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 256 for “"heterojunction"”.
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A quantum dot heterojunction photodetector
This thesis presents a new device architecture for photodetectors utilizing colloidally grown quantum dots as the principle photo-active component. We implement a thin film of cadmium selenide (CdSe) quantum dot sensitizers, sandwiched between an electron-transporting titanium dioxide (TiO2) layer …
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Alloyed heterojunction nanorods and their applications
… half of my dissertation focuses on CdSe/CdTe heterojunction nanorods for use in photovoltaics. First, I utilized a simple post-synthesis ligand exchange procedure to greatly improve their environmental stability. Then, we integrated them into sensitized solar cells. By alloying CdTe with Se …
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Investigation of silicon-cadmium sulphide heterojunction photodetectors
Abstract available p. 4
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Compound Semiconductor Power Heterojunction Bipolar Transistor Technology
This work will conclude by discussing the lingering issues with the GaN project and the methods in which to solve these issues. It will also discuss the implications of the power amplifier analysis.
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Modeling and Characterization of Heterojunction Bipolar Transistors
Heterojunction bipolar transistor (HBTs) offer several advantages over their homo-junction counterparts resulting from the use of semiconductors in the emitter and base with different bandgaps. These advantages include high current gain, large cut-off frequency and short gate delay in digital logic …
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GaN heterojunction FET device Fabrication, Characterization and Modeling
… and modeling technologies for GaN-based Heterojunction Field Effect Transistors (HFETs). The interest in investigating GaN HFETs is motivated by the advantageous material properties of nitride semiconductor such as large band gap, large breakdown voltage, and high saturation velocity, …
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Heterojunction A1GaAs-GaAs solar cells for space applications
… structures which are heteroface and triple heterojunction are investigated in this study. A complete theoretical study including optimisation for the optical properties ( transmission and reflection) of the heteroface Alo.sGao.2As- GaAs space solar cell is presented. The grid shadow and …
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InGaAs/GaAsSb type-Il heterojunction vertical tunnel-FETs
The supply voltage (VDD) scaling of conventional CMOS technology is approaching its limit due to the physical limit of 60 mV/dec subthreshold swing (SS) at room temperature and the requirement for controlled leakage current. In order to continue VDD scaling for low power applications, novel device …
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Near-Infrared Indium-Gallium Phosphide-Arsenide Double Heterojunction Lasers
Made available in DSpace on 2014-12-12T20:54:46Z (GMT). No. of bitstreams: 1 7804200.pdf: 3291865 bytes, checksum: ce6e38a15de39527abc38a543f50830f (MD5) Previous issue date: 1977
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Organic lateral heterojunction devices for vapor-phase chemical detection
As the U.S. is engaged in battle overseas, there is an urgent need for the development of sensors for early warning and protection of military forces against potential attacks. On the battlefields, improvised explosive devices (IEDs) have resulted in 54% of all coalition deaths in Iraq and 59% in …
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The AlInP material system in heterojunction bipolar transistor technology
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Composition, structure, and performance of nanocrystal bulk heterojunction photovoltaics
We describe the fabrication and study of bulk heterojunction solar cells composed of PbS quantum dots and TiO2. In particular, we study the effects that bulk heterojunction composition and structure have on resulting device performance. We find that PbS and titania are extremely evenly distributed …
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Cu₂S/ZnCdS thin film heterojunction solar cell studies
Cu₂S/CdS solar cells have been studied extensively for the past two decades due to their potentially high efficiencies per unit cost. The operation and characteristics of Cu₂S/CdS solar cells are fairly well understood. However, the properties of the newer Cu₂S/ZnCdS cell type are not well …
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Formulation of a full dynamic transport model for heterojunction devices
… an {dollar}Al\sb{0.3}Ga\sb{0.7}As/GaAs{dollar} heterojunction increases from 1.33V to 1.54V which is consistent with the results reported by others (1) {dollar}-{dollar} (4). Maximum velocity of electrons changes from 2.5 {dollar}\times{dollar} 10{dollar}\sp7{dollar}cm/sec to 1.8 …
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Characteristics of a New Copolymer For Bulk Heterojunction Solar Cells
<p>Organic solar cells have attractive aspects like flexibility, light-weight, environment-friendliness and low-cost due to manufacturing-ease on large area substrates using roll-to-roll processing, solution casting or screen printing. Most high performance organic solar cells utilize tandem …
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High-Performance Indium Gallium Phosphide/gallium Arsenide Heterojunction Bipolar Transistors
To enable the widespread use of InGaP/GaAs HBTs, much research on the fabrication, performance, and characterization of these devices is required. This dissertation will discuss the design and implementation of high-performance InGaP/GaAs HBTs as well as study HBT device physics and …
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Indium-Gallium Phosphide-Arsenide - Gallium Arsenide-Phosphide Single Heterojunction Lasers
Made available in DSpace on 2014-12-12T20:54:13Z (GMT). No. of bitstreams: 1 7606730.pdf: 2847725 bytes, checksum: 538397f02a07c1415ab059d85212392e (MD5) Previous issue date: 1975
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Indium-Gallium Phosphide-Arsenide Double Heterojunction Lasers and Defect Tunneling
Made available in DSpace on 2014-12-12T20:54:38Z (GMT). No. of bitstreams: 1 7726705.pdf: 3460480 bytes, checksum: 32ba591f66c7d9269700fee65ffaf1ef (MD5) Previous issue date: 1977
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An investigation of heterojunction bipolar transistors by molecular beam epitaxy
… the growth, characterization, and modeling of heterojunction bipolar transistors (HBTs). The superior high current handling capacity and high operation frequency of heterojunction bipolar transistors have attracted a great deal of interest in millimeter-wave and high-speed digital applications. …
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Electrical and optical characterisation of bulk heterojunction polymer-fullerene solar cells
Manufacturing polymer-fullerene solar cells can be less expensive and less complicated as compared to inorganic solar cells. We studied transport properties of the polymer- poly3(hexyl-thiophene) (P3HT), fullerene - [6,6]-phenyl-C61 butyric acid methyl ester (PCBM), and P3HT:PCBM blends of selected …
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