Relevant bibliographies by topics / Nanostructured Oxide Semiconductors / Dissertations / Theses
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Dissertations / Theses on the topic 'Nanostructured Oxide Semiconductors'

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Published: 7 September 2023

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1

Berhe, Seare Ahferom. "Acceptor-sensitizers for Nanostructured Oxide Semiconductor in Excitonic Solar Cells." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699927/.

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Organic dyes are examined in photoelectrochemical systems wherein they engage in thermal (rather than photoexcited) electron donation into metal oxide semiconductors. These studies are intended to elucidate fundamental parameters of electron transfer in photoelectrochemical cells. Development of novel methods for the structure/property tuning of electroactive dyes and the preparation of nanostructured semiconductors have also been discovered in the course of the presented work. Acceptor sensitized polymer oxide solar cell devices were assembled and the impact of the acceptor dyes were studied.
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2

Wang, Jinfeng. "Characterization and synthesis of nanoscale materials." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/JinfengWang_09007dcc80564540.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology and University of Missouri--St. Louis, 2008.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed August 28, 2008) Thesis completed as part of a cooperative degree program with Missouri University of Science & Technology and the University of Missouri--St. Louis. Includes bibliographical references (p. 129-142).
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3

Akande, Amos Adeleke. "Gas sensing properties of nanostructured vanadium oxide semiconductors by chemoresistive and optical methods." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/65892.

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The aims of this research thesis are to synthesise VO2, V2O5 and V6O13 nanostructures and apply the materials on sensor electrodes for gas and humidity sensing. These materials were synthesised and optimised using chemical vapour deposition (CVD), microwave assisted and pulse laser deposition (PLD) techniques. Analyses with thermogravimetric (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometry (VSM), Raman and
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4

Zhang, Shaolin. "Wide band gap nanomaterials and their applications." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B41758225.

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5

Zhang, Shaolin, and 張少林. "Wide band gap nanomaterials and their applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B41758225.

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6

Lima, Francisco Anderson de Sousa. "Application of transition-metal-oxide-based nanostructured thin films on third generation solar cells." reponame:Repositório Institucional da UFC, 2015. http://www.repositorio.ufc.br/handle/riufc/14584.

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LIMA, F. A. S. Application of transition-metal-oxide-based nanostructured thin films on third generation solar cells. 2015. 225 f. Tese (Doutorado em Ciência de Materiais) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2015.<br>Submitted by Marlene Sousa (mmarlene@ufc.br) on 2015-12-17T12:45:41Z No. of bitstreams: 1 2015_tese_faslima.pdf: 24015209 bytes, checksum: a66470eb7a55b6b3c2a5e8544c6d4d32 (MD5)<br>Approved for entry into archive by Marlene Sousa(mmarlene@ufc.br) on 2015-12-18T12:18:53Z (GMT) No. of bitstreams: 1 2015_tese_faslima.pdf: 24015209 bytes, checksum: a66470
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Chen, Xinyi, and 陈辛夷. "Wide band-gap nanostructure based devices." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49799290.

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Wide band gap based nanostructures have being attracting much research interest because of their promise for application in optoelectronic devices. Among those wide band gap semiconductors, gallium nitride (GaN) and zinc oxide (ZnO) are the most commonly studied and optoelectronic devices based on GaN and ZnO have been widely investigated. This thesis concentrates on the growth, optical and electrical properties of GaN and ZnO nanostructures, plus their application in solar cells and light emitting diodes (LEDs). GaN-nanowire based dye sensitized solar cells were studied. Different post-grow
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8

Hansson, (f d. Wadeasa) Amal. "Heterojunctions between zinc oxide nanostructures and organic semiconductor." Doctoral thesis, Linköpings universitet, Fysik och elektroteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-71843.

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Lighting is a big business, lighting consumes considerable amount of the electricity. These facts motivate for the search of new illumination technologies that are efficient. Semiconductor light emitting diodes (LEDs) have huge potential to replace the traditional primary incandescent lighting sources. They are two basic types of semiconductor LEDs being explored: inorganic and organic semiconductor light emitting diodes. While electroluminescence from p-n junctions was discovered more than a century ago, it is only from the 1960s that their development has accelerated as indicated by an expon
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9

González, Zalba Miguel Fernando. "Single donor detection in silicon nanostructures." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608181.

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10

Khunou, Ramotseng. "Gas sensing properties of Ceo2 nanostructures." University of the Western Cape, 2020. http://hdl.handle.net/11394/7909.

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>Magister Scientiae - MSc<br>The industrial safety requirements and environmental pollution have created a high demand to develop gas sensors to monitor combustible and toxic gases. As per specifications of World Health Organization (WHO) and Occupational Safety and Health Administration (OSHA), lengthy exposure to these gases lead to death which can be avoided with early detection. Semiconductor metal oxide (SMO) has been utilized as sensor for several decades. In recent years, there have been extensive investigations of nanoscale semiconductor gas sensor.
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11

ZHANG, JIE. "INVESTIGATIONS OF OXIDE AND SULFIDE BASED LOW DIMENSIONAL NANO STRUCTURES FOR CONDUCTOMETRIC GAS SENSORS, MEMRISTORS AND PHOTODETECTORS." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1086.

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Low dimensional semiconductors are promising materials with diverse range of applications in a variety of fields. Specifically, in recent times low dimensional oxide and sulfide based semiconductors are regarded as materials that can have potential applications in chemical gas sensor, optoelectronic devices and memristor. How ever, in some cases it is envisioned that appropriate doping as well as phase stabilization is important in enhancing their material properties. This work presents the synthesis, characterization and application of various (pristine and doped) quasi-one dimensional metal
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Simo, Aline. "Physical properties of vanadium dioxide nanoparticles: application as 1-d nanobelts room temperature for hydrogen gas sensing." Thesis, University of the Western Cape, 2013. http://hdl.handle.net/11394/4581.

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Philosophiae Doctor - PhD<br>Transition metal oxides magneli phases present crystallographic shear structure which is of great interest in multiple applications because of their wide range of valence, which is exhibited by the transition metals. The latter affect chemical and physical properties of the oxides. Amongst them we have nanostructures VO2 system of V and O components which are studied including chemical and physical reactions based on non-equilibrium thermodynamics. Due to their structural classes of corundum, rocksalt, wurtzite, spinel, perovskite, rutile, and layer structure, thes
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13

Chunder, Anindarupa. "FABRICATION OF FUNCTIONAL NANOSTRUCTURES USING POLYELECTROLYTE NANOCOMPOSITES AND REDUCED GRAPHENE OXIDE ASSEMBLIES." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3082.

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A wide variety of nanomaterials ranging from polymer assemblies to organic and inorganic nanostructures (particles, wires, rods etc) have been actively pursued in recent years for various applications. The synthesis route of these nanomaterials had been driven through two fundamental approaches -  Top down and  Bottom up . The key aspect of their application remained in the ability to make the nanomaterials suitable for targeted location by manipulating their structure and functionalizing with active target groups. Functional nanomaterials like polyelectrolyte based multilayered thin film
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14

Yang, Li Li. "Synthesis and Characterization of ZnO Nanostructures." Doctoral thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-60815.

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One-dimensional ZnO nanostructures have great potential applications in the fields of optoelectronic and sensor devices.  Therefore, it is very important to realize the controllable growth of one-dimensional ZnO nanostructures and investigate their properties. The main points for this thesis are not only to successfully realize the controllable growth of ZnO nanorods (ZNRs), ZnO nanotubes (ZNTs) and ZnMgO/ZnO heterostructures, but also investigate the structure and optical properties in detail by means of scanning electron microscope (SEM), transmission electron microscope (TEM), resonant Rama
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15

Clavijo, William Paul. "Low-temperature Fabrication Process for Integrated High-Aspect Ratio Metal Oxide Nanostructure Semiconductor Gas Sensors." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4781.

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This work presents a new low-temperature fabrication process of metal oxide nanostructures that allows high-aspect ratio zinc oxide (ZnO) and titanium dioxide (TiO2) nanowires and nanotubes to be readily integrated with microelectronic devices for sensor applications. This process relies on a new method of forming a close-packed array of self-assembled high-aspect-ratio nanopores in an anodized aluminum oxide (AAO) template in a thin (2.5 µm) aluminum film deposited on a silicon and lithium niobate substrate (LiNbO3). This technique is in sharp contrast to traditional free-standing thick film
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16

Wang, Dake Park Minseo. "Optical spectroscopy of wide-band-gap semiconductors raman and photoluminescence of gallium nitride, zinc oxide and their nanostructures /." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Fall/Dissertations/WANG_DAKE_24.pdf.

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17

Prades, García Juan Daniel. "Modelling of the Chemical and Light Interactions in Individual Metal Oxide Nanowires for Sensing Applications." Doctoral thesis, Universitat de Barcelona, 2009. http://hdl.handle.net/10803/663486.

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En la presente tesis se analizan desde el punto de vista de la modelización teórica los mecanismos de interacción de gases y luz con nanohilos individuales de óxidos metálicos. Desde este enfoque novedoso, se pretende alcanzar una mayor compresión de los mecanismos de transducción que dan lugar a la utilidad de dichos materiales en aplicaciones de sensado químico y de luz. Los resultados que aquí se presentan permiten comprender los detalles de las interacciones de gases, tanto oxidantes como reductores, sobre superficies de óxidos metálicos; siendo especialmente remarcable el descubrimiento d
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18

Vabbina, Phani Kiran. "Sonochemical Synthesis of Zinc Oxide Nanostructures for Sensing and Energy Harvesting." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2534.

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Semiconductor nanostructures have attracted considerable research interest due to their unique physical and chemical properties at nanoscale which open new frontiers for applications in electronics and sensing. Zinc oxide nanostructures with a wide range of applications, especially in optoelectronic devices and bio sensing, have been the focus of research over the past few decades. However ZnO nanostructures have failed to penetrate the market as they were expected to, a few years ago. The two main reasons widely recognized as bottleneck for ZnO nanostructures are (1) Synthesis technique which
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19

Yu, Zexin. "Development and characterization of metal oxide semiconductor films deposited by solution precursor thermal spray process." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCA036.

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Les procédés de photodégradation, de conversion photocatalytique du CO2 et la technologie des supercondensateurs représentent des options intéressantes pour palier aux problèmes environnementaux et pour apporter des réponses à la crise énergétique. Dans ces trois domaines, les matériaux à base d'oxydes métalliques sont très prometteurs. Cependant, les voies classiques (c'est-à-dire par voies hydrothermales ou de sol-gels) présentent un certain nombre d’inconvénients tels que leur longues durées de préparation et leurs rendements limités. En outre, la mise en oeuvre de nanopoudres suppose une o
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20

Zhang, Kelvin Hongliang. "Structural and electronic investigations of In₂O₃ nanostructures and thin films grown by molecular beam epitaxy." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:de125918-b36f-47cc-b72d-2f3a27a96488.

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Transparent conducting oxides (TCOs) combine optical transparency in the visible region with a high electrical conductivity. In2O3 doped with Sn (widely, but somewhat misleadingly, known as indium tin oxide or ITO) is at present the most important TCO, with applications in liquid crystal displays, touch screen displays, organic photovoltaics and other optoelectronic devices. Surprisingly, many of its fundamental properties have been the subject of controversy or have until recently remained unknown, including even the nature and magnitude of the bandgap. The technological importance of the mat
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21

Falyouni, Farid. "Croissance et propriétés de nanostructures à base de ZnO." Versailles-St Quentin en Yvelines, 2011. http://www.theses.fr/2011VERS0017.

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Ce travail a pour objectif d'étudier la croissance et les propriétés des nanostructures unidimensionnelles (nanofils) à base de ZnO. Ces nanostructures ont été réalisées par approche bottom-up selon deux mécanismes de croissance : Vapeur-Solide (VS, non catalysé) et Vapeur-Liquide-Solide (VLS, catalysé via une gouttelette d'or). Les matériaux étudiés sont élaborés par MOCVD. Les nanofils ont été caractérisés par différentes techniques, notamment en microscopie électronique à balayage (MEB), microscopie électronique en transmission TEM, spectroscopie Raman, spectroscopie de Photoluminescence (P
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22

El, Zein Basma. "Growth and characterization of zinc oxide (ZnO) nanostructures for photovotaic applications." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10141/document.

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Le développement des nanotechnologies offre de nouvelles perspectives pour la conception des cellules solaire à fort rendement de conversion. Jusqu’à présent les efforts se sont portés principalement sur des structures à base de semi-conducteurs, de métaux et de polymères. Dans nos travaux, nous avons considéré des nanoparticules de Sulfure de Plomb (PbS) pour lesquelles l'énergie de bande interdite et les propriétés optiques sont fonction de la taille de la particule afin de tirer parti de l'ensemble du spectre optique couvert par l'énergie solaire. Nous avons également considéré des nanofils
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23

Renault, Christophe. "Spectroélectrochimie résolue en temps de biomolécules sur électrode poreuse transparente nanostructurée." Paris 7, 2011. http://www.theses.fr/2011PA077173.

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Des molécules comme les enzymes et certains complexes biomimétiques sont capables de catalyser des réactions chimiques avec une grande efficacité grâce à des mécanismes relativement complexes. Pour étudier ces derniers, nous avons développé une nouvelle technique de spectroélectrochimie résolue en temps où la sonde redox est immobilisée dans un film inorganique poreux plus ou moins conducteur et transparent dans le visible. Dans un premier temps, nous avons utilisé un film semiconducteur de TiO₂ déposé par voie sol gel (EISA) et caractérisé par une mésoporosité hautement structurée. Des expéri
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Amirifar, Nooshin. "Métrologie des dopants dans les nanostructures ZnO par sonde atomique tomographique." Rouen, 2015. http://www.theses.fr/2015ROUES030.

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Ces dernières années, un nombre accru de travaux de recherche ont été menés pour le développement de dispositifs optoélectroniques et électroniques à base de ZnO. La conception de ces dispositifs nécessite une maîtrise totale des processus de synthèse et de dopage car ils en déterminent les propriétés électriques et optiques finales. Aujourd’hui encore, l'un des obstacles majeur à la réalisation de tels dispositifs réside dans la difficulté d’obtenir un dopage de type-p dans le ZnO. Il faut pour cela des techniques de caractérisation pouvant fournir des informations directes sur la distributio
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Merupo, Victor Ishrayelu. "Synthèse et caractérisation de matériaux nanostructurés BiVO4 dopés par des métaux pour des applications en Photocatalyse." Thesis, Le Mans, 2016. http://www.theses.fr/2016LEMA1006/document.

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Le travail de thèse est consacré à la synthèse, l’élaboration et à l’étude des propriétés physiques d’une famille d’oxydes semi-conducteurs BiVO4 sous formes de nanostructures et de films minces incluant un dopage métallique (Metal = Cu, Mo et Ag) dans le but de réaliser des photocatalyseurs efficaces sous irradiation en lumière visible. La synthèse de nanopoudres dopées a ainsi été effectuée par la technique de broyage planétaire à haute énergie ainsi que par la méthode sol-gel. Les matériaux obtenus et les effets de dopage ont été étudiés sur les caractéristiques structurales, électroniques
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26

Koussi-Daoud, Sana. "Préparation électrochimique et caractérisation de couches nanostructurées de semi-conducteurs de type p pour cellules photovoltaïques hybrides." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066505/document.

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Cette thèse visait à développer des techniques de croissance électrochimiques d'oxydes pour obtenir des semi-conducteurs de type p utilisables comme photocathodes dans les cellules solaires à colorant (p-DSSC). Dans la littérature, la méthode d'électrodépôt n'a pas été explorée pour l'application p-DSSC. Les conditions de synthèse de films de NiO avec une épaisseur contrôlée ont été définies. Des couches de NiO ont été obtenues par électrodépôt en milieu aqueux, en milieu éthanol, en milieu diméthylsulfoxide DMSO et en milieu mixte DMSO/eau. Ces couches ont été caractérisées par DRX, spectrosc
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Sandana, Eric Vinod. "Synthèse et maîtrise de la croissance de nanocristaux : applications aux composants à base de semi-conducteurs à grande bande interdite." Palaiseau, Ecole polytechnique, 2011. http://pastel.archives-ouvertes.fr/docs/00/64/06/52/PDF/Eric_Vinod_SANDANA_Ecole_Polytechnique_EDX_447.pdf.

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Ce travail a pour objectif la maitrise de la croissance et l'analyse des propriétés des nanostructures d'oxyde de zinc (ZnO). Trois procédés de fabrication de nanostructures de ZnO ont été étudiés : dépôt chimique en phase vapeur de composés organométalliques (MOCVD), dépôt par ablation laser (PLD) et dépôt par transport physique en phase vapeur (PVT). Les substrats utilisés pour cette étude sont : saphir, silicium, ZnO massif, acier austénitique, mylar et papier. Les nanostructures ont été caractérisées par différentes techniques, notamment la microscopie électronique à balayage, la photolumi
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Bouhjar, Feriel. "Preparation et performance d'une cellule photocatalytique à base d'hématite pour la génération d'hydrogène." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/106345.

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El hidrógeno es un portador de energía que ya ha demostrado su capacidad para reemplazar el petróleo como combustible. Sin embargo, los medios de producción actualmente en uso siguen siendo altamente emisores de gases de efecto invernadero. La foto-electrólisis del agua es un proceso que, a partir de la energía solar, separa los compuestos elementales del agua como el hidrógeno y el oxígeno utilizando un semiconductor con propiedades físicas adecuadas. La hematita (¿-Fe2O3) es un material prometedor para esta aplicación debido a su estabilidad química y su capacidad para absorber una porción s
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Haneche, Nadia. "Etudes optiques de ZnO et des solutions solides Zn[1-x]MgxO et Zn[1-x]CdxO : conception de nanostructures et dopage de type p." Versailles-St Quentin en Yvelines, 2011. http://www.theses.fr/2011VERS0037.

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L’oxyde de zinc (ZnO) est un semi conducteurs à grand gap actuellement très étudié pour les applications en optoélectronique. Les verrous actuels pour ces applications sont liés à la conception de structures à puits quantiques, et surtout à la réalisation du dopage type p de ZnO. Dans cette perspective, nous avons étudié les propriétés optiques des couches élaborées par MOCVD principalement à l’aide de la photoluminescence (PL). Les alliages Zn1-xMgxO et Zn1-xCdxO ont montré de très bons taux d’incorporation du Mg et de Cd. Les hétérostructures à puits quantiques de ZnO/Zn1-XMgXO polaires, et
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González, Fernández Alfredo A. "Studies and integration of Silicon-based light emitting systems." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/285863.

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This project presents the study of luminescent devices and materials based on silicon for its use in the fabrication of an optical system that integrates light emitter, waveguide, and light sensor in a single chip obtained by the use of standard CMOS techniques and materials. The atomic and structural characteristics of the materials are analysed and related to its luminescent response. Taking into account the results from the active material characterization, the design, fabrication, and characterization of electroluminescent devices based on such materials is presented. Finally, the design,
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Altomare, M. "TOWARDS THE PHOTOCATALYTIC PRODUCTION OF SOLAR FUELS - NANOSTRUCTURED TITANIUM DIOXIDE FOR PHOTOCATALYSIS & PHOTO-ELECTROCHEMISTRY." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/229553.

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In spite of many efforts given during the last decades to find new alternative photocatalytic materials, titanium dioxide (TiO2) still represents the most widely employed semiconductor for photocatalytic applications, being photoactive, cheap, easily available, non-toxic, inert and, most of all, chemically stable. However, although exhibiting a powerful combination of extraordinary and attractive physico-chemical properties, it suffers from some issues, common to all semiconductors, related to the dynamic of the charge carriers. Precisely, trapping and recombination of valence band holes and c
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Al-Saadi, Ali. "Preparation and characterisation of encapsulation magnetic metal iron oxide nanoparticles." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:57bdcf38-9d45-48ab-a971-a2d60e2e4391.

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One of the most challenging goals in nanoparticle research is to develop successful protocols for the large-scale, simple and possibly low-cost preparation of morphologically pure nanoparticles with enhanced properties. The work presented in this thesis was focused on the synthesis, characterisation and testing of magnetic nanoparticles and their potential applications. There are a number of magnetic nano-materials prepared for specific applications such as metal oxide nanoparticles encapsulated with various porous materials including Fe₃O₄/Fe₂O₃ coated with soft bio-organic materials such as
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Demoulin, Rémi. "Etude structurale et cartographie du dopage dans des oxydes nanostructurés à base de sillicium." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR086/document.

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La modification des propriétés optiques et électriques du silicium apportée par la réduction en taille, notamment due aux effets de confinement quantique des porteurs de charges, est aujourd'hui bien connue et a permis le développement de nouveaux systèmes en optoélectronique. Comme dans le cas du silicium massif, le dopage devrait permettre d'optimiser les propriétés du silicium nanostructuré. Cependant, les caractéristiques du dopage dans le silicium nanostructuré sont encore mal comprises et de nombreux questionnements, concernant la localisation des impuretés ainsi que leur état d'activati
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Schlur, Laurent. "Elaboration de cellules photovoltaïques hybrides solides à base d'oxyde de zinc nanostructuré." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00864794.

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Cette thèse est consacrée à l'élaboration de cellules photovoltaïques hybrides solides sensibilisées à colorant, composées d'une couche dense de germes de ZnO recouverte de nanobâtonnets de ZnO sensibilisés par un colorant et infiltrés par du spiro-OMeTAD. La couche dense de germes de ZnO a été optimisée, afin qu'elle soit compacte, homogène et bien orientée. Les nanobâtonnets sont synthétisés par voie hydrothermale. L'influence de différents paramètres de synthèse sur la morphologie des nanobâtonnets a été testée. Deux méthodes permettant de modifier l'écart entre les nanobâtonnets ont égalem
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Rauscher, Michael D. "Strain mediated self-assembly of ceramic nano islands." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196195105.

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Mahato, Prabir. "Study and development of resistive memories for flexible electronic applications." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI134.

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L’avènement de l’électronique flexible a entraîné des recherches rapides sur des capteurs, des dispositifs bio-implantables et portables pour l’évaluation de maladies telles que l’épilepsie, la maladie de Parkinson et les crises cardiaques. Les dispositifs de mémoire sont des composants majeurs dans tous les circuits électroniques, uniquement secondaires aux transistors, par conséquent de nombreux efforts de recherche sont consacrés au développement de dispositifs de mémoire flexibles. Les mémoires à accès aléatoire à pont conducteur (CBRAM) basées sur la création / dissolution d'un filament m
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37

Holder, Jenna Ka Ling. "Quantum structures in photovoltaic devices." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:d23c2660-bdba-4a4f-9d43-9860b9aabdb8.

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A study of three novel solar cells is presented, all of which incorporate a low-dimensional quantum confined component in a bid to enhance device performance. Firstly, intermediate band solar cells (IBSCs) based on InAs quantum dots (QDs) in a GaAs p-i-n structure are studied. The aim is to isolate the InAs QDs from the GaAs conduction band by surrounding them with wider band gap aluminium arsenide. An increase in open circuit voltage (V<sub>OC</sub>) and decrease in short circuit current (J<sub>sc</sub>) is observed, causing no overall change in power conversion efficiency. Dark current - vol
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38

Ruiz, Preciado Marco Alejandro. "Synthèse, caractérisation et réponse photocatalytique des oxydes semi-conducteurs à base de NiTiO3." Thesis, Le Mans, 2016. http://www.theses.fr/2016LEMA1037/document.

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Structures semi-conductrices à base de NiTiO3, et l'étude de leurs propriétés dans le but de les appliquer en photocatalyse. Une étude théorique et des simulations numériques ont été effectuées pour analyser les propriétés électroniques, vibrationnelles et optiques de NiTiO3 massif ou sous forme de clusters nanométriques. Les poudres NiTiO3 ont été synthétisées par sol-gel par réaction en phase solide, tandis que les films minces ont été obtenus par pulvérisation cathodique rf-magnétron. Les caractérisations de leurs propriétés physiques confirment l'obtention de NiTiO3 polycristallin dans sa
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39

Vargas, Hernandez Jesus. "Structural and Morphological modification of TiO2 doped metal ions and investigation of photo-induced charge transfer processes." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1018/document.

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Le travail de thèse porte sur les méthodes de synthèse de nanostructures de dioxyde de titane et de leurs études physicochimiques afin de préciser les corrélations entre la morphologie, le dopage métallique, les caractéristiques structurales avec l'efficacité photocatalytique. Le grand intérêt pour les nanomatériaux TiO2 réside dans la mise au point de nouvelles sources d'énergie ou la conservation de l’environnement par des processus photocatalytiques. Cependant, la limitation principale de TiO2 est du au large gap électronique (eV ~3,2) du polymorphe Anatase. Ainsi, un des objectifs importan
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40

Yuvaraj, D. "Studies On The Growth And Characterization Of II-VI Semiconductor Nanostructures By Evaporation Methods." Thesis, 2009. https://etd.iisc.ac.in/handle/2005/1037.

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In recent years, there has been growing interests on II-VI semiconductor nanostructures, which are suitable for applications in electronics and optoelectronic devices such as solar cells, UV lasers, sensors, light emitting diodes and field emission displays. II-VI semiconductor nanostructures with different morphologies such as wires, belts, rods, tubes, needles, springs, tetrapods, plates, hierarchical structures and so on, have been widely grown by vapor transport methods. However the process conditions used for the growth of nanostructures still remains incompatible for device fabrication.
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41

Yuvaraj, D. "Studies On The Growth And Characterization Of II-VI Semiconductor Nanostructures By Evaporation Methods." Thesis, 2009. http://hdl.handle.net/2005/1037.

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In recent years, there has been growing interests on II-VI semiconductor nanostructures, which are suitable for applications in electronics and optoelectronic devices such as solar cells, UV lasers, sensors, light emitting diodes and field emission displays. II-VI semiconductor nanostructures with different morphologies such as wires, belts, rods, tubes, needles, springs, tetrapods, plates, hierarchical structures and so on, have been widely grown by vapor transport methods. However the process conditions used for the growth of nanostructures still remains incompatible for device fabrication.
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42

Triska, Joshua B. "Atomic layer deposition of nanolaminate high-κ gate dielectrics for amorphous-oxide semiconductor thin film transistors". Thesis, 2011. http://hdl.handle.net/1957/21720.

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Nanolaminate dielectrics combine two or more insulating materials in a many-layered film. These structures can be made to significantly outperform films composed of a single one of their constituent materials by adjusting the composition ratio, arrangement, and size of the component layers. In this work, atomic layer deposition (ALD) is used to fabricate pure-oxide and nanolaminate dielectrics based upon Al₂O₃ and ZrO₂. The relative performance of these dielectrics is investigated with respect to application as gate dielectrics for ZnSnO (ZTO) and InGaZnO (IGZO) amorphous-oxide-semiconductor (
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43

Leelavati, A. "Nanostructured Hybrids with Engineered Interfaces for Efficient Electro, Photo and Gas Phase Catalytic Reactions." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3849.

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Catalysis using nanostructures has been a topic of substantial interest for fundamental studies and for practical applications in energy and environmental sectors. The growing demand for production of energy and in the cleaning of polluting hazardous vehicles/industrial wastes has led to several studies in catalysis. Despite the substantial growth of heterogeneous catalytic technologies in last decade, they are still far from reaching their full potential in terms of efficiency, selectivity as well as durability. It is often difficult to simultaneously tackle all the mentioned issues with sing
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44

Leelavati, A. "Nanostructured Hybrids with Engineered Interfaces for Efficient Electro, Photo and Gas Phase Catalytic Reactions." Thesis, 2015. http://etd.iisc.ernet.in/2005/3849.

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Catalysis using nanostructures has been a topic of substantial interest for fundamental studies and for practical applications in energy and environmental sectors. The growing demand for production of energy and in the cleaning of polluting hazardous vehicles/industrial wastes has led to several studies in catalysis. Despite the substantial growth of heterogeneous catalytic technologies in last decade, they are still far from reaching their full potential in terms of efficiency, selectivity as well as durability. It is often difficult to simultaneously tackle all the mentioned issues with sing
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45

Nubi, Olatunbosun Owolabi. "Single and double doping of nanostructured titanium dioxide with silver and copper : structural, optical and gas-sensing properties." Thesis, 2016. http://hdl.handle.net/10386/1749.

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Thesis (Ph. D. (Physics)) -- University of Limpopo, 2016.<br>Single and double doped nanometric powders of Single and double doped nanometric powders of titanium dioxide (TiO2) were synthesised by the sol-gel process using titanium isopropoxide (TTIP) as the precursor. For comparison, an undoped sample was also prepared. The metal dopants, Ag and Cu, were used at doping levels of 5% molar weight. The samples were dried at 100°C in air and post annealing was done at 300°C, 600°C, 900°C and 1100°C. Structural characterisation of the samples was carried out by X-ray Diffraction (XRD), Raman Spe
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46

Sai, Ranajit. "Development of CMOS-Compatible, Microwave-Assisted Solution Processing of Nanostructured Zine Ferrite Films for Gigahertz Circuits." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3412.

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The development of radio frequency integrated circuits (RFICs), especially the dream of integrating analog, digital and radio frequency (RF) components on the same chip that is commonly known as System-on-a-Chip (SoC), is crucial to mobile communications of the future. Such SoC approach offers enhanced performance, greater reliability, and substantially less power consumption of integrated circuits while reducing overall physical size and thus manufacturing cost. However, the progress has been stalled by the lack of miniaturized inductor elements. Rise of unwanted parasitic effects limits down
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47

Sai, Ranajit. "Development of CMOS-Compatible, Microwave-Assisted Solution Processing of Nanostructured Zine Ferrite Films for Gigahertz Circuits." Thesis, 2013. http://etd.iisc.ernet.in/2005/3412.

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The development of radio frequency integrated circuits (RFICs), especially the dream of integrating analog, digital and radio frequency (RF) components on the same chip that is commonly known as System-on-a-Chip (SoC), is crucial to mobile communications of the future. Such SoC approach offers enhanced performance, greater reliability, and substantially less power consumption of integrated circuits while reducing overall physical size and thus manufacturing cost. However, the progress has been stalled by the lack of miniaturized inductor elements. Rise of unwanted parasitic effects limits down
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48

Benedict, Samatha. "Nanostructured Metal Oxide Semiconductor Gas Sensor." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5366.

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Gas sensors play a vital role in today’s world; be it in pollution monitoring, breath analysis, food quality monitoring or in agriculture. A variety of methods are being explored to develop reliable gas sensor systems such as optical, acoustic, electrochemical and chemical. Among these methods of gas detection, the chemical gas sensors based on conductometric change of the sensing materials; mainly semiconducting metal oxides, are gaining much attention due to their simplicity, easy fabrication and low cost. However, the metal-oxide based gas sensors still pose issues in terms of cross-sensiti
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49

Vanithakumari, S. C. "Synthesis And Characterization Of One-Dimensional Oxide Nanostructures." Thesis, 2009. https://etd.iisc.ac.in/handle/2005/962.

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Nanostructured materials especially, one-dimensional (1D) nanostructures have unique physical, chemical, mechanical properties and are the building blocks for a range of nanoscale devices. The procedure employed for the synthesis of nanostructures involves the use of sophisticated instruments or rigorous chemical reactions. The motivation of our work is to develop a strategy that is simple, cost effective and applicable to a host of oxide materials. Nanostructures of various oxides have been grown from the metal as the source material. 1D ZnO nanostructures have been obtained by simply hea
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50

Vanithakumari, S. C. "Synthesis And Characterization Of One-Dimensional Oxide Nanostructures." Thesis, 2009. http://hdl.handle.net/2005/962.

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Abstract:
Nanostructured materials especially, one-dimensional (1D) nanostructures have unique physical, chemical, mechanical properties and are the building blocks for a range of nanoscale devices. The procedure employed for the synthesis of nanostructures involves the use of sophisticated instruments or rigorous chemical reactions. The motivation of our work is to develop a strategy that is simple, cost effective and applicable to a host of oxide materials. Nanostructures of various oxides have been grown from the metal as the source material. 1D ZnO nanostructures have been obtained by simply heat
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