Growth and characterization of GaAs, AlGaAs and their heterostructures by organometallic vapor phase epitaxy
Organometallic Vapor Phase Epitaxy (OMVPE) is a cold wall vapor desposition technique using organometallic and/or hydride sources for the fabrication of a variety of epitaxial compound semiconductor alloys on suitable substrates. The use of the OMVPE process to produce high quality GaAs, AlGaAs, and their heterostructures on GaAs substrates using trimethygalium (TMG), trimethylalumium (TMA), and arsine is described. For GaAs epitaxial films, the unintentional residual donor sand acceptors have been identified using far-infrared photo-ionization data, and low temperature photoluminescence, respectively, and their concentrations have been evaluated using Hall data. For the growth of AlGaAs films, it was observed that poor quality films were obtained due to oxygen contamination of the layer during growth. A series of graded bandgap heterostructures and abrupt quantum well heterostructures were grown over a variety of growth conditions. Composition gradings were controlled over a full range of alloy compositions on distances as small as 500 - 1000 A, and a 40 A quantum well heterostructure was obtained at low growth temperatures (550/sup 0/C). Finally, results are presented on a few devices which incorporate metallurgical junctions and heterojunctions with the GaAs/AlGaAs system. These devices include a microwave vertical FET structure, graded bandgap solar cells, and light emitting diodes.
- OSTI ID:
- 6629586
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
GALLIUM ARSENIDES
FABRICATION
SEMICONDUCTOR MATERIALS
SOLAR CELLS
EPITAXY
ORGANOMETALLIC COMPOUNDS
THIN FILMS
ARSENIC COMPOUNDS
ARSENIDES
DIRECT ENERGY CONVERTERS
EQUIPMENT
FILMS
GALLIUM COMPOUNDS
MATERIALS
ORGANIC COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PNICTIDES
SOLAR EQUIPMENT
140501* - Solar Energy Conversion- Photovoltaic Conversion
360601 - Other Materials- Preparation & Manufacture