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Letteratura scientifica selezionata sul tema "Active semiconductors"

Autore: Grafiati

Pubblicato: 19 ottobre 2024

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Articoli di riviste sul tema "Active semiconductors"

Wang, Xuejiao, Erjin Zhang, Huimin Shi, Yufeng Tao e Xudong Ren. "Semiconductor-based surface enhanced Raman scattering (SERS): from active materials to performance improvement". Analyst 147, n. 7 (2022): 1257–72. http://dx.doi.org/10.1039/d1an02165f.

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We review the recent progress in semiconductor-based SERS. We mainly discuss the enhancement mechanism, SERS-active materials for semiconductors, and potential strategies to improve the SERS performance.

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Cui, Can, Junqing Ma, Kai Chen, Xinjie Wang, Tao Sun, Qingpu Wang, Xijian Zhang e Yifei Zhang. "Active and Programmable Metasurfaces with Semiconductor Materials and Devices". Crystals 13, n. 2 (6 febbraio 2023): 279. http://dx.doi.org/10.3390/cryst13020279.

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Active metasurfaces provide promising tunabilities to artificial meta−atoms with unnatural optical properties and have found important applications in dynamic cloaking, reconfigurable intelligent surfaces, etc. As the development of semiconductor technologies, electrically controlled metasurfaces with semiconductor materials and devices have become the most promising candidate for the dynamic and programmable applications due to the large modulation range, compact footprint, pixel−control capability, and small switching time. Here, a technical review of active and programmable metasurfaces is given in terms of semiconductors, which consists of metasurfaces with diodes, transistors, and newly rising semiconductor materials. Physical models, equivalent circuits, recent advances, and development trends are discussed collectively and critically. This review represents a broad introduction for readers just entering this interesting field and provides perspective and depth for those well−established.

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DUTA, ANCA, CRISTINA BOGATU, IOANA TISMANAR, DANA PERNIU e MARIA COVEI. "VIS-ACTIVE PHOTOCATALYTIC COMPOSITES FOR ADVANCED WASTEWATER TREATEMENT". Journal of Engineering Sciences and Innovation 5, n. 3 (15 settembre 2020): 247–52. http://dx.doi.org/10.56958/jesi.2020.5.3.5.

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Advanced wastewater treatment targeting water reuse is currently an important research topic and the heterogeneous photocatalysis processes represent potential candidates. Most of the photocatalysts are aqueously stable metal oxides as TiO2 or ZnO; however, their use is limited due to the processes costs as these oxides are wide bandgap semiconductors that are activated only by UV radiation. Many alternatives are investigated to develop VIS- or solar-active photocatalysts among which most effective proved to be the diode type composites that associate the n-type semiconductor (TiO2) with a p-type semiconductor with lower band gap as CZTS or CIS. The challenges raised in developing thin films photocatalysts of diode type are discussed considering the advanced treatment under VIS and simulated solar radiation of a wastewater polluted with methylene blue (standard pollutant). Further on, new composites of TiO2 – Graphene oxide are presented considering the same application

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Nguyen, Thien-Phap, Cédric Renaud e Chun-Hao Huang. "Electrically Active Defects in Organic Semiconductors". Journal of the Korean Physical Society 52, n. 5 (15 maggio 2008): 1550–53. http://dx.doi.org/10.3938/jkps.52.1550.

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Friend, R. H. "Conjugated polymers. New materials for optoelectronic devices". Pure and Applied Chemistry 73, n. 3 (1 gennaio 2001): 425–30. http://dx.doi.org/10.1351/pac200173030425.

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Conjugated polymers now provide a class of processible, film-forming semiconductors and metals. We have worked on the development of the semiconductor physics of these materials by using them as the active components in a range of semiconductor devices. Polymer light-emitting diodes show particular promise, and recent developments in color range (red, green, and blue), efficiency (above 20 lumen/W for green emitters), and operating lifetime are discussed. Progress on their application to displays, with integration with active-matrix TFT drive, and with patterned deposition using inkjet printing techniques is also reviewed. The role played by interfaces between electrode and semiconducting polymer is also discussed.

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Sharma, Shweta, Rakshit Ameta, R. K. Malkani e Suresh Ameta. "Photocatalytic degradation of rose Bengal by semiconducting zinc sulphide used as a photocatalyst". Journal of the Serbian Chemical Society 78, n. 6 (2013): 897–905. http://dx.doi.org/10.2298/jsc120716141s.

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Various semiconductors have been used as photocatalysts for removal of different dyes from their aqueous solutions. Zinc sulphide semiconductor is used in the present investigation as a photocatalyst for the removal of rose Bengal dye. Effect of different parameters, which affect the rate of reaction; like pH, concentration of dye, amount of semiconductor and light intensity have been studied. A mechanism has also been proposed in which hydroxyl radicals are shown as an active oxidizing species.

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Forrest, S. R. "Active optoelectronics using thin-film organic semiconductors". IEEE Journal of Selected Topics in Quantum Electronics 6, n. 6 (novembre 2000): 1072–83. http://dx.doi.org/10.1109/2944.902156.

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Kamiya, Toshio, e Masashi Kawasaki. "ZnO-Based Semiconductors as Building Blocks for Active Devices". MRS Bulletin 33, n. 11 (novembre 2008): 1061–66. http://dx.doi.org/10.1557/mrs2008.226.

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AbstractThis article provides a review of materials and devices of wide-bandgap oxide semiconductors based on ZnO, highlighting the nature of the chemical bond. The electronic structures of these materials are very different from those of conventional covalently bonded semiconductors, owing to the ionic nature of the chemical bonds. Therefore, one needs to design and optimize fabrication processes and structures of active devices containing such materials, taking into account the peculiar defect formation mechanisms. A variety of active devices that have clear advantages over the conventional ones have been demonstrated, for example, ultraviolet light-emitting diodes, quantum Hall devices, and transparent and flexible thin-film transistors with high electron mobility, paving the way for future applications. The reasons behind the successes identify future challenges in research on oxide semiconductors.

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Fortunato, Elvira, Alexandra Gonçalves, António Marques, Ana Pimentel, Pedro Barquinha, Hugo Águas, Luís Pereira et al. "Multifunctional Thin Film Zinc Oxide Semiconductors: Application to Electronic Devices". Materials Science Forum 514-516 (maggio 2006): 3–7. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.3.

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In this paper we report some of the recent advances in transparent thin film oxide semiconductors, specifically zinc oxide (ZnO), produced by rf magnetron sputtering at room temperature with multifunctional properties. By controlling the deposition parameters it is possible to produce undoped material with electronic semiconductor properties or by doping it to get either n-type or p-type semiconductor behavior. In this work we refer our experience in producing n-type doping ZnO as transparent electrode to be used in optoelectronic applications such as solar cells and position sensitive detectors while the undoped ZnO can be used as UV photodetector or ozone gas sensor or even as active layer of fully transparent thin film transistors.

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Bakranova, Dina, Bekbolat Seitov e Nurlan Bakranov. "Preparation and Photocatalytic/Photoelectrochemical Investigation of 2D ZnO/CdS Nanocomposites". ChemEngineering 6, n. 6 (9 novembre 2022): 87. http://dx.doi.org/10.3390/chemengineering6060087.

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Properties of heterotructured semiconductors based on ZnO/CdS nanosheets are investigated for their possible application in photocatalytic and photoelectrochemical reactions. Semiconductor material is the main active coating of photoanodes, which triggers the half-reaction of water oxidation and reduction, which entails the purifying or splitting of water. This article explains nanocomposite assembly by convenient and simple methods. The study of the physicochemical properties of semiconductor layers is carried out using electron microscopy, X-ray diffractometry, and UV-visible spectroscopy. Studies of electrochemical properties are carried out by potential static methods in electrochemical cells.

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Più fonti

Tesi sul tema "Active semiconductors"

Haasmann, Daniel Erwin. "Active Defects in 4H–SiC MOS Devices". Thesis, Griffith University, 2015. http://hdl.handle.net/10072/367037.

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The research findings presented in this thesis have provided several key contributions towards a better understanding of the SiC–SiO2 interface in SiC MOS structures. The electrically active defects directly responsible for degrading the channel-carrier mobility in 4H–SiC MOSFETs have been identified and a novel technique to detect these defects in 4H–SiC MOS capacitors has been proposed and experimentally demonstrated. With a better understanding of defects at the SiC–SiO2 interface two alternative gate oxide growth processes have been proposed to overcome the practical limitations associated with current NO-nitridation techniques in high-volume, production based oxidation furnaces. This work therefore contributes to the wider research effort towards improving the performance of SiC MOSFETs in several ways. The following paragraphs summarise the key conclusions that have been obtained as a result of this study. Electrically Active Defects and the Channel-Carrier Mobility (Chapter 3) A critical review of defects at the SiC–SiO2 interface exposed a few key discrepancies in both the current understanding of the dominant defects responsible for channel-carrier mobility degradation in 4H–SiC MOSFETs and in the current approach to characterise and evaluate the SiC–SiO2 interface. Firstly, it was recognised that the Shockley-Read-Hall statistical model, based on thermally activated transport for traps spatially located at the semiconductor-oxide interface, cannot be directly applied to describe the transfer mechanism between free conduction band electrons and the shallow NITs near EC. This implication tends to suggest that the NITs near EC in SiC MOS structures cannot be accurately examined using traditional MOS characterisation techniques that are based on this statistical model. Secondly, in accordance with the studies conducted by Saks et. al. [1-3], it was realized that channel-carrier mobility degradation in 4H–SiC MOSFETs is primarily due to the significantly reduced free electron density in the inversion channel. In light of this understanding, the interfacial defects that actively trap channel electrons under strong inversion conditions were considered to be dominant in these devices as opposed to the NITs near EC that are typically examined using conventional MOS characterisation techniques on N-type MOS capacitors in depletion. To further support this hypothesis, a theoretical analysis of the inversion carrier concentration using the charge sheet model was conducted to demonstrate that the NITs with energy levels corresponding to strong inversion are of key importance to the channel-carrier mobility.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
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Almrabet, Meftah M. "Electrically active defects in novel Group IV semiconductors". Thesis, Sheffield Hallam University, 2006. http://shura.shu.ac.uk/19253/.

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This thesis presents the electrical characterisation of defects in novel group IV semiconducting materials: semiconducting diamond and silicon germanium (SiGe) virtual substrates. Several methods to clean diamond surfaces are introduced, which lead to the fabrication of a diamond Schottky diode with acceptable characteristics. Current-Voltage (I-V) and Capacitance-Voltage (C-V) measurements were carried out to study the electrical properties of both the diamond and SiGe Schottky diodes. Deep level transient spectroscopy (DLTS) and Laplace DLTS were then carried out to investigate the deep electronic states in these devices. Scanning Electron Microscopy (SEM) was also used to investigate defects in the diamond samples. For the diamond Schottky diodes, I-V and C-V measurements confirmed the quality of the fabricated Schottky diode; the measured phase angle between capacitance and voltage was close to 90° for temperatures greater than 300K and frequencies above 200 kHz and the device clearly exhibited rectification. DLTS and LDLTS measurements of the diamond did not show any signatures that could be attributed to isolated point defects. This could be due to the fact that it was necessary to take the samples to higher temperatures in order to fully ionize the boron in the sample. The boron acceptor is at 0.37 eV above the valence band and therefore only about 5% is ionised at room temperature. During the major part of the study at Manchester, there was no access to a high temperature cryostat. However, a clear capacitance transient was observed at lower temperatures and it is proposed that this is due to emission of holes from boron. Deep traps will be located deeper in the band gap than the boron. An additional problem was that the sample was of polycrystalline structure and is full of grain boundaries, which appear to be implicated in the leakage currents present in our devices. I-V, C-V, DLTS and LDLTS were also used to investigate the deep states in the SiGe virtual substrate. I-V and C-V measurements showed that the SiGe Schottky diode showed some leakage (reported by the suppliers) but nevertheless the diode exhibited rectification. Analysis of the DLTS data showed the presence of a defect in the SiGe samples which could be a structural defect, probably dislocation-related. However, the low background doping meant that a considerable depth below the surface was being measured in DLTS and depth profiling was not possible.

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Doolittle, William Alan. "Fundamental understanding, characterization, passivation and gettering of electrically active defects in silicon". Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/15710.

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He, Weiwei. "IGBT series connection based on cascade active voltage control with temporary clamp". Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708196.

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Maës, Clément. "Plasmonique active pour l’infrarouge sur semi-conducteur fortement dopé". Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTS033.

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Le contexte de ma thèse se situe dans le cadre de l’imagerie multispectrale infrarouge (IR) et traite notamment de la plasmonique, domaine de l’optique électromagnétique dont le but est d’étudier et d’exploiter des ondes de surface existant à l’interface entre un métal et un diélectrique. On cherche à miniaturiser des fonctions optiques grâce aux nanotechnologies et plus précisément à réaliser du filtrage spectrale IR au niveau du pixel de détection en intégrant un nano-résonateur. Usuellement, on utilise des diélectriques et des métaux mais l’intégration est complexe. J’explore le potentiel offert par les semi-conducteurs fortement dopés pour remplacer les métaux, ce qui pourrait permettre une meilleure intégration aux procédés technologiques de fabrication de photodétecteur ou d’émetteur. J’utilise des semi-conducteurs III-V, compatibles avec la croissance épitaxiale du super-réseau de type 2 (T2SL) des photodétecteurs infrarouge à ondes longues (LWIR). De plus, travailler avec un semi-conducteur fortement dopé offre la possibilité de modifier la fréquence de résonance en ajustant la densité de porteurs libres par action d’une différence de potentiel. J’étudie des architectures de composants "GMR" (Guided-mode resonance), usuellement formées d’un guide d’onde en diélectrique, siège de la résonance, et d’un réseau en diélectrique ou en métal permettant le couplage entre l’onde incidente ou transmise et le mode guidé grâce aux ordres ±1 diffractés par le réseau dans la couche mince. La tendance actuelle est d’intégrer ces composants directement au niveau du pixel de détection mais au prix de nombreuses étapes de fabrication. J’étudie la possibilité d’utiliser exclusivement des semi-conducteurs pour simplifier le procédé de fabrication et permettre une intégration monolithique du filtre au détecteur. Le guide d’onde est constitué d’un semi-conducteur intrinsèque et le réseau en semi-conducteur fortement dopé. La gamme spectrale d’intérêt se situe dans l’infrarouge lointain (8 μm - 14 μm).Dans un premier temps, les démonstrations théorique et expérimentale d’un filtre spectral nanostructuré tout semi-conducteur pour l’infrarouge fondé sur la résonance de mode guidé ont été effectuées. J’ai dimensionné puis fabriqué un échantillon dont la première étape consiste en le dépôt par épitaxie d’une couche de GaSb et d’une couche de InAsSb fortement dopé sur un substrat en GaAs avant une étape de photolithographie pour définir le masque de la gravure ionique réactive afin d’obtenir le réseau de diffraction. Un travail expérimental a ensuite permis de caractériser le composant (mesure sous incidence normale, étude angulaire, mesure à basse température) avec notamment la réalisation d’un banc de caractérisation angulaire. En parallèle, j’ai étudié un empilement approprié de matériaux dopés permettant, par application d’une tension électrique, de déplacer les électrons libres issus du dopage dans le réseau et le guide, ce qui modifie alors localement l’indice de réfraction et donc directement les conditions de guidage de la lumière par variation de phase. Différentes approches ont été présentées pour tenter d’ajuster la longueur d’onde de résonance du filtre spectral GMR : accumulation et déplétion des charges dans le réseau de diffraction, insertion d’une jonction P-N dans le guide d’onde, ...Enfin, une première brique pour l’intégration d’un T2SL dans un nano-résonateur optique pour réaliser un photodétecteur nanostructuré tout semi-conducteur a été étudiée. J’ai proposé́ la conception théorique de plusieurs nano-résonateurs intégrant un photodétecteur de type T2SL (filière InAs/GaSb). J’ai conçu trois architectures aux propriétés spectrales distinctes et qui diffèrent notamment par l’épaisseur de la couche de T2SL
The context of my thesis deals with infrared (IR) multispectral imaging and in particular with plasmonics, a field of electromagnetic optics whose the aim is to study and exploit surface waves existing at the interface between a metal and a dielectric. We seek to miniaturize optical functions thanks to nanotechnologies and more precisely to perform IR spectral filtering at the detection pixel level by integrating a nano-resonator. Usually we use dielectrics and metals, but the integration is complex. I am exploring the potential offered by heavily doped semiconductors to replace metals, which could allow better integration into technological processes for fabricate a photodetector or emitter. I use III-V semiconductors, compatible with the epitaxial growth of type 2 superlattice (T2SL) of long wave infrared photodetectors (LWIR). Furthermore, working with a heavily doped semiconductor offers the possibility of modifying the resonance frequency by adjusting the density of free carriers by the action of a potential difference.I study architectures of "GMR" components (Guided-Mode Resonance), usually formed by a waveguide in dielectric, where occurs the resonance, and a grating in dielectric or metal allowing the coupling between the incident or transmitted wave and the guided mode thanks to the ±1 orders diffracted by the grating in the thin layer. The current trend is to integrate these components directly at the level of the detection pixel but at the cost of numerous fabrication steps. I am studying the possibility of using exclusively semiconductors to simplify the fabrication process and allow monolithic integration of the filter into the detector. The waveguide consists of an intrinsic semiconductor and the grating of heavily doped semiconductor. The spectral range of interest is in the far infrared (8 μm - 14 μm).First, theoretical and experimental demonstrations of an all-semiconductor nano-structured spectral filter for infrared based on guided-mode resonance were carried out. I dimensioned and then fabricated a sample where the first step consists in depositing by epitaxy a layer of GaSb and a layer of highly doped InAsSb on a GaAs substrate before a photolithography step to define the mask of the etching reactive ionic etching in order to obtain the diffraction grating. An experimental work then made it possible to characterize the component (measurement under normal incidence, angular study, measurement at low temperature) with in particular the realization of an angular characterization setup.In parallel, I studied an appropriate stack of doped materials allowing, by applying an electrical voltage, to move the free electrons from doping in the grating and the guide, which then locally modifies the refractive index and therefore directly the conditions for guiding the light by phase variation. Different approaches have been presented in an attempt to adjust the resonance wavelength of the GMR spectral filter: accumulation and depletion of charges in the diffraction grating, insertion of a PN junction in the waveguide, ...Finally, a first brick for the integration of a T2SL in an optical nano-resonator to make an all-semiconductor nano-structured photodetector was studied. I proposed the theoretical design of several nano-resonators integrating a T2SL type photodetector (InAs/GaSb). I designed three architectures with distinct spectral properties, which differ in particular in the thickness of the T2SL layer

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Hill, Bradford K. Greene Michael E. "A linear CMOS tunable active resistor". Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Electrical_and_Computer_Engineering/Thesis/Hill_Bradford_35.pdf.

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Wang, Lei [Verfasser]. "Small molecule organic semiconductors as efficient visible light-active photocatalysts / Lei Wang". Mainz : Universitätsbibliothek der Johannes Gutenberg-Universität Mainz, 2017. http://d-nb.info/1225685842/34.

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Toffanin, Stefano. "Multifunctional organic semiconductors as active materials for electronic and opto-electronic devices". Doctoral thesis, Università degli studi di Padova, 2009. http://hdl.handle.net/11577/3426094.

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Since the first discovery of the photoelectric effect in anthracene, organic compounds have been studied as multi-functional materials because of their capability of showing a variety of properties such as charge transport, light absorption/emission, photoconductivity, electroluminescence and superconductivity. The work presented in this Ph.D. thesis aims at studying different classes of ?-conjugated organic materials that present functional properties suitable for the realization of opto-electronic devices. In particular we focus our attention on the two specific properties that are deeply correlated to the molecular arrangement in the realization of nano-scale multifunctional devices: charge transport and light emission. In the technologically appealing thin-films, the molecular arrangement is extremely sensitive to the deposition procedures and to the nature of the substrate. Thus, of great interest is the understanding at the micro- and nano-scale of the molecular architecture and morphological features which favour charge transport and/or energy transfer, in order to enhance performances of opto-electronic devices based on thin films. We show that in general linear ?-oligothiophenes can organize advantageously in thin-films in so as to guarantee the proper overlap between molecular orbitals which enables efficient field-effect charge transport. Introducing a new class of branched oligothiophenes (namely spider-like oligothiophenes) we aim at studying how complex 3D molecular architecture can affect optical emission, supermolecular organization and charge transport properties. Investigation on the enhancement of light emission efficiency of organic molecular systems is then carried out presenting a new host-guest lasing system obtained by co-evaporation of an oligo(9,9-diarylfluorene) derivative (T3, donor) with a well-known red-emitter dye (DCM, acceptor). In this binary blend, an efficient Förster energy transfer takes place from the T3 matrix to the dye molecules when the dye concentration is properly optimized. Moreover the mirrorless lasing measurements reveal that amplified spontaneous emission threshold of the 2% DCM:T3 sample is almost an order of magnitude lower than the 2% DCM:Alq3 model system measured in the same experimental conditions. The possibility of combining different functionalities in a single device is of great relevance for the further development of organic electronics in integrated components and circuitry. Organic light-emitting transistors (OLETs) have been demonstrated to be able to combine in a single device the electrical switching functionality of a field-effect transistor and the capability of light generation. When organic materials are implemented as active layers in device realization, interfaces formed by different materials are intrinsically important. The comprehension of the physics behind each interface is a crucial point to design new materials for device applications or to improve the performances of the existing ones Here we present a new approach for realizing ambipolar light-emitting transistor. In the heterostructure we propose the first layer and third layers are optimized for field-effect charge (electrons and holes) transport. The second layer is formed by a host-guest matrix with high optical performance and showing amplified spontaneous emission under optical pumping. The specificity of the presented tri-layer based OLET is the intrinsic separation of the charge transport region from the exciton formation region thus preventing completely the exciton-carrier quenching. The optimization of the charge transport and light emission properties allows the realization of a tri-layer heterojunction presenting balanced electron and hole mobility (~10-1-10-2 cm2/Vs), high charge carrier density in correspondence of the maximum electroluminescence emission (~ 1 KA/cm2) and intense light generation.
Fin dalla scoperta dell’effetto fotoelettrico nell’antracene, i composti organici sono stati studiati come materiali multifunzionali data la loro capacità di mostrare una varietà di proprietà differenti, come il trasporto di carica, emissione/assorbimento di luce, fotoconduttività, elettroluminescenza e superconduttività. Il lavoro presentato in questa tesi di dottorato si prefigge lo scopo di studiare differenti classi di materiali organici ? coniugati che presentino le proprietà funzionali adatte per la realizzazione di dispositivi optoelettronici. In particolare viene prestata particolare attenzione allo studio di due specifiche proprietà che sono profondamente connesse con l’organizzazione molecolare nei dispositivi multifunzionali con dimensioni nanometriche: il trasporto di carica e l’emissione di luce. Nei film sottili, univocamente considerati interessanti dal punto di vista tecnologico, l’organizzazione molecolare è fortemente dipendente dai processi di deposizione e dalla natura del substrato. Per aumentare le prestazioni dei dispositivi basati sui film sottili risulta fondamentale comprendere le strutture supermolecolari e le caratteristiche morfologiche su scala micro- e nanometrica che possono favorire il trasporto di carica e/o i processi di trasferimento di energia. Si dimostra che in generale gli oligotiofeni lineari depositati in film sottile possano organizzarsi vantaggiosamente in modo da garantire l’opportuna sovrapposizione tra gli orbitali molecolari che permette un efficiente trasporto di carica. Introducendo una nuova classe di oligotiofeni ramificati, denominati spider-like, ci proponiamo di studiare come una complessa architettura 3D possa modificare le proprietà di emissione, di organizzazione supermolecolare e di trasporto. Si procede quindi ad indagare la possibilità di aumentare l’efficienza di emissione di luce di sistemi organici molecolari mediante l’introduzione di un nuovo sistema host-guest con proprietà di lasing ottenuto sublimando un derivato diarilfluorenico (T3, donore) con una noto colorante emettitore nel rosso (DCM, accettare). In questa soluzione solida binaria, si verifica un efficiente trasferimento di energia alla Förster tra la matrice di T3 e le molecole di colorante quando la concentrazione di colorante viene opportunamente ottimizzata. Inoltre, la soglia di emissione spontanea amplificata del campione avente le molecole di DCM disperse al 2% in peso nel T3 risulta quasi un ordine di grandezza più bassa rispetto a quella del campione modello misurato nelle stesse condizioni sperimentali avente la stessa concentrazione in peso si molecole di DCM disperse in una matrice di Alq3. La possibilità di combinare diverse proprietà funzionali in un unico dispositivo risulta di notevole interesse per un ulteriore sviluppo dell’elettronica organica nei componenti integrati e nei circuiti. Si è dimostrato che i transistor organici ad emissione di luce sono capaci di combinare in un singolo dispositivo le proprietà di switch dei transistor ad effetto di campo con la capacità di generare luce. Quando i materiali organici vengono utilizzati come strati attivi nei dispositivi, le interfacce formate dai diversi materiali assumono un ruolo di primaria importanza. La comprensione dei processi fisici che avvengono ad ogni interfaccia è cruciale per disegnare nuovi materiali per dispositivi o per aumentare le prestazioni quelli già esistenti. In questo lavoro di tesi viene presentato un nuovo approccio per realizzare transistor ambipolari ad emissione di luce. Nell’eterogiunzione che viene proposta il primo e il terzo strato sono dedicati al trasporto di portatori di carica (elettroni e lacune) per effetto di campo mentre il secondo strato è formato da una soluzione solida host-guest che mostra efficiente emissione di luce ed emissione spontanea di luce se pompata otticamente. La specificità dell’approccio che presentiamo è che le regioni di trasporto di carica sono fisicamente separate da quella in cui avviene la formazione dell’eccitone. In questo modo viene ridotta completamente l’interazione tra l’eccitone e il portatore di carica. Dopo aver ottimizzato il trasporto di carica e le proprietà di emissione di luce, si è potuto realizzare un dispositivo basato sull’eterogiunzione a tre strati che presenta valori di mobilità per gli elettroni e le lacune bilanciati (~10-1-10-2 cm2/Vs), alta densità di portatori di carica in corrispondenza del massimo di elettroluminescenza (~ 1 KA/cm2) e intensa emissione di luce.

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Palakodety, Atmaram Mohanty Saraju. "CMOS active pixel sensors for digital cameras current state-of-the-art /". [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3631.

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Shen, Chao. "Study of CMOS active pixel image sensor on SOI/SOS substrate /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20SHEN.

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Abstract (sommario):

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 67-69). Also available in electronic version. Access restricted to campus users.

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Libri sul tema "Active semiconductors"

Mitchell, W. S. E. Compendium of active devices. London: Institution of Electrical and Electronic Incorporated Engineers, 1987.

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Yuan, Fei. CMOS active inductors and transformers: Principle, implementation, and applications. New York: Springer, 2008.

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Fistulʹ, V. I. Amfoternye primesi v poluprovodnikakh. Moskva: "Metallurgii͡a︡", 1992.

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Workshop on Radiation-Induced and/or Process-Related Electrically Active Defects in Semiconductor-Insulator Systems (2nd 1989 Microelectronics Center of North Carolina). Proceedings from the Second Workshop on Radiation-Induced and/or Process-Related Electrically Active Defects in Semiconductor Systems. A cura di Reisman A, Microelectronics Center of North Carolina., North Carolina State University e University of North Carolina at Charlotte. Research Triangle Park, NC: MCNC, 1989.

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W, E. Heraeus Seminar (157th 1996 Bad Honnef Germany). Self-organization in activator-inhibitor-systems: Semiconductors, gas-discharge and chemical active media : contributions to the 157th WE-Heraeus-Seminar, March 4-6, 1996. Berlin: Wissenschaft und technik Verlag, 1996.

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Inc, Siborg Systems, a cura di. Semiconductor devices explained: Using active simulation. Chichester [England]: J. Wiley, 1999.

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Gorelikov, Ivan. Hybrid plymer-semiconductor materials optically active in Vis-NIR region. Ottawa: National Library of Canada, 2003.

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Integrated Photonics Research Topical Meeting. (1991 Monterey, Calif.). Integrated photonics research: Summaries of papers presented at the Integrated Photonics Research Topical Meeting, April 9-11, 1991, Monterey, California ; including Workshop on Active and Passive Fiber Components. Washington, D.C: Optical Society of America, 1991.

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Optically Active Charge Traps And Chemical Defects In Semiconducting. Springer International Publishing AG, 2013.

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Rhodes, R. G., e Heinz K. Henisch. Imperfections and Active Centres in Semiconductors: International Series of Monographs on Semiconductors, Vol. 6. Elsevier Science & Technology Books, 2014.

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Capitoli di libri sul tema "Active semiconductors"

Candal, Roberto, e Azael Martínez-de la Cruz. "New Visible-Light Active Semiconductors". In Photocatalytic Semiconductors, 41–67. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10999-2_2.

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Stroyuk, Oleksandr. "Synthesis of Nanocrystalline Photo-Active Semiconductors". In Lecture Notes in Chemistry, 241–318. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68879-4_5.

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Nishanthi, S. T., Battula Venugopala Rao e Kamalakannan Kailasam. "Metal-Free Organic Semiconductors for Visible-Light-Active Photocatalytic Water Splitting". In Visible Light-Active Photocatalysis, 329–63. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527808175.ch12.

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Spassova, Emily M. "Semiconductor on the Basis of Active ZnO". In Proceedings of the 17th International Conference on the Physics of Semiconductors, 951–53. New York, NY: Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4615-7682-2_212.

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Strijbos, R. C., A. V. Muravjov, J. H. Blok, J. N. Hovenier, J. G. S. Lok, S. G. Pavlov, R. N. Schouten, V. N. Shastin e W. Th Wenckebach. "Active Mode Locking of a P-GE Light-Heavy Hole Band Laser by Electrically Modulating its Gain: Theory and Experiment". In Hot Carriers in Semiconductors, 631–33. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0401-2_145.

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Rink, Klaus, e Wolfgang Jöckel. "New Concepts of High Current Sensing by Using Active Semiconductors for the Energy Management in Automotive Applications". In Advanced Microsystems for Automotive Applications 2012, 27–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29673-4_3.

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Powell, Richard F. "Semiconductor Diodes". In Testing Active and Passive Electronic Components, 83–101. Boca Raton: Routledge, 2022. http://dx.doi.org/10.1201/9780203737255-7.

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Bezoušek, P. "Modelling of Active Semiconductor Circuit Elements". In Microwave Integrated Circuits, 136–72. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1224-6_3.

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Ben Moshe, Assaf, e Gil Markovich. "Optically Active and Chiral Semiconductor Nanocrystals". In Chiral Nanomaterials: Preparation, Properties and Applications, 85–98. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527682782.ch4.

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Rastelli, Armando, Suwit Kiravittaya e Oliver G. Schmidt. "Growth and control of optically active quantum dots". In Single Semiconductor Quantum Dots, 31–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-87446-1_2.

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Atti di convegni sul tema "Active semiconductors"

Fischer, Anna, Wai Kit Ng, Jakub Dranczewski, Dhruv Saxena, T. V. Raziman, Tobias Farchy, Jonathan Peters et al. "Image sensitive spectral response of semiconductor random network lasers". In Active Photonic Platforms (APP) 2024, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou, 6. SPIE, 2024. http://dx.doi.org/10.1117/12.3028100.

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Hosono, Hideo. "Amorphous Oxide Semiconductor TFTs Toward Memory Application". In 2024 31st International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD), 4–5. IEEE, 2024. http://dx.doi.org/10.23919/am-fpd61635.2024.10615885.

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Kazakov, Dmitry, Theodore P. Letsou, Marco Piccardo, Lorenzo Columbo, Massimo Brambilla, Franco Prati, Pawan Ratra et al. "Active nonlinear mid-infrared photonics". In CLEO: Science and Innovations, SM4N.5. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_si.2024.sm4n.5.

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Abstract (sommario):

Our DC-driven semiconductor laser chip generates one picosecond solitons at 8.3 µm, using active nonlinear resonators. It integrates all components (pump, resonator, filter), enabling turnkey, background-free bright pulse generation with immediate applications in nonlinear mid-infrared photonics.

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Taghinejad, Hossein, e Ali Adibi. "Ultra-miniaturized lateral heterostructures in 2D semiconductors". In Active Photonic Platforms XIII, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2021. http://dx.doi.org/10.1117/12.2593849.

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Menon, Vinod M. "Control of light-matter interaction in 2D semiconductors". In Active Photonic Platforms XIII, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2021. http://dx.doi.org/10.1117/12.2594379.

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Jariwala, Deep. "Strong light-matter coupling in hetero-structures of atomically thin semiconductors". In Active Photonic Platforms XII, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2020. http://dx.doi.org/10.1117/12.2567587.

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Vasa, P., W. Wang, R. Pomraenke, M. Maiuri, C. Manzoni, G. Cerullo e C. Lienau. "Active plasmonics: merging metals with semiconductors". In SPIE OPTO, a cura di Markus Betz, Abdulhakem Y. Elezzabi, Jin-Joo Song e Kong-Thon Tsen. SPIE, 2014. http://dx.doi.org/10.1117/12.2038091.

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Kim, Kwanghyun, Joshua Perkins, Avik Mandal e Behrad Gholipour. "Volatile broadband switchable thermo-optic properties of phase change chalcogenide semiconductors". In Active Photonic Platforms (APP) 2023, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2023. http://dx.doi.org/10.1117/12.2677104.

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Foerste, Jonathan, Victor Funk, Johannes Scherzer, Shen Zhao, Alexander Hoegele e Samarth Vadia. "Two-dimensional semiconductors for chiral directionality and electro-optic modulation in photonic systems". In Active Photonic Platforms (APP) 2023, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2023. http://dx.doi.org/10.1117/12.2677335.

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Cojocaru, Crina, Laura Rodríguez-Suné, Michael Scalora, Neset Akozbek, Maria Atonietta Vincenti, Domenico de Ceglia e Jose Trull. "Harmonic generation in the opaque region of semiconductors: the role of the surface and magnetic nonlinearities". In Active Photonic Platforms XII, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2020. http://dx.doi.org/10.1117/12.2567233.

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Rapporti di organizzazioni sul tema "Active semiconductors"

Nurmikko, Arto V. Optically Active 3-Dimensional Semiconductor Quantum Dot Assemblies in Heterogeneous Nanoscale Hosts. Office of Scientific and Technical Information (OSTI), maggio 2017. http://dx.doi.org/10.2172/1355658.

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William L. Dunn e Douglas McGregor. High-Efficiency Thin-Film-Coated Semiconductor Neutron Detectors for Active Dosimetry Monitors. Office of Scientific and Technical Information (OSTI), dicembre 2009. http://dx.doi.org/10.2172/970981.

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Metzger, Wyatt K. Photovoltaic Cells Employing Group II-VI Compound Semiconductor Active Layers: Cooperative Research and Development Final Report, CRADA Number CRD-09-325. Office of Scientific and Technical Information (OSTI), settembre 2018. http://dx.doi.org/10.2172/1475129.

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