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 23 for “"hole recombination"”.
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Characteristics, Theory and Modeling of the Transistor Laser
… of the photon and quantum-mechanical electron-hole recombination dynamics in the operation of the transistor laser. An analytical understanding of these physical characteristics is developed based on experimental data, and a computational model of the transistor laser is developed for device …
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Solar Water Oxidation by Composite Cobalt-Based Catalyst/Oxide Semiconductor Photoanodes
… eliminates losses due to surface electron-hole recombination. The low absolute onset potential achieved with Co-Pi/W:BiVO4 is promising for overall solar water splitting in low-cost tandem PEC cells, and is encouraging for application of this surface modification strategy to other candidate …
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Development and Application of Explicitly Correlated Wave Function Based Methods for the Investigation of Optical Properties of Semiconductor Nanomaterials
… a theoretical method which is called electron-hole explicitly correlated Hartee-Fock (eh-XCHF). It is a variational method for solving the electron-hole</p> <p>Schrodinger equation and has been used in this work to study electron-hole interaction in semiconductor quantum dots. The method was …
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Minority carrier lifetimes in germanium on silicon heterostructures
… directly deposited epi-Ge samples indicated that recombination at the Ge-Si interface dominated the effective lifetime. Hydrogen passivation stability of Si and Ge surfaces in air were also characterized using electron-hole recombination lifetimes.
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Photo-produced phonons in semiconductors
… be ascertained by observation of the electron-hole recombination luminescence.
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Theory of Tunneling-Injection Quantum Dot Lasers
… exploits tunneling-injection of electrons and holes into quantum dots (QDs) from two separate quantum wells (QWs). The potential of such a tunneling-injection QD laser for temperature-stable and high-power operation is studied under the realistic conditions of out-tunneling leakage of carriers …
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Near Field Scanning Optical Microscopy (NSOM) of nano devices
… due to diffusion and/or drift via electron-hole recombination process. For the first time in this research, the author addressed numerous challenges such as the intricate NSOM technique to resolve sub-wavelength dimension measurements of the elements and determine optimized experimental …
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Optical Characterization of Electrochemically Self-Assembled Compound Semiconductor Nanowires
… The 50 nm ZnO nanowires show an exciton recombination peak and an additional peak related to the deep trap levels. 25 nm ZnO nanowires show a only the exciton recombination peak, which is red shifted, possibly due to quantum confined Stark effect associated with built in charges in the …
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Formation Mechanisms and Photocatalytic Properties of ZnO-Based Nanomaterials
… gap modulation and the reduction of electron-hole recombination. Several approaches were studied, which included the incorporation of Au nanoparticles, N-doping of ZnO, supporting ZnO nanostructures on reduced graphene oxide (RGO), and supporting N-doped ZnO on N-doped RGO. ZnO-based …
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STM Study of Interfaces and Defects in 2D Materials
… charge carrier relaxation, and electron-hole recombination rates by defect engineering or varying growth condition in few-layer 1T-PtSe2 and other related 2D materials.
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Preparation, Characterization, and Evaluation of Photocatalytic Properties of a Novel NaNbO3/Bi2WO6 Heterostructure Photocatalyst for Water Treatment
… absorption efficiencies and severe electron-hole recombination, modifications on semiconductor structures are required in order to enhance their photocatalytic performance. Heterogeneous photocatalyst composites, taking advantage of the improved light absorption efficiency as well as the …
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Characterisation and simulation of InAs/InAsSb structures for mid-infrared LEDs
… radiative and non – radiative free carrier recombination processes. At higher temperatures, MQW photoluminescence was dominated by emission from electron – hole recombination in the InAs barrier layers. This was not observed for the SLS, with holes strongly confined in the QWs up to room …
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Complete electrical study of recombination properties of titanium and zinc deep levels in silicon
"Energy exchange mechanisms of electron and hole recombination at deep level traps in semiconductors are studied. New variations of the capacitance and current transient techniques are developed which overcome two major experimental limitations: (1) capture is too fast, and (2) optical excitation …
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Harvesting photon energy : ultra-thin crystalline silicon solar cell & near-field thermoradiative cells
… to couple out emitted photons from electron-hole recombination, is proposed to enhance energy conversion efficiency as well as the power density. We predict that the InSb thermoradiative cell can achieve the efficiency and power density up to 20.4 % and 327 Wm-2, respectively, between a hot …
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Efficiency droop mitigation and quantum efficiency enhancement for nitride Light-Emitting Diodes
… matrix elements in m-plane LEDs and smaller hole effective mass favors the hole transport across the active region so that m-plane LEDs exhibit 30% higher quantum efficiency and negligible efficiency droop at high injection levels compared to c-plane counterparts; (2) engineering of InGaN …
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Metal oxide nanostructures and hybrid perovskite semiconductor for photovoltaic application
… we reported the charge transport mechanism and recombination phenomena in dopantfree HTM perovskite solar cell using I-V and EIS measurement with the focus on physical processes within the perovskite material as an active layer and the parameters that determine the photovoltaic performance. …
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Photoanode and counter electrode modification for more efficient dye sensitized solar cells
… studied in order to minimize electron-hole recombination and electron backflow during photovoltaic processes of DSSCs. TiCl[subscript]4 solution treatment method was found to create a porous TiO[subscript]2 barrier layer. Ti sputtering method created a very compact TiO[subscript]2 …
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Nanostructured Thin Film Synthesis by Aerosol Chemical Vapor Deposition for Energy Storage Applications
… visible-light range along with reduced electron-hole recombination in the composite structures has been demonstrated.</p><p>The ACVD process is further extended to a novel single-step synthesis of nanostructured TiO2 electrodes directly on the current collector for applications as anodes in …
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Growth and characterization of site-controlled InAs(Sb) nanowires for use in infrared photodetectors
… due to strong non-radiative Auger and surface recombination. Simple structures suffer from deleterious effects due to the high surface to volume ratio in nanowires which has limited emission to fixed wavelengths and low temperatures, until now. In this thesis the growth of InAs(Sb) has been …
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Understanding transport processes of organic semiconductors via magnetic resonance methods
… widely acknowledged contribution from electron-hole recombination. Chapter 5 presents the experimental results on the electrical detection of spin current generated from spin pumping of molecular-based ferrimagentic V[TCNE]x based on the inverse spin Hall effect (ISHE), free from the influence …
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