Structural and electronic properties of amorphous-silicon-based alloy materials. Final report, June 1983-May 1984
The research described in this report covers the structure and electronic properties of hydrogenated amorphous silicon and its alloys, emphasizing localized states in the gap and interface states. ESR and photoconductivity studies of prolonged illumination have led to a new model for the Staebler-Wronski effect, in which extra dangling bonds are created as a consequence of recombination. There is new evidence that the effect does not require the presence of impurities. DLTS and optical studies of gap states confirm that the dangling bond states are near mid-gap. Detailed information is presented concerning their role as recombination centers, through luminescence, ESR, and photoconductivity experiments. New localized states associated with phosphorus impurities have been observed by ESR, although their structural identity is not yet known. Time-of-flight measurements of compensated a-Si:H show that although the dangling bond density is low, compensation introduces other states near the band edges that could be boron-phosphorus complexes. Inverse photoemission has measured the conduction band density of states, identifying Si-H antibonding states and the approximate location of the mobility edge. NMR experiments find that thin films of a-Si:H have an excess hydrogen concentration and a new relaxation mechanism observed above 200/sup 0/K with an unknown origin. A wide variety of a-Si:H interfaces have also been studied.
- Research Organization:
- Xerox Palo Alto Research Center, CA (USA)
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 6258860
- Report Number(s):
- SERI/STR-211-2557; ON: DE85002909
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
SILICON ALLOYS
ELECTRICAL PROPERTIES
MICROSTRUCTURE
AMORPHOUS STATE
CARRIER MOBILITY
ELECTRIC CONTACTS
ENERGY GAP
INTERFACES
PHOTOCONDUCTIVITY
SILICON SOLAR CELLS
ALLOYS
CRYSTAL STRUCTURE
DIRECT ENERGY CONVERTERS
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
EQUIPMENT
MOBILITY
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
SOLAR CELLS
SOLAR EQUIPMENT
140501* - Solar Energy Conversion- Photovoltaic Conversion
360603 - Materials- Properties