus, we observe the formation of a layer of good crystalline quality, without being able to avoid the formation of an amorphous silicate interfacial layer of ~1nm. The use of buffer layers of SrO or SrTiO3 on silicon allows the subsquent epitaxy of the LaALlO3 perovskite, of which the direct epitaxy on silicon could not have been obtained. The whole of the results so obtained makes it possible to consider the development of process of integration of new functionalities on silicon and the realization of new devices for micro-electronics
Boussatour, Ghizlane. "Caractérisation diélectrique et thermique de films biopolymères pour l’électronique flexible haute fréquence". Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I015/document.
Texto completo da fonteBiopolymer materials attract significant attention in many fields where they tend to replace petrosourced polymers. Thanks to their properties, such as biocompatibility, biodegradability, flexibility and lightness, biopolmyers are also increasingly used in many electronic applications. Nevertheless, their possible integration into high-frequency electronics requires the study of important properties such as thermal conductivity and dielectric complex permittivity. In this work we are interested in two biopolymers in particular, poly lactic acid (PLA) and cellulose palmitate (CP). The extraction of the properties of these materials is carried out through the implementation of two methods. The means selected are the 3ω method for the thermal conductivity and the two-line method for the dielectric complex permittivity. This latter is measured in the frequency band 0.5 - 67 GHz. These two characterization techniques require the realization of metal lines on the surface of the biopolymer films. Since biopolymers are not compatible with classical photolithography method, an alternative processes have been developed to meet this technological challenge. This experimental work is accompanied by modeling studies on both aspects, estimates of the thermal conductivity and the complex dielectric permittivity of the investigated materials. The comparison of the proposed analytical and numerical models with the experimental data shows a good understanding of the problem of characterization of these biopolymers
Charbonnier, Matthieu. "Etude du travail de sortie pour les empilements nanométriques diélectrique haute permittivité / grille métallique". Grenoble INPG, 2010. http://www.theses.fr/2010INPG0016.
Texto completo da fonteIn this PhD report, we study the variations of the effective metal work function in High-k metal gate devices. To perform this analyse, we have firstly studied and developed electrical characterisation techniques and especially the analyse of the capacitive response of MOS structure and the measurement of the internal photo-emission current. These methods have allowed us isolating the different components influencing the effective metal gate work function. Using these methods, we have demonstrated that these variation mostly originate from a dipole at the High-k / SiO2 interface. Moreover, we have evidenced a reduction of effective work function for P type metal gates. This phenomenon also originate from a dipole at the same interface. Finally, we have studied the influence of fabrication processes on this dipole and, more genarally, on the effective metal gate work function
Fuinel, Cécile. "Étude des potentialités de la transduction diélectrique de haute permittivité pour les résonateurs NEMS et MEMS". Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30302/document.
Texto completo da fonteSince two decades now, microscopic electronic devices including moving parts, called MicroElectroMechanical Systems (MEMS) have had a growing impact on industry and daily lives. Their range of application is already wide: from actuators (inkjet print heads, digital cinema projectors, etc.) to mechanical sensors (microphones, accelerometers, etc.). There is a growing research effort in the biosensing field as well. One of the main challenges for this application is to integrate a miniaturized and robust element to a vibrating beam-like structure, in order to achieve electromechanical actuation and detection, i.e. to convert an electrical signal into vibration and vice versa. In this work, we studied the integration of three dielectric materials on silicon microcantilevers, and successfully demonstrated the feasibility of simultaneous flexural actuation and detection of the structures by mean of dielectric transduction. Those results are one step forward the elaboration of mature detection systems
Djebara, Lotfi. "Concept, réalisation et étude d'un matériau composite intégrable au procédé de fabrication des condensateurs de haute performance". Nantes, 2006. http://www.theses.fr/2006NANT2010.
Texto completo da fonteLes exigences des circuits imposent aux condensateurs au tantale d'avoir de faibles valeurs de résistance série équivalente (RSE). Ce travail vise à remplacer le MnO2, matériau peu conducteur utilisé comme cathode par un polymère suffisamment stable et dopé. D'abord, nous avons mis en évidence le rôle du recuit dans la stabilisation du Ta2O5 et le rôle des éléments chimiques incorporés dans le renforcement de sa rigidité diélectrique. Nous avons montré que la stabilité et la bonne conductivité électrique du polymère PEDT conviennent à son utilisation comme cathode. Durant la réalisation des condensateurs, nous avons testé les procédés pour optimiser le remplissage des anodes de tantale avec la solution polymère. Finalement, les tests électriques montrent une capacité stable sur une large gamme de fréquence et des valeurs de RSE inférieurs à celles des condensateurs conventionnels. Les paramètres électriques restent stables pendant 1000 h ce qui assure la validité de nos résultats