Дисертації з теми "Charge transfer device"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-49 дисертацій для дослідження на тему "Charge transfer device".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Beggs, Bruce Cameron. "Optical charge injection into a gallium arsenide acoustic charge transport device." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26681.
Повний текст джерелаApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Tsung, Ka Kin. "Transport and device application of triarylamine-based organic semiconductor." HKBU Institutional Repository, 2009. http://repository.hkbu.edu.hk/etd_ra/1013.
Повний текст джерелаSweedler, Jonathan VanSyckle. "The use of charge transfer device detectors and spatial interferometry for analytical spectroscopy." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184683.
Повний текст джерелаFaist, Mark Anton. "Spectroscopic studies of the charge transfer state and device performance of polymer:fullerene photovoltaic blends." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/11191.
Повний текст джерелаBaker, Mark Edwin. "Spatial and spectroscopic imaging for chemical analysis utilizing scientifically operated charge transfer device array detectors." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186603.
Повний текст джерелаPlanells, Dillundé Miquel Angel. "Design and synthesis of organic sensitizers for dye solar cells: molecular structure vs device performance." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/9054.
Повний текст джерелаThe present thesis focuses on the synthesis of organic chromophores as well as their use in optoelectronic devices, particulary in Dye Sensitized Solar Cells (DSSC). This kind of solar cell is based on a photoactive unit, a dye, anchored to a nanostructured metal-oxide semiconductor, usually TiO2, in a redox electrolyte media and sandwiched between two contact electrodes. In DSSC devices, each component (semiconductor, sensitizer and electrolyte) plays an important role in determining the final device efficiency, in a large part due to the charge transfer processes that take place at the TiO2/dye/electrolyte interface. Therefore, these charge transfer kinetics were studied using porphyrins, perylenes and donor - - acceptor organic dyes in order to understand and establish a relationship between the molecular structure and the device performance. Improved understanding of this relationship is crucial for improved molecular design of future dyes for DSSC.
Körner, Christian. "Oligothiophene Materials for Organic Solar Cells - Photophysics and Device Properties." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-121509.
Повний текст джерелаDer rasante Anstieg des Wirkungsgrads von organischen Solarzellen über die Marke von 10% war nur durch länderübergreifende Forschungsaktivitäten während der letzten Jahre möglich. Trotz der gemeinsamen Anstrengungen, die Prozesse, die zwischen der Absorption der Photonen und der Ladungsträgererzeugung liegen, genauer zu verstehen, sind einige Fragen jedoch immer noch ungelöst, z.B. wie diese Prozesse schon auf dem Reißbrett durch die gezielte Änderung bestimmter Molekülstrukturen optimiert werden können. Um dieses Ziel zu erreichen, werden in dieser Arbeit Dicyanovinyl-substituierte Oligothiophene (DCVnTs) verwendet. Diese Materialien bieten die Möglichkeit, kleine strukturelle Änderungen vorzunehmen, deren Einfluss auf die molekularen und auf die Solarzelleneigenschaften untersucht werden soll. Der Einfluss der Messtemperatur auf den Prozess der Ladungsträgertrennung wird hier an einer methylierten DCV4T-Verbindung in einer dünnen Schicht untersucht. Die bei photoinduzierter Absorptionsspektroskopie (PIA) beobachtete Aktivierung dieses Prozesses mit zunehmender Temperatur wird auf eine erhöhte Ladungsträgerbeweglichkeit zurückgeführt. Der dadurch erhöhte effektive Abstand der Ladungen an der Grenzfläche zwischen Donator (D) und Akzeptor (A) erleichtert die endgültige Trennung der Ladungsträger. Durch den Vergleich mit einer DCV6T-Verbindung wird der Zusammenhang zwischen der Aktivierungsenergie und der Beweglichkeit bekräftigt. Die kleinere Beweglichkeit äußert sich dabei in einer größeren Aktivierungsenergie. Darüber hinaus kann der Ladungsträgergenerationsprozess auch von der Molekülstruktur abhängen. In dieser Arbeit wird untersucht, wie sich die Länge von Alkylseitenketten auf die Energieniveaus der Moleküle, aber auch auf die Absorptions- und Lumineszenzeigenschaften der Materialien in reinen und in Mischschichten mit dem Akzeptor C60 äußert. Die ermittelten Unterschiede bezüglich der Molekülordnung (geordneter für kürzere Seitenketten) und der Phasengrößen in Mischschichten (größere Phasen bei kürzerer Kettenlänge) werden in der Untersuchung der Temperaturabhängigkeit der Lebensdauer von Triplettexzitonen mittels PIA-Messungen bestätigt. Für Solarzellen ist von Bedeutung, ob sich die Seitenkettenlänge auf die Wechselwirkung zwischen D und A auswirkt. Der vermutete Zusammenhang wird hier nicht bestätigt. Ein ähnlicher Photostrom für alle untersuchten Verbindungen in Solarzellen mit planaren Heteroübergängen unterstreicht diese Schlussfolgerung. Unterschiede im Wirkungsgrad werden auf Änderungen der Energieniveaus und die Morphologie in Mischschichtsolarzellen zurückgeführt. Des Weiteren wird in einer Machbarkeitsstudie der Einfluss des elektrischen Felds auf die Generationsausbeute freier Ladungsträger untersucht. Dafür werden halbtransparente Solarzellen verwendet, die es ermöglichen, PIA-Messungen in Transmissionsgeometrie durchzuführen. Als mögliche Erklärung für das Auftreten zweier Rekombinationskomponenten in der Analyse des Rekombinationsverhaltens der durch Licht erzeugten Ladungsträger werden eingefangene Ladungsträger und gebundene Ladungsträgerpaare an der D/A-Grenzfläche genannt. Das Mischverhalten von D und A kann durch ein Heizen des Substrates während des Verdampfungsprozesses eingestellt werden, was von entscheidender Bedeutung für eine weitere Steigerung des Wirkungsgrades ist. Für DCV4T:C60-Mischschichtsolarzellen wird jedoch eine Verschlechterung des Wirkungsgrads zu höheren Substrattemperaturen beobachtet. Durch optische Messungen und Methoden zur Schichtstrukturbestimmung wird dieser Effekt auf eine Umordnung der DCV4T-Kristallite für hohe Substrattemperaturen und die damit verbundene Verringerung der Absorption und damit auch des Photostroms zurückgeführt. Bei einer Substrattemperatur von 90° C sind die D- und A-Komponenten fast vollständig entmischt. Dieses Beispiel ist von besonderer Bedeutung, weil hier die Ursachen für ein Verhalten aufgezeigt werden, das entgegen den Beispielen aus der Literatur eine Abnahme des Wirkungsgrads beim Aufdampfen der aktiven Schicht auf ein geheiztes Substrat zeigt. Schließlich werden die Optimierungsschritte dargelegt, mit denen Solarzellen mit einer DCV5T-Verbindung als Donatormaterial auf einen Rekordwirkungsgrad von 7,7% gebracht werden. Dabei wird die Substrattemperatur, die Dicke der aktiven Schicht und die Transportschichten angepasst
Lefebvre, Stéphane. "Contribution à la caractérisation de l'IGBT en commutation à zéro de courant." Cachan, Ecole normale supérieure, 1994. http://www.theses.fr/1994DENS0009.
Повний текст джерелаEbenhoch, Bernd. "Organic solar cells : novel materials, charge transport and plasmonic studies." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7814.
Повний текст джерелаBILHORN, ROBERT BYERS. "ANALYTICAL SPECTROSCOPIC CAPABILITIES OF OPTICAL IMAGING CHARGE TRANSFER DEVICES." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184186.
Повний текст джерелаErhardt, Herbert J. "A novel test structure for automated measurement of charge transfer efficiency in charge coupled imaging devices /." Online version of thesis, 1991. http://hdl.handle.net/1850/11267.
Повний текст джерелаKenney, James Stevenson. "Modeling heterostructure acoustic charge transport devics for perfomance and manufacturability." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/13900.
Повний текст джерелаHuang, Zhongjie. "Investigation of Interfacial Charge Transfer Processes in Energy Conversion Devices." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448663899.
Повний текст джерелаDeCecca, Michael. "A low cost charging system for the electrophotographic process /." Online version of thesis, 1990. http://hdl.handle.net/1850/11192.
Повний текст джерелаChun, Young Tea. "Charge transfer characteristic of zinc oxide nanowire devices and their applications." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708978.
Повний текст джерелаWarren, Jeremy T. "Optimizing performance in photovoltaic devices based on conjugated poly(phenylene vinylenes)." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1144257019.
Повний текст джерелаZee, Kah Yep. "Design of the electronics and optics needed to support charge-coupled devices : a project report." Scholarly Commons, 1989. https://scholarlycommons.pacific.edu/uop_etds/2188.
Повний текст джерелаArnoux, Quentin. "Electronic and structural characterizations of a transparent conductive oxide/organic interface : towards applications for organic electronic devices." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066231/document.
Повний текст джерелаThe energy level alignment of hole-transport organic molecular solids with indium tin oxide (ITO), a transparent conducting oxide, has been characterized. The studied molecules, based on the dipyranylidene (DIP) structure, differ by the heteroatom (O, S and Se). Synchrotron photoemission electron spectroscopy has been used to determine the alignment, and we investigated the molecular orientation via X-ray absorption spectromicroscopy. By interpreting spectroscopic data in the light of DFT calculations, we found evidence of the presence of charge transfer from the molecules to the ITO, when they are in intimate contact with the substrate, at least for the O and S-DIPs. The hole injection barrier between the ITO Fermi level and the organic HOMO was obtained. Our experimental approach emphasizes the relationship between structural and electronic properties. These results were obtained during beamtimes in France (SOLEIL), Italy (ELETTRA) and Switzerland (SLS)
Chen, Yajie. "Low power small geometry building blocks for neural networks based on charge transfer devices." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501568.
Повний текст джерелаZheng, Yilong. "Characterization of Charge Transfer Processes Across Perylene Diimide/Electrode Interfaces for Organic Photovoltaic Devices." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/596140.
Повний текст джерелаThvedt, Tom Arnold 1956. "Computer model of a focal plane array." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276703.
Повний текст джерелаXu, Xiaofeng. "Piezoelectric coupling constant in epitaxial Mg-doped GaN and design of pentacene acoustic charge transfer devices." [Ames, Iowa : Iowa State University], 2007.
Знайти повний текст джерелаValenta, Christopher Ryan. "Microwave-energy harvesting at 5.8 GHz for passive devices." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52295.
Повний текст джерелаSridharan, Sriraaman. "Design and theoretical study of Wurtzite GaN HEMTs and APDs via electrothermal Monte Carlo simulation." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47526.
Повний текст джерелаAppadoo, Dominique R. T. (Dominique Rupert Thierry) 1964. "Spectral simplification techniques for high resolution fourier transform spectroscopic studies." Monash University, School of Chemistry, 2002. http://arrow.monash.edu.au/hdl/1959.1/7746.
Повний текст джерелаBizzarri, Didier. "Compact air separation system for space launcher." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210488.
Повний текст джерелаThe project is described from original base ideas to design, construction, extended testing and analysis of experimental results. Preliminary computations for a realistic layout have been performed and the motivations for the choices made during the process are explained. Test rig design, separator design and technical discussion are provided for a subscale pilot unit. Mass transport parameters and flooding limits have been estimated and experimentally measured. Performance has been assessed and shown to be sufficient for the reference Two Stage To Orbit vehicles. The technology developed is found suitable without further optimization, although some volume and mass reduction would be desirable for the supersonic first stage concept. There are many ways of optimisation that can be further investigated. The aim of this program, however, is not to fully optimize the device, but to demonstrate that a device based on a simple, robust, low-risk design is already suitable for the launch vehicles. On top of that analysis, directions for improvements are suggested and their potentials estimated. A complete assessment of those improvements requires further maturation of the technological concept through further testing and practical implementations.
Directions for future work, general conclusions and a vehicle development roadmap have also been provided.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Radspinner, David Andrew 1965. "Developments in atomic analysis and imaging utilizing scientific charge-transfer devices: Axial viewing of the inductively coupled plasma, advanced hollow cathode designs, and latent fingerprint imaging." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282524.
Повний текст джерелаMahmood, Paracha Ayyaz. "Design and fabrication of Mems-based, vibration powered energy harvesting device using electrostatic transduction." Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00584339.
Повний текст джерелаMalan, Daniel Johannes. "Latent heat thermal energy storage for solar water heating using flat heat pipes and aluminum fins as heat transfer enhancers." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96140.
Повний текст джерелаENGLISH ABSTRACT: Solar energy is a time dependent, high-temperature radiant energy resource. The utility of a solar thermal energy system increases if the hot temperature source is available when it is needed most. This is realized by the thermal storage of the solar energy. Thermal storage gives greater versatility to a solar energy system by decoupling the heat source from the heat sink. A large quantity of energy may be stored during the melting process in a phase change material (PCM) within a small temperature range. This molten PCM can then deliver its absorbed heat at a constant temperature in a heating application. In this study a phase change storage system (PCS) is developed and proposed for a solar water heating application. This PCS system stores more heat per unit mass than would be possible with water across the same temperature range. The heat transfer rate in and out of many PCMs is slow because of the low thermal conductivity of the PCM. However, heat transfer enhancers (HTE), such as heat pipes and fins may be added to enhance heat absorption and heat removal rates. Heat pipes have the inherent capability to transfer heat at high rates across large distances, even where the temperature difference is small. In this thesis a description is given of a PCS system consisting of paraffin wax as the PCM and which uses rectangular heat pipes in conjunction with aluminium fins to enhance heat transfer. The storage design is modular and each module has the characteristic that enhanced heat transfer in and out of the PCM is possible when the module is heated or cooled. It also has the capability to quickly absorb or alternatively to supply heat at a nearly constant temperature during the phase change of the module. A rectangular module was designed and built. The module was then analysed under controlled heat absorption and heat removal cycles. The heat up experiment involved an electrical kettle as the hot temperature source. The heat sink was a mains water heat exchanger. The experimental results were compared to those of a transient numerical model, which calculates theoretically how the module will perform thermally under the given test conditions. The numerical model of the experimental set-up was validated when it was found that the numerical model results resemble the experimental results. The numerical model was then adapted to simulate a novel solar water heater (SWH) with an additional PCS container. The improvement over previous designs is that the additional storage container can be heated to a higher temperature than the allowable geyser temperature. The system also heats up and cools down at a faster rate than would be possible without the HTEs. From the numerical simulation the size and performance of such a system is determined. This numerical analysis indicated that a phase change storage system in a SWH application will increase the hot water delivered by a given solar collector and geyser by increasing the storage capacity and by heating up the geyser overnight for early morning hot water use.
AFRIKKANSE OPSOMMING: Son energie is ‘n tyd afhanklike, hoë temperatuur radiasie energiebron. Die bruikbaarheid van ‘n sontermiese energie sisteem verhoog indien die hoë temperatuur bron beskikbaar is wanneer dit die meeste benodig word. Dit kan verwesenlik word deur die sonenergie termies te stoor. Termiese storing bied groter veelsydigheid aan ‘n sontermiese stelsel deur effektief die hittebron te ontkoppel van die hitte sink. ‘n Groot hoeveelheid energie kan, gedurende die smeltingsproses in ‘n faseveranderingsmateriaal binne ‘n nou temperatuurband gestoor word. Hierdie gesmelte materiaal kan weer op sy beurt in die waterverhittingstoepassing, die geabsorbeerde hitte teen ‘n konstante temperatuur oordra. In hierdie studie word ‘n sonwaterverwarmer stelsel wat aangepas is deur ‘n addisionele latente hittestoor daaraan te heg, voorgestel. Hierdie faseverandering hittestoor kan meer hitte stoor as wat water in dieselfde temperatuur band sou kon. Die hitteoordrag tempo na en van baie van die faseveranderingsmateriale (FVM) is egter as gevolg van die lae termiese geleidingskoëfisient, stadig. Hierdie eienskap kan gelukkig verbeter word deur hittepype en hitteoordrag verhogings materiaal soos vinne by te voeg. Hittepype het die inherente eienskap om hitte teen ‘n hoë tempo oor groot afstande, oor te dra, selfs oor ‘n klein temperatuurverskil. In hierdie tesis word ‘n ondersoek rakende ‘n faseverandering storingsisteem wat bestaan uit paraffien was as die FVM en reghoekige hittepype wat te same met met aluminium finne gebruik word om die hitteoordragtempo te verhoog, beskryf. Die stoorontwerp is modulêr en elke module het die kenmerk van hoë hitteoordrag na en van die FVM. Die module het verder ook die eienskap om vining hitte te absorbeer of hitte af te gee. Dit gebeur teen ‘n konstante temperatuur gedurende die faseverandering van die FVM. Presies so ‘n reghoekige module is ontwerp en gebou en onder beheerde hitte absorbering- en hitte verwyderingsiklusse analiseer. Tydens die verhittings eksperiment is ‘n elektriese ketel van gebruik gemaak wat gedien het as die hoë temperatuur bron. Die hitte sink was ‘n hitteruiler wat kraanwater van ‘n konstante hoogte tenk ontvang het. Die resultate van die volledige toets is met die resultate van tydafhanklike numeriese model vergelyk. Hierdie numeriese model bereken teoreties wat die module se storing verrigting onder gegewe toets omstandighede sal wees. Die numeriese model se resultate het goed vergelyk met die resultate van die eksperimente. Die numeriese model van die module is toe aangepas om ‘n sonwaterverwarmer met addisionele stoortenk wat fase verandering materiaal gebruik, te simuleer. Hierdie ontwerp is anders as vorige ontwerpe in die sin dat hoër temperature as wat die warmwatertoestel kan hanteer, in die faseverandering storingstenk, bereik kan word. Die sisteem kan ook as gevolg van die hitteoordrag verhoging materiaal, vinniger verhit of afkoel en teen ‘n vinniger tempo. Die simulasie van die sonwaterverwarmer met FVM word gebruik om die grootte en verrigting van die sisteem te bepaal. Hierdie numeriese model toon aan dat wanneer ‘n addisionele faseverandering storingstelsel in ‘n sonwaterverwarmer toepassing gebruik word, die warm water wat die verbruiker uit die sisteem kan verkry, kan verhoog. Die rede hiervoor is dat meer hitte gestoor kan word, wat beskikbaar gemaak word aan die warm water tenk.
Kotze, Johannes Paulus. "Thermal energy storage in metallic phase change materials." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96049.
Повний текст джерелаENGLISH ABSTRACT: Currently the reduction of the levelised cost of electricity (LCOE) is the main goal of concentrating solar power (CSP) research. Central to a cost reduction strategy proposed by the American Department of Energy is the use of advanced power cycles like supercritical steam Rankine cycles to increase the efficiency of the CSP plant. A supercritical steam cycle requires source temperatures in excess of 620°C, which is above the maximum storage temperature of the current two-tank molten nitrate salt storage, which stores thermal energy at 565°C. Metallic phase change materials (PCM) can store thermal energy at higher temperatures, and do not have the drawbacks of salt based PCMs. A thermal energy storage (TES) concept is developed that uses both metallic PCMs and liquid metal heat transfer fluids (HTF). The concept was proposed in two iterations, one where steam is generated directly from the PCM – direct steam generation (DSG), and another where a separate liquid metal/water heat exchanger is used – indirect steam generation, (ISG). Eutectic aluminium-silicon alloy (AlSi12) was selected as the ideal metallic PCM for research, and eutectic sodium-potassium alloy (NaK) as the most suitable heat transfer fluid. Thermal energy storage in PCMs results in moving boundary heat transfer problems, which has design implications. The heat transfer analysis of the heat transfer surfaces is significantly simplified if quasi-steady state heat transfer analysis can be assumed, and this is true if the Stefan condition is met. To validate the simplifying assumptions and to prove the concept, a prototype heat storage unit was built. During testing, it was shown that the simplifying assumptions are valid, and that the prototype worked, validating the concept. Unfortunately unexpected corrosion issues limited the experimental work, but highlighted an important aspect of metallic PCM TES. Liquid aluminium based alloys are highly corrosive to most materials and this is a topic for future investigation. To demonstrate the practicality of the concept and to come to terms with the control strategy of both proposed concepts, a storage unit was designed for a 100 MW power plant with 15 hours of thermal storage. Only AlSi12 was used in the design, limiting the power cycle to a subcritical power block. This demonstrated some practicalities about the concept and shed some light on control issues regarding the DSG concept. A techno-economic evaluation of metallic PCM storage concluded that metallic PCMs can be used in conjunction with liquid metal heat transfer fluids to achieve high temperature storage and it should be economically viable if the corrosion issues of aluminium alloys can be resolved. The use of advanced power cycles, metallic PCM storage and liquid metal heat transfer is only merited if significant reduction in LCOE in the whole plant is achieved and only forms part of the solution. Cascading of multiple PCMs across a range of temperatures is required to minimize entropy generation. Two-tank molten salt storage can also be used in conjunction with cascaded metallic PCM storage to minimize cost, but this also needs further investigation.
AFRIKAANSE OPSOMMING: Tans is die minimering van die gemiddelde leeftydkoste van elektrisiteit (GLVE) die hoofdoel van gekonsentreerde son-energie navorsing. In die kosteverminderingsplan wat voorgestel is deur die Amerikaanse Departement van Energie, word die gebruik van gevorderde kragsiklusse aanbeveel. 'n Superkritiese stoom-siklus vereis bron temperature hoër as 620 °C, wat bo die 565 °C maksimum stoor temperatuur van die huidige twee-tenk gesmelte nitraatsout termiese energiestoor (TES) is. Metaal fase veranderingsmateriale (FVMe) kan termiese energie stoor by hoër temperature, en het nie die nadele van soutgebaseerde FVMe nie. ʼn TES konsep word ontwikkel wat gebruik maak van metaal FVM en vloeibare metaal warmteoordrag vloeistof. Die konsep is voorgestel in twee iterasies; een waar stoom direk gegenereer word uit die FVM (direkte stoomopwekking (DSO)), en 'n ander waar 'n afsonderlike vloeibare metaal/water warmteruiler gebruik word (indirekte stoomopwekking (ISO)). Eutektiese aluminium-silikon allooi (AlSi12) is gekies as die mees geskikte metaal FVM vir navorsingsdoeleindes, en eutektiese natrium – kalium allooi (NaK) as die mees geskikte warmteoordrag vloeistof. Termiese energie stoor in FVMe lei tot bewegende grens warmteoordrag berekeninge, wat ontwerps-implikasies het. Die warmteoordrag ontleding van die warmteruilers word aansienlik vereenvoudig indien kwasi-bestendige toestand warmteoordrag ontledings gebruik kan word en dit is geldig indien daar aan die Stefan toestand voldoen word. Om vereenvoudigende aannames te bevestig en om die konsep te bewys is 'n prototipe warmte stoor eenheid gebou. Gedurende toetse is daar bewys dat die vereenvoudigende aannames geldig is, dat die prototipe werk en dien as ʼn bevestiging van die konsep. Ongelukkig het onverwagte korrosie die eksperimentele werk kortgeknip, maar dit het klem op 'n belangrike aspek van metaal FVM TES geplaas. Vloeibare aluminium allooie is hoogs korrosief en dit is 'n onderwerp vir toekomstige navorsing. Om die praktiese uitvoerbaarheid van die konsep te demonstreer en om die beheerstrategie van beide voorgestelde konsepte te bevestig is 'n stoor-eenheid ontwerp vir 'n 100 MW kragstasie met 15 uur van 'n TES. Slegs AlSi12 is gebruik in die ontwerp, wat die kragsiklus beperk het tot 'n subkritiese stoomsiklus. Dit het praktiese aspekte van die konsep onderteken, en beheerkwessies rakende die DSO konsep in die kollig geplaas. In 'n tegno-ekonomiese analise van metaal FVM TES word die gevolgtrekking gemaak dat metaal FVMe gebruik kan word in samewerking met 'n vloeibare metaal warmteoordrag vloeistof om hoë temperatuur stoor moontlik te maak en dat dit ekonomies lewensvatbaar is indien die korrosie kwessies van aluminium allooi opgelos kan word. Die gebruik van gevorderde kragsiklusse, metaal FVM stoor en vloeibare metaal warmteoordrag word net geregverdig indien beduidende vermindering in GLVE van die hele kragsentrale bereik is, en dit vorm slegs 'n deel van die oplossing. ʼn Kaskade van verskeie FVMe oor 'n reeks van temperature word vereis om entropie generasie te minimeer. Twee-tenk gesmelte soutstoor kan ook gebruik word in samewerking met kaskade metaal FVM stoor om koste te verminder, maar dit moet ook verder ondersoek word.
Wasem, Klein Felipe. "Photoactive polymer – carbon nanotubes hybrid nanostructures." Thesis, Strasbourg, 2021. http://www.theses.fr/2021STRAE004.
Повний текст джерелаThe objective of this thesis is the preparation of conjugated polymers (P3HT and a derivated copolymer) – carbon nanotubes hybrid materials and their characterization through different spectroscopies and transmission electron microscopy. Non-covalent nanohybrids can be obtained by sonicating both components together in THF. The interaction between both components leads to the wrapping of the polymer around the carbon nanotubes as well as the formation of polymer aggregates on the surface of the nanotubes. The effect of different parameters such as the polymer chain length are described. Covalent nanohybrids can be obtained using a specially designed copolymer bearing an aniline at the end of its side chain. Optical and Raman spectroscopies indicate a low level of functionalization, and suggest that the polymer chains are in a more disordered state compared to non-covalent nanohybrids. Preliminary studies show that the obtained copolymer can be used for functionalizing carbon nanotube based devices. Modification of electrical properties of the devices were small and compatible with the low functionalization degree, but the induced defects allow observation of a photocurrent
Fall, Sadiara. "Etude du transport de charges dans les polymères semi-conducteurs à faible bande interdite et de son impact sur les performances photovoltaïques." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00975750.
Повний текст джерелаUhrich, Pierre. "Etude prospective d'un processeur optique en lumiere incoherente pour le traitement temps reel des donnees de radar a vision laterale." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13189.
Повний текст джерелаDing, Hao. "Spectres optiques de diodes laser : methodes d'analyse des spectres, modelisation physique." Paris 11, 1988. http://www.theses.fr/1988PA112259.
Повний текст джерелаNicoletti, Nathalie. "Contrôle dimensionnel par vision : Une application à des pièces découpées sur presses à grand débit." Besançon, 1988. http://www.theses.fr/1988BESA2036.
Повний текст джерелаPaubert, Gabriel. "Instrumentation pour le radiotélescope de 30 mètres de l'IRAM et observations d'atmosphères planétaires." Phd thesis, Université Joseph Fourier (Grenoble), 1992. http://tel.archives-ouvertes.fr/tel-00688090.
Повний текст джерелаDi, Renzo Antonio. "Sviluppo di metodologie per la qualifica di componenti mediante termoelasticità." Doctoral thesis, Università degli studi di Padova, 2007. http://hdl.handle.net/11577/3425002.
Повний текст джерелаYong, Chaw Keong. "Ultrafast carrier dynamics in organic-inorganic semiconductor nanostructures." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:b2efdc6a-1531-4d3f-8af1-e3094747434c.
Повний текст джерелаChen, Chih-Yu, and 陳智裕. "Device-under-charge in Wireless Power Transfer System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/s8ep54.
Повний текст джерелаKörner, Christian. "Oligothiophene Materials for Organic Solar Cells - Photophysics and Device Properties." Doctoral thesis, 2012. https://tud.qucosa.de/id/qucosa%3A27133.
Повний текст джерелаDer rasante Anstieg des Wirkungsgrads von organischen Solarzellen über die Marke von 10% war nur durch länderübergreifende Forschungsaktivitäten während der letzten Jahre möglich. Trotz der gemeinsamen Anstrengungen, die Prozesse, die zwischen der Absorption der Photonen und der Ladungsträgererzeugung liegen, genauer zu verstehen, sind einige Fragen jedoch immer noch ungelöst, z.B. wie diese Prozesse schon auf dem Reißbrett durch die gezielte Änderung bestimmter Molekülstrukturen optimiert werden können. Um dieses Ziel zu erreichen, werden in dieser Arbeit Dicyanovinyl-substituierte Oligothiophene (DCVnTs) verwendet. Diese Materialien bieten die Möglichkeit, kleine strukturelle Änderungen vorzunehmen, deren Einfluss auf die molekularen und auf die Solarzelleneigenschaften untersucht werden soll. Der Einfluss der Messtemperatur auf den Prozess der Ladungsträgertrennung wird hier an einer methylierten DCV4T-Verbindung in einer dünnen Schicht untersucht. Die bei photoinduzierter Absorptionsspektroskopie (PIA) beobachtete Aktivierung dieses Prozesses mit zunehmender Temperatur wird auf eine erhöhte Ladungsträgerbeweglichkeit zurückgeführt. Der dadurch erhöhte effektive Abstand der Ladungen an der Grenzfläche zwischen Donator (D) und Akzeptor (A) erleichtert die endgültige Trennung der Ladungsträger. Durch den Vergleich mit einer DCV6T-Verbindung wird der Zusammenhang zwischen der Aktivierungsenergie und der Beweglichkeit bekräftigt. Die kleinere Beweglichkeit äußert sich dabei in einer größeren Aktivierungsenergie. Darüber hinaus kann der Ladungsträgergenerationsprozess auch von der Molekülstruktur abhängen. In dieser Arbeit wird untersucht, wie sich die Länge von Alkylseitenketten auf die Energieniveaus der Moleküle, aber auch auf die Absorptions- und Lumineszenzeigenschaften der Materialien in reinen und in Mischschichten mit dem Akzeptor C60 äußert. Die ermittelten Unterschiede bezüglich der Molekülordnung (geordneter für kürzere Seitenketten) und der Phasengrößen in Mischschichten (größere Phasen bei kürzerer Kettenlänge) werden in der Untersuchung der Temperaturabhängigkeit der Lebensdauer von Triplettexzitonen mittels PIA-Messungen bestätigt. Für Solarzellen ist von Bedeutung, ob sich die Seitenkettenlänge auf die Wechselwirkung zwischen D und A auswirkt. Der vermutete Zusammenhang wird hier nicht bestätigt. Ein ähnlicher Photostrom für alle untersuchten Verbindungen in Solarzellen mit planaren Heteroübergängen unterstreicht diese Schlussfolgerung. Unterschiede im Wirkungsgrad werden auf Änderungen der Energieniveaus und die Morphologie in Mischschichtsolarzellen zurückgeführt. Des Weiteren wird in einer Machbarkeitsstudie der Einfluss des elektrischen Felds auf die Generationsausbeute freier Ladungsträger untersucht. Dafür werden halbtransparente Solarzellen verwendet, die es ermöglichen, PIA-Messungen in Transmissionsgeometrie durchzuführen. Als mögliche Erklärung für das Auftreten zweier Rekombinationskomponenten in der Analyse des Rekombinationsverhaltens der durch Licht erzeugten Ladungsträger werden eingefangene Ladungsträger und gebundene Ladungsträgerpaare an der D/A-Grenzfläche genannt. Das Mischverhalten von D und A kann durch ein Heizen des Substrates während des Verdampfungsprozesses eingestellt werden, was von entscheidender Bedeutung für eine weitere Steigerung des Wirkungsgrades ist. Für DCV4T:C60-Mischschichtsolarzellen wird jedoch eine Verschlechterung des Wirkungsgrads zu höheren Substrattemperaturen beobachtet. Durch optische Messungen und Methoden zur Schichtstrukturbestimmung wird dieser Effekt auf eine Umordnung der DCV4T-Kristallite für hohe Substrattemperaturen und die damit verbundene Verringerung der Absorption und damit auch des Photostroms zurückgeführt. Bei einer Substrattemperatur von 90° C sind die D- und A-Komponenten fast vollständig entmischt. Dieses Beispiel ist von besonderer Bedeutung, weil hier die Ursachen für ein Verhalten aufgezeigt werden, das entgegen den Beispielen aus der Literatur eine Abnahme des Wirkungsgrads beim Aufdampfen der aktiven Schicht auf ein geheiztes Substrat zeigt. Schließlich werden die Optimierungsschritte dargelegt, mit denen Solarzellen mit einer DCV5T-Verbindung als Donatormaterial auf einen Rekordwirkungsgrad von 7,7% gebracht werden. Dabei wird die Substrattemperatur, die Dicke der aktiven Schicht und die Transportschichten angepasst.:Abstract - Kurzfassung Publications Contents 1 Introduction 2 Elementary Processes in Organic Semiconductors 2.1 Introduction 2.2 Optical Excitations in Organic Materials 2.2.1 Introduction 2.2.2 Radiative Processes: Absorption and Emission 2.2.3 Non-radiative Relaxation Processes 2.2.4 Triplet Excitons and Intersystem Crossing 2.3 Polarization Effects and Disorder 2.4 Transport Processes in Disordered Organic Materials 2.4.1 Charge Transport 2.4.1.1 The Bässler Model 2.4.1.2 Marcus Theory for Electron Transfer 2.4.1.3 Small Polaron Model 2.4.1.4 Functional Dependencies of the Charge Carrier Mobility 2.4.2 Diffusive Motion 2.4.3 Exciton Transfer Mechanisms 2.4.4 Characteristics of Exciton Diffusion 2.5 Charge Photogeneration in Pristine Materials 3 Organic Photovoltaics 3.1 General Introduction to Solar Cell Physics 3.2 Introduction to the Donor/Acceptor Heterojunction Concept 3.3 The Open-Circuit Voltage in Organic Solar Cells 3.4 Doping of Organic Semiconductors 3.5 Introduction to the p-i-n Concept 3.6 Charge Transfer Excitons in Donor/Acceptor Heterojunction Systems 3.6.1 Introduction 3.6.2 Verification of Charge Transfer Excitons in Donor/Acceptor Systems 3.7 The Process Cascade for Free Charge Carrier Generation in Donor/Acceptor Heterojunction Systems 3.7.1 The Initial Charge Transfer Step 3.7.2 The Binding Energy of the Charge Transfer Exciton 3.7.3 \"Hot\" Charge Transfer Exciton Dissociation 3.7.4 \"Cold\" Charge Transfer Exciton Dissociation 3.7.5 Supposed Influence Factors on Charge Transfer Exciton Dissociation 3.7.6 Recombination Pathways for Charge Transfer Excitons 3.7.7 Free Charge Carrier Formation and Recombination 4 Experimental Methods 4.1 Sample Preparation 4.2 Material Characterization Methods 4.2.1 Optical Characterization 4.2.2 Cyclic Voltammetry 4.2.3 Ultraviolet Photoelectron Spectroscopy 4.2.4 Atomic Force Microscopy 4.2.5 Grazing Incidence X-Ray Diffraction 4.2.6 Organic Field-Effect Transistor 4.3 Photoinduced Absorption Spectroscopy 4.3.1 Introduction 4.3.2 Derivation of the PIA Signal 4.3.3 Recombination Dynamics 4.3.4 Intensity Dependence of the PIA Signal 4.4 Solar Cell Characterization 4.4.1 External Quantum Efficiency 4.4.2 Spectral Mismatch Correction 4.4.3 Current-Voltage Characteristics 4.4.4 Optical Device Simulations 4.4.5 Optical Device Transmission Measurements 5 The Oligothiophene Material System 5.1 Introduction 5.2 Thermal Stability 5.3 Energy Levels 5.4 Optical Properties of the Pristine Materials 5.5 The Donor/Acceptor Couple: DCVnT and C60 5.6 Solar Cell Devices 5.7 Summary 6 Temperature Dependence of Charge Carrier Generation 6.1 Introduction 6.2 Principal Introduction to the PIA Measurements 6.2.1 Interpretation of the Spectra 6.2.2 Interpretation of the Frequency Scans 6.3 Temperature Dependence of the Spectra 6.4 Discussion of the Temperature Dependent Processes in the Blend Layer 6.5 Temperature Activated Free Charge Carrier Generation 6.5.1 Evaluation of the Activation Energy for the DCV4T-Me:C60 Blend 6.5.2 Comparison to a Sexithiophene Derivative (DCV6T-Me) 6.6 Summary 7 Side Chain Investigation on Quaterthiophene Derivatives 7.1 Energy Levels 7.2 Optical Properties 7.2.1 Solution and Pristine Films 7.2.2 Mixed Films with C60 7.3 Influence of the Side Chain Length on the Intermolecular Coupling 7.3.1 PIA Spectra of Pristine and Blend Layers at 10K 7.3.2 Recombination Analysis for Pristine and Blend Films at 10K 7.4 The Influence of the Side Chain Length on the Offset Charge Carrier Generation Rate at Low Temperature 7.5 In the High-Temperature Limit: Implications for Solar Cell Devices 7.5.1 PIA Spectra in Pristine and Blend Films at 200K 7.5.2 Recombination Analysis: Triplet Excitons and Free Charge Carriers 7.6 Solar Cells 7.6.1 Flat Heterojunction Devices 7.6.2 Bulk Heterojunction Devices 7.7 Summary 8 Electric-Field Dependent PIA Measurements on Complete Solar Cell Devices 8.1 Introduction 8.2 Semitransparent Organic Solar Cells 8.3 Photoinduced Absorption Measurements 8.4 Summary and Outlook 9 The Effect of Substrate Heating During Layer Deposition on the Performance of DCV4T:C60 BHJ Solar Cells 9.1 Introduction 9.2 The Importance of Morphology Control for BHJ Solar Cells 9.3 The Impact of Substrate Heating on DCV4T:C60 BHJ Solar Cells 9.4 Absorption and Photoluminescence 9.5 Topographical Investigations (AFM) 9.6 X-ray Investigations 9.6.1 1D GIXRD Measurements 9.6.2 2D GIXRD Measurements 9.7 Proposed Morphological Picture and Confirmation Measurements 9.7.1 Morphology Sketch of the DCV4T:C60 Blend Layer 9.7.2 Confirmation Measurements 9.8 The Equivalence of Temperature and Time 9.9 Summary 10 Record Solar Cells Using DCV5T-Me33 as Donor Material 10.1 Introduction 10.2 The Influence of the Substrate Temperature 10.3 Determination of the Optical Constants 10.4 Stack Optimization 10.5 Summary and Outlook 11 Conclusions and Outlook 11.1 Summary of the Photophysical Investigations 11.2 Summary of Device Investigations 11.3 Future Challenges Appendix A Detailed Description of the Experimental Setup for PIA Spectroscopy Appendix B Determination of the Triplet Level by Differential PL Measurements Appendix C Additional Tables and Figures Appendix D Reproducibility of the Solar Cell Results (Statistics) Appendix E Lists Bibliography Acknowledgments
Wu, Bin-Chang, and 吳炳昌. "Theoretical Analysis for Charge Transfer and Fringing Field Effects of Charge-Coupled Devices." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/12704831058245490945.
Повний текст джерела國立交通大學
電子研究所
82
Presented here is an analysis simulation tool for Charge- coupled devices(CCD), including charge capacity model and charge transfer inefficiency analytical model with and without considering effective fat zero (dark current). The surface potential with no minority carrier in our simulation is so easy to get by Fourier series, without using numerical method and the CPU time is very greatly reduced. We firstly propose a simple charge capacity model to simulate signal-charge distribution and verified by numerical results. And we propose a new method to determine the minimum fringing field from the final time constant. By this new method and charge-signal distribution we can explain the controversy of the result of the short gate length. In addition, simulation results shows that a trade-off between the transfer efficiency and the magnitude of signal charge due to the charge screening effect. Finally, a analytical model of wide range temperature is proposed and simulation results matches the experimental data very good. By this model, we can obtain a complete energy- dependent interface state distribution.
Satel, Abdallah Toni. "Wireless Charger for Low Power Devices." Master's thesis, 2016. http://hdl.handle.net/10316/81646.
Повний текст джерелаWireless power transfer technology has been widely used in many areas. This thesis implements a wireless charging system for consumer electronics for mobile applications such as laptops and tablets. The working on a wireless power transfer system is comparable to that of an air core transformer with the leakage compensated by means of capacitances. Compensation has been applied to both the primary and secondary of the transformer. This would help boost power transfer. Theoretically described the basic series-series compensation topology used. The resonant wireless power transfer is demonstrated in this thesis. The efficiency of such a system is analyzed and the results are promising, however, there are significant opportunities for improvement.This thesis consists of five chapters:chapter 1 is talking about the history, classification and applications of wireless power transfer. Chapter 2 is talking about Introduction about the fundamentals of wireless power transfer system, the theoretical study of the compensation topology and determines the important elements of such a system to help the design of a wireless power transfer system to be good.Chapter 3 Defines the parameters of the desired design by using Matlab codes and Matlab model simulation and comparison for the results.Chapter 4 Implement the study of the experimental system, and compare the result with its own simulated and calculated results.Chapter 5 at the end, we will see the conclusion of the project and the future work.Wireless power transfer technology has been widely used in many areas. This thesis implements a wireless charging system for consumer electronics for mobile applications such as laptops and tablets. The working on a wireless power transfer system is comparable to that of an air core transformer with the leakage compensated by means of capacitances. Compensation has been applied to both the primary and secondary of the transformer. This would help boost power transfer. Theoretically described the basic series-series compensation topology used. The resonant wireless power transfer is demonstrated in this thesis. The efficiency of such a system is analyzed and the results are promising, however, there are significant opportunities for improvement.This thesis consists of five chapters:chapter 1 is talking about the history, classification and applications of wireless power transfer. Chapter 2 is talking about Introduction about the fundamentals of wireless power transfer system, the theoretical study of the compensation topology and determines the important elements of such a system to help the design of a wireless power transfer system to be good.Chapter 3 Defines the parameters of the desired design by using Matlab codes and Matlab model simulation and comparison for the results.Chapter 4 Implement the study of the experimental system, and compare the result with its own simulated and calculated results.Chapter 5 at the end, we will see the conclusion of the project and the future work.
Wireless power transfer technology has been widely used in many areas. This thesis implements a wireless charging system for consumer electronics for mobile applications such as laptops and tablets. The working on a wireless power transfer system is comparable to that of an air core transformer with the leakage compensated by means of capacitances. Compensation has been applied to both the primary and secondary of the transformer. This would help boost power transfer. Theoretically described the basic series-series compensation topology used. The resonant wireless power transfer is demonstrated in this thesis. The efficiency of such a system is analyzed and the results are promising, however, there are significant opportunities for improvement.This thesis consists of five chapters:chapter 1 is talking about the history, classification and applications of wireless power transfer. Chapter 2 is talking about Introduction about the fundamentals of wireless power transfer system, the theoretical study of the compensation topology and determines the important elements of such a system to help the design of a wireless power transfer system to be good.Chapter 3 Defines the parameters of the desired design by using Matlab codes and Matlab model simulation and comparison for the results.Chapter 4 Implement the study of the experimental system, and compare the result with its own simulated and calculated results.Chapter 5 at the end, we will see the conclusion of the project and the future work.Wireless power transfer technology has been widely used in many areas. This thesis implements a wireless charging system for consumer electronics for mobile applications such as laptops and tablets. The working on a wireless power transfer system is comparable to that of an air core transformer with the leakage compensated by means of capacitances. Compensation has been applied to both the primary and secondary of the transformer. This would help boost power transfer. Theoretically described the basic series-series compensation topology used. The resonant wireless power transfer is demonstrated in this thesis. The efficiency of such a system is analyzed and the results are promising, however, there are significant opportunities for improvement.This thesis consists of five chapters:chapter 1 is talking about the history, classification and applications of wireless power transfer. Chapter 2 is talking about Introduction about the fundamentals of wireless power transfer system, the theoretical study of the compensation topology and determines the important elements of such a system to help the design of a wireless power transfer system to be good.Chapter 3 Defines the parameters of the desired design by using Matlab codes and Matlab model simulation and comparison for the results.Chapter 4 Implement the study of the experimental system, and compare the result with its own simulated and calculated results.Chapter 5 at the end, we will see the conclusion of the project and the future work.
"Electrical and optoelectrical studies on nanostructured devices." Thesis, 2008. http://library.cuhk.edu.hk/record=b6074671.
Повний текст джерелаIn this thesis, the single CdS nanobelt devices are fabricated successfully. The photosensitivity at 1V is up to 8 x 103 A/W and the electron mobility reaches to tens of cm/V·s. Based on these excellent optoelectronic properties, the CdS nanobelt becomes a good choice for interrogation on the charge transport characteristics on a nanometer scale. The transistor measurements show that the performance of CdS nanobelt device can be influenced by illuminations and ambient conditions, which result from the metal/CdS nanobelt contact and nanobelt surface redox reactions.
The intrinsic carrier transport characteristics in CdS nanobelt can be investigated by reconstructing of the local surface band diagram with the aid of SSPM. A ∼0.50 eV upward band bending can be obtained in the dark. The surface depletion length induced by the negative surface oxygen adsorbates is estimated to ∼66nm if a concentration of 1017 cm -3 shallow donors is assumed in the CdS nanobelt. This depletion length is close to the height of the ultra-thin CdS nanobelt. These adsorbates result in the surface depletion region expansion and the conduction channel reduction, which is responsible for the CdS conductance drop. Above the band-gap illumination or to the oxygen-deficient environment can effectively reduce the surface band bending and the depletion region, finally increase the conduction channel, which is one of the main reasons for the large photosensitivity and highly oxygen sensitivity for the single CdS nanobelt device.
To sustain Moore's law scaling trend beyond COMS, one-dimensional (1D) nanostructures, e.g. carbon nanotubes and semiconductor nanowires, are proposed to act as fundamental nanoscale blocks in the future electronic and optoelectronic devices. Therefore it is very crucial to understand the unique nature of electronic properties for 1D nanostructures in designing novel nanoelectronic devices and optimizing the device performance. In this thesis, the charge transport properties of nanostructure devices are studied. A method called photo-assisted scanning surface potential microscopy (SSPM) is developed, which yields a direct measurement of the electrostatic potential distributions across the 'biased' nanostructured device under different illumination conditions. Our efforts provide significant understanding of the nature of charge transport in nanoelectronics.
We can simply fabricate the MSM device using single CdS nanobelt. A positive Schottky barrier is found at the electrode/CdS nanobelt junction because of the unequal work function or the Fermi level pinning by the surface states. The barrier height is estimated to be 0.38 eV by fitting the temperature dependent I-V curves. A big potential drop at the junction can be visualized by SSPM. The calculated contact resistance for the electron injection is much larger than that for the CdS nanobelt, which illustrates that the transport properties of CdS nanobelt device are dominated by the charge injection process. The change in contact resistance and nanobelt resistance under the above bandgap illumination are measured by photo-assisted SSPM. The experimental results show that in the dark, the charge transport for the CdS nanobelt device is dominated by electron injection, while under high light intensity, the charge transport is governed by the intrinsic nature of CdS nanobelt.
With the aid of SPM, the charge injection and carrier transport characteristics of the individual CdS nanobelt device are systematically interrogated and comprehensively demonstrated, which are useful for designing and fabricating the nanostructured electronic and optoelectronic devices.
An, Jin.
Adviser: Jiambin Xu.
Source: Dissertation Abstracts International, Volume: 70-06, Section: B, page: 3674.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2008.
Includes bibliographical references.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts in English and Chinese.
School code: 1307.
Mzenda, Venantio Marovha. "Characterization of the electrical properties of polyaniline in the temperature range 30-450 K." Diss., 2002. http://hdl.handle.net/2263/29755.
Повний текст джерелаDissertation (MSc (Physics))--University of Pretoria, 2006.
Physics
unrestricted
Lo, Chen-Tsyr, and 羅承慈. "Enhancing the Electrical Characteristics of Organic Transistor-type Memory Devices through Interfacial Charge-Transfer Mechanism and Molecular Nanostructure." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/47939024254590616838.
Повний текст джерела國立臺灣大學
化學工程學研究所
104
Organic-field-effect-transistor (OFET) -type memory devices have been extensively studied due to their flexibility, scalability, and solution processability. Functional polymer containing semiconducting elements is considered as one of the most promising charge storage materials for organic field-effect transistors and organic-based memory devices, since it features a systematic route towards materials with novel architectures, functions, and physical properties. However, there is limited study on the correlations of the nanostructure and the electronic characteristic. In this thesis, we report the OFET memory devices using the dielectric layer of cross-linked core-shell block copolymers containing conjugating segments in the cores, and reveal the effect of both block composition and nanostructure on the memory characteristics. We further explored the random copolymers consisting of both pendant electron-donating and -withdrawing groups as charge storage layer in the OFET memory devices. In addition, for comparing with the synthetic polymer electrets, the solution-associated supramolecules are also applied in the OFET memory devices as charge storage dielectrics. The important discovery of this thesis was summarized in the follows. 1. Non-Volatile Field-Effect Transistor Memory Devices using Charge Storage Cross-Linked Core-Shell Nanoparticles as Polymer Electrets (Chapter 2): Solution processable cross-linked core-shell nanoparticles containing conjugated elements are firstly explored as charge storage materials for transistor-type (OFET) memories. These uniform nanoparticles containing cross-linked electron-donating or donor-acceptor cores presented efficient flash-type memory characteristics. The devices using donor-acceptor nanoparticles presented both electron- and hole-trapping abilities, along with the memory window of 38 V, the retention ability of over 10^4 s, and endurance of over 100 cycles. 2. Multilevel Non-Volatile Organic Transistor Memory Devices using Pendent Donor-Acceptor Random Copolymer Electrets (Chapter 3): Non-volatile transistor memories were fabricated using n-type semiconductor BPE-PTCDI and dielectric layer of non-conjugated random copolymers with pendant electron-donating 9-(4-vinylphenyl)carbazole (VPK) and electron-withdrawing 2-phenyl-5-(4-vinylphenyl)-1,3,4-oxadiazole (OXD) moieties. The pendent structure provided restricting regions with well-defined donor-acceptor interfaces, which is not happened in the case of PVPK/POXD polymer blend. The multilevel data storage and endurance characteristics obtained by applying different voltage pulses suggested that the devices using random copolymer P(VPKxOXDy) as electrets possessed ambipolar and controllable non-volatile flash-type memory behaviors even when the working voltage was as low as 10 V. 3. High-Performance Non-Volatile Transistor Memory Devices using Charge-Transfer Supramolecular Electrets (Chapter 4): Non-volatile OFET memory devices using charge-transfer (CT) supramolecules of poly(4-vinylpyridine) (P4VP) with two different chromophores, 3-(dicyanomethylidene)indan-1-one (1CN-IN) or 1,3-bis(dicyanomethylidene)indan (2CN-IN) were demonstrated. The intermolecular CT interaction effectively introduced the chromophores as charge trapping sites into the P4VP matrix, leading to a controllable flash-type memory behavior. The 2CN-IN with one more electron-withdrawing dicyanomethylene group, compared to 1CN-IN, provided a better electron-trapping ability and thus obtained a larger memory window. The device based on P4VP(2CN-IN)0.30 electret exhibited the largest memory window of 79 V with the excellent retention ability of up to 10^7 s and endurance of over 100 cycles. Our study demonstrated the significance of interfacial charge-transfer mechanism and molecular nanostructure on the charge transporting and memory characteristics for novel organic electronic devices.
Coelho, Guilherme Miguel Melo. "Wearable Integrated Devices for Sustainable Energy: Self Powered e-Cloths." Master's thesis, 2020. http://hdl.handle.net/10362/112787.
Повний текст джерелаCiobanu, Marius. "Viologen-nucleobase derivatives: building blocks for functional materials." Doctoral thesis, 2015. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2015050413190.
Повний текст джерелаBhattacharya, Pallavi. "Theoretical Studies of Energy Transport in Complex Systems." Thesis, 2014. http://etd.iisc.ernet.in/2005/3509.
Повний текст джерелаXiao, Dequan. "Molecular Design for Nonlinear Optical Materials and Molecular Interferometers Using Quantum Chemical Computations." Diss., 2009. http://hdl.handle.net/10161/1205.
Повний текст джерелаQuantum chemical computations provide convenient and effective ways for molecular design using computers. In this dissertation, the molecular designs of optimal nonlinear optical (NLO) materials were investigated through three aspects. First, an inverse molecular design method was developed using a linear combination of atomic potential approach based on a Hückel-like tight-binding framework, and the optimizations of NLO properties were shown to be both efficient and effective. Second, for molecules with large first-hyperpolarizabilities, a new donor-carbon-nanotube paradigm was proposed and analyzed. Third, frequency-dependent first-hyperpolarizabilities were predicted and interpreted based on experimental linear absorption spectra and Thomas-Kuhn sum rules. Finally, molecular interferometers were designed to control charge-transfer using vibrational excitation. In particular, an ab initio vibronic pathway analysis was developed to describe inelastic electron tunneling, and the mechanism of vibronic pathway interferences was explored.
Dissertation