Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Optoelectronic device"”.
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Compliant Epitaxy of Iii-V Compound Semiconductors for Optoelectronic Device Applications
The second technique uses a novel approach: very-low temperature molecular beam epitaxy (VLT-MBE) which involves growth of amorphous and polycrystalline materials. Using GaP and laterally oxidized AlAs materials, substrate independent DBRs were fabricated at wavelengths in both the visible …
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Wafer Bonding With Low-Temperature Grown Compound Semiconductor Materials for Optoelectronic Device Application
… I developed two methods to transfer a GaAs-based device layer on a transparent GaP substrate (for emission wavelength longer than 560 nm), which involve multiple processing techniques. One approach also includes the regrowth step, which further indicates the bonded sample can further be processed …
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Metal-assisted chemical etching of III-V semiconductors for advanced optoelectronic device fabrication
… the scaling and precise fabrication of device elements and features down to the nanometer level. Top-down fabrication modules in semiconductor processing including etching have been extensively explored and implemented for a wide variety of device structures. One of the most novel …
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Multimaterial rectifying device fibers
Electronic and optoelectronic device processing is commonly thought to be incompatible with much simpler thermal drawing techniques used in optical fiber production. The incorporation of metals, polymer insulators, and chalcogenide semiconductors into structured fibers has reversed this paradigm …
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Photodetection and Spectrometry at the Nanoscale
… across a range of scientific fields. For optoelectronic device applications these nanomaterials are particularly attractive due to their fundamental physical properties, such as dramatic environmental or photo-sensitivity, and effects arising from their sub-wavelength dimensions. …
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Large-area CVD growth of two-dimensional transition metal dichalcogenides and monolayer MoS₂ and WS₂ metal-oxide-semiconductor field-effect transistors
… for use in ultra-scaled electronic and optoelectronic devices because of their atomically-thin thickness, direct band gap, and lack of dangling bonds. Methods for large-area growth of 2D semiconducting materials are needed to bring them to practical applications. This thesis aims to …
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Direct tunneling modulation and signal mixing of semiconductor lasers
… laser invented by Feng and Holonyak is a unique device that bridges the gap between high-speed III-V compound semiconductor transistors and high-speed semiconductor lasers. In a highly integrated fashion, the transistor laser is capable of simultaneous transistor electrical operation and …
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Characterization of Local field effect in organic film using pressure technique
… levels in amorphous organic thin films for optoelectronic device applications. Compression of organic films causes a decrease in intermolecular spacing and, through solvation effects, lowers the exciton transition energy. A series of steady-state photoluminescence (PL) measurements performed …
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Hydrothermal synthesis of zinc oxide nanowire arrays for photovoltaic applications
… length, and alignment, which is important for optoelectronic device applications, has proven elusive due to lack of understanding regarding fundamental aqueous growth mechanisms at the nanoscale. Here, we utilize electron-beam lithography to template ZnO seed layers, demonstrating that seed …
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Charge carrier transport and recombination in semiconductors: Insights from statistical analysis and machine learning techniques
… with the goal of advancing next–generation optoelectronic devices, with three main thrusts explored. In Chapter 4, efficient exciton energy transport in thin Ruddlesden-Popper perovskite flakes is visualised and understood using time-resolved photoluminescence microscopy. Excitons traverse …
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Material and device aspects of semiconducting two-dimensional crystals
… are considered promising candidates for future device applications, as many have large band gaps, high carrier mobilities, and enable devices with immunity to short channel effects in addition to compatibility with silicon CMOS processes.^ In this thesis, the fundamental device implications of …
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Signal modulation and relative intensity noise properties of transistor laser and nano-cavity VCSEL
The transistor laser (TL) is a novel three-port optoelectronic device that exhibits intrinsic advantages such as fast base spontaneous recombination lifetime, high differential optical gain, and low carrier injection density. Due to these characteristics, we have demonstrated that the TL is able to …
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Hybrid plasma-semiconductor devices
… plasma bipolar junction transistor (PBJT), this optoelectronic device relies on the correspondence between the properties of a low temperature, nonequilibrium plasma and those of the electron-hole plasma in an n-type semiconductor. Coupling electrons and holes in a semiconductor and electrons and …
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Oxidative chemical vapor deposition of conductive polymers for use in novel photovoltaic device architectures
… been investigated for use in organic electronic devices. The oCVD process as well as the application of oCVD PEDOT in photovoltaic devices is described. oCVD enables the synthesis of conjugated conductive films with advantageous properties for organic optoelectronic device applications. The oCVD …
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Exploring the versatility of lead sulfide quantum dots in low-temperature, solution-processed solar cells
Solution processability and optoelectronic tunability makes lead sulfide quantum dots (PbS QDs) promising candidates for low-temperature, solution-processed thin film solar cells. Central to this thesis is the crucial role of QD surface chemistry and leveraging surface modification to prepare QDs …
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Establishing framework of quantum Monte Carlo calculation on II-V semiconductor
… semiconductors in high accuracy is necessary for optoelectronic device application. First principles calculations are the best solution for evaluating the electronic properties of material, due to accurate description of quantum mechanical behavior of electrons. However, many body interaction of …
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The design and synthesis of polymeric assemblies for materials applications : chemosensing, liquid crystal alignment and block copolymers
… materials that have advanced the development of optoelectronic device architectures; in part, due to their outstanding electronic and mechanical properties. This thesis explores the utility of rationally designed energy transfer cascades involving conjugated polymers that can be used in …
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Growth and characterization of ZnO and related nanostructures
… which makes them potential candidates for optoelectronic device applications. It is very important for various applications to be able to control morphology of low dimensionality nanostructures. In the first part of this thesis, synthesis and characterization of well aligned ZnO nanorods …
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Designing Nanomaterials For Electronic And Optoelectronic Devices Through Charge Carrier Control
… to be promising materials for electronic and optoelectronic device applications because of their unique size-dependent properties and low-cost solution processability. However, the integration of these materials into devices has been challenging due to a lack of available methods to: 1) …
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Multi-Scale Assembly Methodologies of Poly(3-Hexylthiophene) Derivative Systems for Enhanced Optoelectronic Anisotropy
… materials with numerous applications in optoelectronic devices, including organic light-emitting diodes, field-effect transistors, and photovoltaics. Because of the numerous advantages of macromolecular systems, including solution processing and mechanical flexibility, conjugated polymers …
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