Дисертації з теми "Optoelectronic and Photovoltaic"
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Lim, Swee Hoe. "Metallic nanostructures for optoelectronic and photovoltaic applications." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3365871.
Повний текст джерелаTitle from first page of PDF file (viewed August 20, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
Vallés, Pelarda Marta. "Different approaches to improve perovskite-based photovoltaic and optoelectronic devices." Doctoral thesis, Universitat Jaume I, 2022. http://dx.doi.org/10.6035/14104.2022.368259.
Повний текст джерелаPrograma de Doctorat en Ciències
Ho, Kai Wai. "Evaluation and characterization of efficient organic optoelectronic materials and devices." HKBU Institutional Repository, 2020. https://repository.hkbu.edu.hk/etd_oa/816.
Повний текст джерелаHo, Ka Wai. "Evaluation and characterization of efficient organic optoelectronic materials and devices." HKBU Institutional Repository, 2020. https://repository.hkbu.edu.hk/etd_oa/873.
Повний текст джерелаEicker, Ursula Irmgard. "Optical studies of amorphous silicon alloys for optoelectronic and photovoltaic devices." Thesis, Heriot-Watt University, 1989. http://hdl.handle.net/10399/1036.
Повний текст джерелаBRUNI, FRANCESCO. "NOVEL MATERIAL DESIGN AND MANIPULATION STRATEGIES FOR ADVANCED OPTOELECTRONIC APPLICATIONS." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/151660.
Повний текст джерелаMy PhD has been focused on organic semiconductors for photovoltaics and photodetecting applications. Initially, I worked on the control of the morphology in binary blends of small organic molecules and fullerenes using the so called latent pigment approach. Subsequently, I investigated the charge accumulation and polarization effect occurring at the interface between water and a polymeric semiconductor used as optical component in retinal prosthesis by means of inorganic colloidal nanocrystals featuring a ratiometric sensing ability for electron withdrawing agents. As a last part of the work, I focalized on the applications of these nanocrystals as ratiometric sensors for intracellular pH probing and pressure optical monitoring. Specifically, during the first part of my PhD, I worked in the field of organic photovoltaics on the morphology engineering of the active layer of small molecules bulk-heterojunction solar cells. I demonstrated a new strategy to fine tune the phase-segregation in thin films of a suitably functionalized electron donor blended with fullerene derivatives by introducing in the system a post-deposition thermally activated network of hydrogen bonds that leads to improved stability and high crystallinity. Moreover, this process increases the carrier mobility of the donor species and allows for controlling the size of segregated domains resulting in an improved efficiency of the photovoltaic devices. This work revealed the great potential of the latent hydrogen bonding strategy that I subsequently exploited to fabricate nanometric semiconductive features on the film surface by using a very simple maskless lithographic technique. To do so, I focalized a UV laser into a confocal microscope and used the objective as a “brush” to thermically induce a localized hydrogen bonding driven crystallization with diffraction limited resolution. My work on organic semiconductors continued with a study on the surface polarization driven charge separation at the P3HT/water interfaces in optoelectronic devices for biologic applications. In this work, I probed the local accumulation of positive charges on the P3HT surface in aqueous environment by exploiting the ratiometric sensing capabilities of particular engineered core/shell heterostuctures called dot-in-bulk nanocrystals (DiB-NCs). These structures feature two-colour emission due to the simultaneous recombination of their core and shell localized excitons. Importantly, the two emissions are differently affected by the external chemical environment, making DiB-NCs ideal optical ratiometric sensors. In the second part of my PhD, I, therefore, focalized on the single particle sensing application of DiB-NCs. Specifically, I used them to ratiometrically probe intracellular pH in living cells. With this aim, I studied their ratiometric response in solution by titration with an acid and a base. Subsequently, I internalized them into living human embryonic kidney (HEK) cells and monitored an externally induced alteration of the intracellular pH. Importantly, viability test on DiB-NCs revealed no cytotoxicity demonstrating their great potential as ratiometric pH probes for biologic application. Finally, I used DiB-NCs as a proof-of-concept single particle ratiometric pressure sensitive paint (r-PSP). In this application, the emission ratio between the core and the shell emission is used to determine the oxygen partial pressure and therefore the atmospheric pressure of the NC environment.
Shi, Tingting. "Optoelectronic and Defect Properties in Earth Abundant Photovoltaic Materials: First-principle Calculations." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1418391935.
Повний текст джерелаSola, Margherita. "Optoelectronic properties of LaVO3 perovskite for photovoltaic applications investigated by surface potential measurements." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10716/.
Повний текст джерелаHan, Lu. "Light Management in Photovoltaic Devices and Nanostructure Engineering in Nitride-based Optoelectronic Devices." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1486996393294605.
Повний текст джерелаGrand, Caroline. "Controlling electronic properties and morphology of isoindigo-based polymers for photovoltaic applications." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54856.
Повний текст джерелаKinder, Erich W. "Fabrication of All-Inorganic Optoelectronic Devices Using Matrix Encapsulation of Nanocrystal Arrays." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339719904.
Повний текст джерелаRodière, Jean. "Optoelectronic characterization of hot carriers solar cells absorbers." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066703/document.
Повний текст джерелаThe hot carrier solar cell is an energy conversion device where theoretical conversion efficiencies reach almost 86%. Additionally to a standard photovoltaic cell, the device allows the conversion of kinetic energy excess of photogenerated carriers into electrical energy. To achieve this, the thermalisation process must be limited and electrical energy selective contacts added. In order to determine potential absorber performances and overcome the fabrication challenge of energy selective contacts, a set-up and the related method of mapping absolute photoluminescence spectra were used. This technique allows getting quasi-Fermi levels splitting and temperature of emission, both thermodynamic quantities characteristic of the performance of the absorbers. In this study, absorbers based on InGaAsP multiquantum wells on InP substrate were used. The thermodynamic quantities are determined and allow to access at quantities such as thermalisation rate but also a thermoelectric coefficient, so-called Photo-Seebeck. The quantitative analysis of the hot carriers regime, in relevant conditions for photovoltaic is a first: the analysed device indicates a potential photovoltaic conversion over the Schockley-Queisser limit. At last, as the device is supplied with electrical contacts, electrical characterization are made and compared to optical measurements. A first simulation is proposed to better understand the thermodynamic quantities evolution as a function of the electrical bias
Kaya, Emine. "Solution Processable Benzotriazole And Fluorene Containing Copolymers For Photovoltaic Applications." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613561/index.pdf.
Повний текст джерелаVisible Spectroscopy and spectroelectrochemistry. All three polymers showed both p and n doping behaviors and multicolored electrochromic states. In order to learn switchingtimes and percent transmittance changes kinetic studies were also performed. Thermal properties of the polymers were investigated via Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). Due to the convenient HOMO and LUMO levels, band gaps, strong absorptions in the visible region and thermal stability, polymers were tested in Organic Solar Cell (OSC) device applications. The preliminary investigation indicated that polymers had promising power conversion efficiencies.
Khan, Ridita Rahman. "Modeling, Simulation and Characterization of Optoelectronic Properties of 2D-3D CoO-ATO Nano Structures." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7414.
Повний текст джерелаManda, Venkata Ramana. "Enhancing the Photovoltaic Performance of P3HT/PDIB Silsesquioxane Donor-Acceptor System Using Spray Deposition Fabrication Technique." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1336.
Повний текст джерелаWilkins, Matthew M. "Design of Multi-junction Solar Cells on Silicon Substrates Using a Porous Silicon Compliant Membrane." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24096.
Повний текст джерелаBeal, Russell Joseph. "Effects of Nanoassembly on the Optoelectronic Properties of CdTe - ZnO Nanocomposite Thin Films for Use in Photovoltaic Devices." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/283601.
Повний текст джерелаShrestha, Niraj. "Optoelectronic Properties of CdSexTe1-x, CuInSe2 and Perovskites for Photovoltaic Applications." University of Toledo / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=toledo159680306858192.
Повний текст джерелаBrombosz, Scott M. "Alkynylated acenothiadiazoles and N-heteroacenes: synthesis, functionalization, and study of the optical properties for optoelectronic and sensory materials." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37102.
Повний текст джерелаJošt, Marko [Verfasser], Marko [Akademischer Betreuer] Topič, Bernd [Gutachter] Rech, Bernd [Gutachter] Szyszka, Marko [Gutachter] Topič, and Janez [Gutachter] Trontelj. "Fabrication and characterization of nanotextures for light management in photovoltaic and optoelectronic devices / Marko Jošt ; Gutachter: Bernd Rech, Bernd Szyszka, Marko Topič, Janez Trontelj ; Betreuer: Marko Topič." Berlin : Technische Universität Berlin, 2017. http://d-nb.info/1156180805/34.
Повний текст джерелаJošt, Marko Verfasser], Marko [Akademischer Betreuer] Topič, Bernd [Gutachter] [Rech, Bernd [Gutachter] Szyszka, Marko [Gutachter] Topič, and Janez [Gutachter] Trontelj. "Fabrication and characterization of nanotextures for light management in photovoltaic and optoelectronic devices / Marko Jošt ; Gutachter: Bernd Rech, Bernd Szyszka, Marko Topič, Janez Trontelj ; Betreuer: Marko Topič." Berlin : Technische Universität Berlin, 2017. http://nbn-resolving.de/urn:nbn:de:101:1-201804162945.
Повний текст джерелаEder, Grace M. "Dye Molecule-Based Porous Organic Materials." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1530012900215452.
Повний текст джерелаShaw, Nicola Jane. "Studies of dye sensitised photovoltaic cells." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301538.
Повний текст джерелаAbdi, Jalebi Mojtaba. "Chemical modifications and passivation approaches in metal halide perovskite solar cells." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/283216.
Повний текст джерелаGRASSI, FABIO. "Ab Initio Modelling of Semiconductor Nanoparticles for Optoelectronics and Photovoltaics." Doctoral thesis, Università del Piemonte Orientale, 2014. http://hdl.handle.net/11579/115648.
Повний текст джерелаRobertson, Kyle. "Optoelectronic Device Modeling of GaAs Nanowire Solar Cells." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39710.
Повний текст джерелаОпанасюк, Анатолій Сергійович, Анатолий Сергеевич Опанасюк, Anatolii Serhiiovych Opanasiuk, Таїсія Олександрівна Бересток, Таисия Александровна Бересток, and Taisiia Oleksandrivna Berestok. "Research laboratory «optoelectronics and solar power engineering»." Thesis, Одеський національний політехнічний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/34062.
Повний текст джерелаROONEY, MILES. "Self-assembled, nanostructured organic materials for applications in electronics and optoelectronic devices." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199099.
Повний текст джерелаthe investigation of two methods for molecular control of the nano-morphology of opto-electronic devices. Firstly, a photocrosslinking method for creating insoluble semiconductor layers suitable for organic photovoltaic devices. A large series of squaraine based semiconductors are investigated in a bulk heterojunction device. This approach is extended to diketopyrrolopyrrole and naphthalene diimide semiconducting cores. Detailed study of the materials film structure is carried out. The second approach is an investigation of the applicability of latent pigments for organic opto-electronics. A series of organic photovoltaics are produced in planar bilayer and bulk heterojunction architectures. The thin film devices are tested with a variety of interlayers and processing parameters. The control of the nanostructure of these thin film devices is examined with X-ray studies. Incorporating X-ray reflectivity, Specular x-ray, Gradient temperature X-ray and grazing wide angle x-ray studies. In this manner the bulk and interfaces of thin film devices can be examined and characterised. The latent pigment approach is also applied to the field of organic field effect transistors as the active semiconducting layer. The solvent resistant nature of a parent semiconducting pigment shows a substantial benefit to the fabrication of such devices. The unique crystalline rearrangement which occurs upon deprotection of a latent pigment results in an improvement in charge carrier mobility of up to three orders of magnitude while extending the processing possibilities of the subsequent deposition steps required to complete an organic field effect transistor These two techniques are developed with the thoughts of industrial compatibility in mind. As such, a novel synthetic method for facile, cheap, and environmentally friendly production of organic semiconductors is explored. A micellar reaction environment is created through the use of the common surfactant and drug excipient Kolliphor EL. The unique oxygen free core of this surfactant offers a new environment for carrying out common cross coupling reactions such as Suzuki-Miyaura, Stille and Heck reactions in air and water at ambient temperature. High Yields of over 90% are recovered for complex organic semiconducting cores. The versatility of this approach is extended by the use of toluene as a co-solvent. This co-solvent system results in the development of an emulsion which can be used to perform complex chemistries. Emulsion chemistry offers a unique way to synthesis complex organic semiconductors with low metallic catalyst loading at high yield.
Molet, Bachs Pau. "Managing light in optoelectronic devices with resonant optical nanostructures." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/673260.
Повний текст джерелаActualmente, uno de los retos en el ámbito de la manipulación de la luz a la nanoescala es la transición del laboratorio a aplicaciones reales. A pesar del gran potencial demostrado por algunas estructuras fotónicas para incrementar la eficiencia de instrumentos optoelectrónicos, su implementación en dispositivos de mercado muchas veces es obstruida por la necesidad de utilizar técnicas de fabricación poco escalables y de alto coste. Esta tesis está dedicada al diseño e implementación de estrategias de manipulación de la luz para mejorar la eficiencia en la recolección de energía de placas solares y fotodetectores, así como la mejora de la emisión en dispositivos de iluminación, mediante métodos de nanoestructuración escalables como la nano-litografía suave. Esta técnica tiene la capacidad de producir patrones y estructures con una resolución de pocos nanómetros con gran fidelidad en áreas grandes. Encima, es compatible con el procesamiento a gran escala mediante el sistema de impresión en cadena “roll-to-roll” (carrete-a-carrete). También se trata de una tecnología muy versátil, puesto que permite el uso de diferentes tipos de sustratos, es poco invasiva y generalmente puede ser introducida en el esquema de fabricación sin tener que modificar ningún paso. Con la ayuda de esta técnica de nanofabricación, exploramos una variedad de arquitecturas fotónicas y las diferentes resonancias fotónicas que las hacen especiales. Entre estas últimas podemos encontrar resonancias de Mie, modos de Brewster y modos de cristal fotónico, que proveerán al sistema con una mayor interacción luz-materia a la capa activa del dispositivo, mejorar sus capacidades ópticas. Primero, hemos desarrollado una estrategia para conseguir una absorción óptima de banda ancha en semiconductores ultra-finos, con menos de 100 nm de grosor, para todas las energías por encima de su energía de banda prohibida. La sinergia de las fuertes resonancias de interferencia de capas finas presentes y los modos del cristal fotónico de la estructura (con un alto índice de refracción) hacen que la estructura logre hasta un 81% de absorción en un amplio rango de longitudes de omda (de 400 a 1500 nm). En segundo lugar, hemos combinado la litografía suave con la deposición química de vapor (CVD en inglés) para obtener una matriz de semiesferas de silicio sobre de una guía de ondas de alto índice de refracción. Hemos estudiado las resonancias de Mie características del sustrato, como hibridan con modos casi-guiados de la guía de olas y como esto afecta en el campo próximo de la metasuperfície. Hemos ido un paso más allá estudiando como la modificación de los parámetros del diseño de la estructura afecta a las resonancias mencionadas. Finalmente, hemos demostrado una posible aplicación como sustrato para incrementar la emisión de luz por parte de una molécula emisora. En la tercera parte de la tesis, nos hemos enfocado en la implementación de estructuras de cristal fotónico bidimensional a tres dispositivos diferentes para la mejora de su eficiencia. En particular, mejoramos la eficiencia en la recolección de fotones de infrarrojo próximo en células solares de puntos cuánticos coloidales (PbS) y en fotodetectores orgánicos (P3HT: PC60BM y PBTTT: PC70BM), y mejoramos la emisión de luz de capas de nanofósforos (nanocristales de GdVO4:Eu3+). Hemos desarrollado sistemas fotónicos adaptados a cada caso y hemos hecho una caracterización óptica y electrónica de todos los dispositivos. La nanoestructuración en forma de cristal fotónico bidimensional provee a las capas activas con propiedades de guías de onda resonantes, mejorando sus propiedades de confinamiento de la luz en las longitudes de onda deseadas, demostrando así la posibilidad de implementar las arquitecturas.
Currently, one of the main challenges in light management at the nanoscale is the transition from the laboratory to real applications. Despite the great potential shown by photonic architectures to optically improve the performance of many devices, transitioning into marketable devices is often hampered by the low-throughput and expensive nanofabrication techniques involved. This thesis is devoted to the design and development of subwavelength light managing strategies to improve the light harvesting or out-coupling in solar cells, photodetectors and light emitters while using a scalable nanostructuration such as soft nanoimprint lithography (NIL). This technique has been proven to achieve resolutions down to few tens of nanometers with high fidelity in large areas, being compatible with roll to roll processing. It is also versatile regarding the materials where it can be used, non-invasive, and can be seamlessly introduced in the devices fabrication scheme. With the aid of this technique, we explore a variety of photonic architectures and the different types of resonances sustained, from Brewster modes to Mie resonances, in order to enhance the light-matter interaction with the active layer of the device. First, we develop a strategy to achieve broadband optimal absorption in ultra-thin semiconductor materials (less than 100 nm thick) for all energies above their bandgap. The interplay of strong interference thin film resonances and photonic crystal modes sustained by a high refractive index nanostructure on a gold film renders the system with a 81% total absorption over a broad spectral range (from 400 to 1500 nm). Second, we combine soft NIL and chemical vapor deposition to obtain an array of silicon hemispheres on top of a high refractive index dielectric waveguide. We study the Mie resonances supported by the substrate, how these hybridize with the guided modes of the waveguide and how their interaction influences the electromagnetic near field of the metasurface. We further explore the tunability of such resonances with the design parameters of the structure and we demonstrate a potential application of it as a substrate for enhanced photoluminescence. In the third part of the thesis, we focus on the implementation of 2D photonic structures within the active layer of three different devices to improve performance. In particular we enhance the near infrared (NIR) photon harvesting efficiency in a colloidal quantum dot solar cell (PbS-CQD) and in organic photodetectors (P3HT: PC60BM and PBTTT: PC70BM) and improve the light out coupling from a nanophosphor layer (GdVO4:Eu3+ nanocrystals). We developed photonic systems tailored for each device and provide the complete optical and electronic characterization for each case. The nanostructuration with a 2D periodic arrangement renders the active layers with resonant waveguide properties enhancing its light trapping properties in the targeted spectral ranges, hence demonstrating the possibility to implement photonic schemes within actual devices.
Universitat Autònoma de Barcelona. Programa de Doctorat en Ciència de Materials
Sammito, Davide. "Integration of plasmonic gratings into optoelectronic devices." Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8578.
Повний текст джерелаABSTRACT This thesis deals with the control of light absorption in semiconductor devices by the plasmonic resonances of periodically arranged metallic nanostructures integrated on them. Metallic gratings support propagating (SPP) and localized (LSP) plasmonic excitations and surface plasmons-related phenomena, like Extraordinary Optical Transmission (EOT) and plasmonic band gaps, as well as conventional diffraction effects. We combine all the optical resonances outlined to tune the incoupling and distribution of incident photons in the absorbing semiconductor substrate. In particular we consider the application of these concepts to two typologies of optoelectronic devices: photovoltaic solar cells and phototransistors. In the case of photovoltaic devices the objective is to increase the energy conversion efficiency by enhancing light harvesting and re-shaping the absorption profile, in order to improve the collection of photo-generated charge carriers. We begin analyzing a case study, a one-dimensional lamellar grating placed on a silicon substrate, by numerical optical simulations. The aim is to find the coupling conditions of the resonances supported, by designing the geometric parameters of the nanostructures, and showing their impact on the generation profile. These findings are then applied for light trapping purpose to two realistic solar cell layouts. SPP and LSP resonances are able to provide high near field magnification and effectively enhance the absorption of ultrathin organic solar cells. On the other hand, EOT coupled to diffraction orders are more suited to wafer-based Si cells. Then we present the fabrication process developed to realize the designed nanostructures over the large surface area of Si photovoltaic devices. By experiments and simulation we show that an improvement of Internal Quantum Efficiency can be obtained compared to unpatterned devices. Concerning the phototransistors, the aim is use them as compact and scalable biosensors by integrating a plasmonic crystal on the active area. By simulations the grating is designed to maximize transmittance variation due the plasmon resonance shift related to the surface binding of bio-analyte molecules. This event is transduced into an electrical signal at device terminals, as confirmed by characterizations on the first prototypes fabricated. The metallic grating simultaneously works as plasmonic structure and as electronic gate of the transistor in a fully integrated architecture.
SOMMARIO In questa tesi viene trattata la tematica del controllo dell’assorbimento di luce in dispositivi a semiconduttore tramite le risonanze plasmoniche proprie di nanostrutture metalliche integrate con disposizione periodica. Reticoli metallici supportano eccitazioni plasmoniche propaganti (SPP) e localizzate (LSP) e fenomeni correlati ai plasmoni di superficie, quali la trasmissione ottica straordinaria (EOT) e la creazione band gap plasmoniche, così come effetti di diffrazione convenzionali. Tali risonanze ottiche sono state combinate per regolare l’accoppiamento e la distribuzione dei fotoni incidenti in substrati semiconduttori assorbenti. In particolare consideriamo l’applicazione di tali concetti a due tipologie di dispositivi optoelettronici: celle solari fotovoltaiche e foto-transistor. Nel caso dei dispositivi fotovoltaici, l’obiettivo è aumentare l’efficienza di conversione energetica tramite una maggiore raccolta di luce e la redistribuzione del profilo di assorbimento, in modo da migliorare la raccolta dei portatori di carica fotogenerati. L’analisi di un caso di studio, un reticolo lamellare monodimensionale posto su un substrato di silicio, tramite simulazioni ottiche per via numerica, serve a trovare le condizioni di accoppiamento delle risonanze supportate, dimensionando i parametri geometrici delle nanostrutture, e mostrare il loro impatto sul profilo di generazione. Questi risultati sono quindi applicati, per finalità di “light trapping”, a due strutture realistiche di celle solari. Le risonanze SPP e LSP sono capaci di fornire una grande intensificazione del campo vicino e aumentano efficacemente l’assorbimento di celle solari organiche ultra-sottili. D’altro canto, la combinazione di EOT e ordini di diffrazione è più adatta per celle solari spesse in Si. Quindi presentiamo il processo di fabbricazione sviluppato per realizzare le nanostrutture progettate sulle ampie superfici dei dispositivi fotovoltaici in Si. Esperimenti e simulazioni mostrano che è possibile ottenere un aumento dell’efficienza quantica interna rispetto ai dispositivi non nanostrutturati. Per quanto riguarda i foto-transistor, l’obiettivo è utilizzarli come biosensori compatti e scalabili tramite l’integrazione di cristalli plasmonici sull’area attiva. Il reticolo è stato progettato in modo da massimizzare variazioni di trasmittanza dovute alla modulazione delle risonanze plasmoniche indotta dal legame di bio-molecole sulla superficie. Questo evento è trasdotto in un segnale elettrico misurabile ai capi del dispositivo, come confermato dalle caratterizzazioni sui primi prototipi fabbricati. Il reticolo metallico funziona simultaneamente come struttura plasmonica e come gate elettronico del transistor in un’architettura totalmente integrata.
XXV Ciclo
1984
Roknuzzaman, Md. "Ab initio atomistic insights into lead-free perovskites for photovoltaics and optoelectronics." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/198196/1/Md_Roknuzzaman_Thesis.pdf.
Повний текст джерелаTorrisi, Giacomo. "Transparent Conductors based on Ag Nanolayer embedded in Semiconductor Oxides." Doctoral thesis, Università di Catania, 2019. http://hdl.handle.net/10761/4126.
Повний текст джерелаShih, Grace Hwei-Pyng. "Nanostructure and Optoelectronic Phenomena in Germanium-Transparent Conductive Oxide (Ge:TCO) Composites." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/228175.
Повний текст джерелаHolder, 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.
Повний текст джерелаKovacik, Peter. "Vacuum deposition of organic molecules for photovoltaic applications." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:98461a90-5ae3-4ae3-9245-0f825adafa72.
Повний текст джерелаBecker, Pascal [Verfasser]. "Structural and Optoelectronic Properties, Phase Transitions, and Degradation of Semiconducting CsPbI3-Perovskite Thin-Films for Photovoltaics / Pascal Becker." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/120422255X/34.
Повний текст джерелаBondi, Luca. "Photocurrent generation at organic heterojunction-electrolyte interface for optoelectronic biosensor implementation." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Знайти повний текст джерелаLini, Matilde. "Optoelectronic characterization of hybrid organic-inorganic halide perovskites for solar cell and X-ray detector applications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23213/.
Повний текст джерелаHallani, Rawad Kamal. "Designing Anthradithiophene Derivatives Suitable For Applications in Organic Electronics and Optoelectronics." UKnowledge, 2015. http://uknowledge.uky.edu/chemistry_etds/61.
Повний текст джерелаKim, Vincent Oteyi. "Ultrafast spectroscopy of organic semiconductors : singlet fission and nonfullerene acceptors for organic photovoltaics." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/283561.
Повний текст джерелаHosatte, Mikaël. "Nanostructured silicon-based metamaterial and its process of fabrication for applications in optoelectronics and energy." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAD019.
Повний текст джерелаNanostructures based on differences of crystallinity have been embedded into all-silicon test devices by innovative amorphization techniques and a new carrier multiplication mechanism was observed. This effect can indeed originate from the electron energy levels resulting from the high densities of divacancies localized at the crystalline/amorphous interfaces.An operating principle involving multiple energy level mechanisms and fast electronic transport within the unionized phosphorus energy band was also advanced. It led to a favourable asymmetry between generation and recombination of free carriers.Besides, contrary to other carrier multiplication effects, photon energy lower than twice the band gap was found sufficient to initiate the process. The enhancement of photovoltaic yields becomes therefore conceivable and propositions of prototypes are made. A new generation of high efficiency solar cells may then emerge from this Low-Energy Electron Multiplication effect
Ripollés, Sanchis Teresa. "Interfacial and Bulk Operation of Polymeric Solar Cells by Optoelectronics and Structural Techniques." Doctoral thesis, Universitat Jaume I, 2014. http://hdl.handle.net/10803/277095.
Повний текст джерелаPandolfi, Silvia. "High-pressure pathways towards new functional Si-based materials with tailored optoelectronic properties and their characterization." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS459.pdf.
Повний текст джерелаIn this work, high-pressure high-temperature treatment is used to develop and optimize synthetic pathways to new and exotic forms of silicon. The synthesis of new phases of silicon is a key point in the future development of Si-based technology, especially for solar energy. Development of new Si-based materials with high-efficiency could both optimise the performances and reduce the costs. At an industrial level, high-pressure has been mainly used for the synthesis of diamonds and super-hard materials, but recent studies have proven it also efficient in the synthesis of new silicon-based materials with enhanced properties for applications. We tackle this challenge in all its aspects, starting from the study of transition mechanisms at high-pressure and arriving to the synthesis and characterization of a new silicon material. We use in-situ x-ray diffraction at high-pressure high-temperature conditions to monitor and characterize silicon phase transitions and their dynamics. Our results give new insights that clarify some aspects of the silicon phase diagram that were still a matter of debate. We obtain the first synthesis of pure hexagonal silicon, a longstanding challenge in the field. Thanks to our pure-phase sample, we characterize its physical and structural properties. We prove that hexagonal silicon obtained from high-pressure is in the form of 4H polytype (ABCB stacking sequence). Further structural characterizations reveal a hierarchical nanostructure in the pristine morphology of the sample. Discovery and characterization of discrete quasi-2D nanoparticles accessible for manipulation opens new perspectives for the design of new optoelectronic devices
Greul, Enrico [Verfasser], and Thomas [Akademischer Betreuer] Bein. "On the way to non-toxic and highly stable perovskite-based optoelectronics : synthesis and investigations of lead-free perovskites for photovoltaic applications / Enrico Greul ; Betreuer: Thomas Bein." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/119109815X/34.
Повний текст джерелаEgo, Christophe. "Oligo and polyfluorenes of controlled architecture for applications in opto-electronics." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210958.
Повний текст джерелаThe first subject of this work deal with the design, the synthesis and the characterisation of polyfluorenes end-capped with perylene dicarboximide derivatives. These perylene moieties are able to interact by energy transfer under specific conditions of illumination, proximity and orientation. Their observation by single molecule spectroscopy permitted therefore to gain valuable information concerning the three-dimensional folding of single polyfluorene chains. To complete this study, the synthesis and characterisation of a perylene end-capped trimer of fluorene was performed. This structure being monodisperse, a finer analysis of the energy-transfer occurring between both perylene dyes could be accomplished, which confirmed the structural hypothesis made for the polymer. During these studies, it has been observed that, in addition to the energy transfer occurring between both perylene derivatives, another energy transfer occurs between the polyfluorene backbone and the perylene derivatives upon excitation of the first. This led to the idea of the synthesis of a polyfluorene bearing perylenes dicarboximide as side chains. This perylene-rich polyfluorene has been used to build a photovoltaic cell efficient in the wavelengths of both polyfluorene absorption and perylene carboximide absorption.
Another subject of this work was the design, synthesis and characterisation of polyfluorenes bearing bulky phenoxy groups as side-chains. These polymers, due to their lower tendency toward aggregation, exhibited a better stability of their emission colour upon annealing. Similarly, a series of homo- and copolymers of fluorene bearing bulky and hole accepting triphenylamine substituants was synthesised and characterised. In addition to their improved colour stability in comparison with dialkylpolyfluorenes, the LEDs build with these materials exhibited a very low turn on voltage.
Doctorat en sciences, Spécialisation chimie
info:eu-repo/semantics/nonPublished
Deng, Zeyu. "Rational design of novel halide perovskites combining computations and experiments." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/287932.
Повний текст джерелаRegrettier, Thomas. "Modulateurs de lumière à commande optique composés d'une couche photovoltaïque organique." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD038.
Повний текст джерелаThe performances of liquid crystals (LCs) based optically addressed Spatial Light Modulators (OASLMs) strongly depends on the photosensitive layer properties. To accommodate device transparency, lateral resolution and low cost production, organic semiconductors appear as the ideal candidates. We chose to use a P3HT: PCBM blend as the photosensitive layer. Our results showed that the liquid crystals reorient according to the luminous intensity alone and without external power supply. Additional measurements indicate that the photovoltaic effect is at the origin of this phenomenon. This type of device allowed spatial modulation of the LCs orientation and demonstrates its potential in holographic applications. A second type of device integrating interfacial layers of PEIE and PEDOT: PSS allowed us to control the orientation of the LCs and gives promising routes towards the design of self-sustainable OASLMs
Le, Borgne Damien. "Photovoltaïque organique : étude des interactions électroniques aux interfaces des hétérojonctions organiques." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30147/document.
Повний текст джерелаOrganic solar cells appear as a promising technology to meet future energy requirements, owing to their low production costs, their great flexibility and their ability to be integrated into light devices. Their performances rely on their architecture and the nature of the chosen materials. As a consequence, two of the key parameters for their development are the control the active layer at a nanometric scale (molecular organisation and the formation of pure compound nanodomains) and the development of new small molecules with optimized electronic and structural properties. This work comes in that aim : the study of the relation between thin film morphology and transport properties at the nanometric scale as function of the chosen materials. Two ways have been explored. The first way relied on self-organisation properties of a liquid crystal for improving the formation and organisation of nanodomains. In this purpose, we have associated a well-known electron donor, the poly-3-hexylthiophene (P3HT), with a complex of nickel, named as [Ni(4dopedt)2], exhibiting columnar liquid crystal properties. Atomic Force Microscopy (AFM), Conductive-AFM (C-AFM), UV-visible absorption and Raman spectroscopy on bulk films have shown the structuring effect of the liquid crystal on the P3HT chains as a function of the films thicknesses and thermal annealing. The second way was based on molecular engineering. Following a bibliographic study, we have designed and synthetized different fluorinated small molecules with electron acceptor capability. For this, a more economical and cleaner synthesis technique has been employed: the direct arylation. These molecules have been characterized by classical analytic technics, and a study of the relation between structure and properties has been carried out. On the one hand, optical, electrochemical and thermal analyses have shown their good stability and their potential for the aimed application. On the other hand, their study in thin film by UV-visible absorption, fluorescence and AFM have shown the influence of backbone substitution by fluorine atoms as well as the impact of the nature of alkyl end chains on the optoelectronic and structural properties of these molecules
Lepage, Hadrien. "Modélisation de solides à nanocristaux de silicium." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00753248.
Повний текст джерелаFountaine, Katherine Theresa. "Mesoscale Optoelectronic Design of Wire-Based Photovoltaic and Photoelectrochemical Devices." Thesis, 2015. https://thesis.library.caltech.edu/8928/1/Fountaine_PhDThesis_FinalComplete.pdf.
Повний текст джерелаThe overarching theme of this thesis is mesoscale optical and optoelectronic design of photovoltaic and photoelectrochemical devices. In a photovoltaic device, light absorption and charge carrier transport are coupled together on the mesoscale, and in a photoelectrochemical device, light absorption, charge carrier transport, catalysis, and solution species transport are all coupled together on the mesoscale. The work discussed herein demonstrates that simulation-based mesoscale optical and optoelectronic modeling can lead to detailed understanding of the operation and performance of these complex mesostructured devices, serve as a powerful tool for device optimization, and efficiently guide device design and experimental fabrication efforts. In-depth studies of two mesoscale wire-based device designs illustrate these principles—(i) an optoelectronic study of a tandem Si|WO3 microwire photoelectrochemical device, and (ii) an optical study of III-V nanowire arrays.
The study of the monolithic, tandem, Si|WO3 microwire photoelectrochemical device begins with development and validation of an optoelectronic model with experiment. This study capitalizes on synergy between experiment and simulation to demonstrate the model’s predictive power for extractable device voltage and light-limited current density. The developed model is then used to understand the limiting factors of the device and optimize its optoelectronic performance. The results of this work reveal that high fidelity modeling can facilitate unequivocal identification of limiting phenomena, such as parasitic absorption via excitation of a surface plasmon-polariton mode, and quick design optimization, achieving over a 300% enhancement in optoelectronic performance over a nominal design for this device architecture, which would be time-consuming and challenging to do via experiment.
The work on III-V nanowire arrays also starts as a collaboration of experiment and simulation aimed at gaining understanding of unprecedented, experimentally observed absorption enhancements in sparse arrays of vertically-oriented GaAs nanowires. To explain this resonant absorption in periodic arrays of high index semiconductor nanowires, a unified framework that combines a leaky waveguide theory perspective and that of photonic crystals supporting Bloch modes is developed in the context of silicon, using both analytic theory and electromagnetic simulations. This detailed theoretical understanding is then applied to a simulation-based optimization of light absorption in sparse arrays of GaAs nanowires. Near-unity absorption in sparse, 5% fill fraction arrays is demonstrated via tapering of nanowires and multiple wire radii in a single array. Finally, experimental efforts are presented towards fabrication of the optimized array geometries. A hybrid self-catalyzed and selective area MOCVD growth method is used to establish morphology control of GaP nanowire arrays. Similarly, morphology and pattern control of nanowires is demonstrated with ICP-RIE of InP. Optical characterization of the InP nanowire arrays gives proof of principle that tapering and multiple wire radii can lead to near-unity absorption in sparse arrays of InP nanowires.