Gallium arsenide thin films on tungsten/graphite substrates. Phase II. Quarterly project report No. 1, September 1-November 30, 1977
Efforts have been directed to the deposition and characterization of gallium arsenide films on graphite and tungsten/graphite substrates and the fabrication and evaluation of solar cells on these substrates. Sulfur doped gallium arsenide films have been deposited on graphite substrates at 725 to 825/sup 0/C, and their structural and electrical properties investigated. The gallium arsenide/graphite interface has been found to be rectifying in all cases studied. However, at high doping levels, the voltage drop across the gallium arsenide/graphite interface is sufficiently low for solar cell purposes. Solar cells of the configuration Ag/n-GaAs/n/sup +/-GaAs/graphite have AMl efficiencies (without AR coating) of about 2.7%. The deposition of gallium arsenide films on tungsten/graphite substrates has been continued with emphasis on the oxidation of gallium arsenide. Both argon-oxygen and oxygen-water vapor mixtures have been used as oxidizing agents. Using titanium dioxide as the anti-reflection coating, an Au/n-GaAs/n/sup +/-GaAs/W/graphite solar cell has an AMl efficiency of 5.6%; however, its characteristics degraded under continuous illumination due presumably to trapping effects. Several p-n junction gallium arsenide solar cells have been prepared on tungsten/graphite substrates. The highest open-circuit voltage obtained was about 250 mV; however, the short-circuit current was very low.
- Research Organization:
- Southern Methodist Univ., Dallas, TX (USA)
- DOE Contract Number:
- AC03-76SF01284
- OSTI ID:
- 6407989
- Report Number(s):
- DOE/SF/01284-T2; ON: DE81023560
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thin films of gallium arsenide on low-cost substrates. Quarterly project report No. 3, March 1, 1977-May 31, 1977
Gallium arsenide thin films on tungsten/graphite substrates: Phase II. Topical report: thin film gallium arsenide solar cells on tungsten/graphite substrates
Related Subjects
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
ANTIREFLECTION COATINGS
ARSENIC COMPOUNDS
ARSENIDES
CARBON
CHALCOGENIDES
COATINGS
CRYSTAL DOPING
CRYSTAL STRUCTURE
DEPOSITION
DIRECT ENERGY CONVERTERS
EFFICIENCY
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EPITAXY
EQUIPMENT
FABRICATION
GALLIUM ARSENIDE SOLAR CELLS
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
GRAPHITE
JUNCTIONS
METALS
MICROSTRUCTURE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
P-N JUNCTIONS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METALS
SEMICONDUCTOR JUNCTIONS
SOLAR CELLS
SOLAR EQUIPMENT
SUBSTRATES
SULFUR
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN