Sputtered oxide/indium phosphide junctions and indium phosphide surfaces
The reason that sputtered indium-tin oxide (ITO)/InP solar cells junctions with large lattice mismatch have the same efficiency as CdS/InP junctions with good lattice match is shown to be that sputtered ITO/InP junctions actually consist of n/sup +/-ITO/n-InP/p-InP buried homojunctions. To demonstrate this and to show that the homojunction formation is caused by thermal damage to the InP surface during sputtering deposition rather than from impurity diffusion from the oxide, a series of five different metal oxide/InP junctions have been formed by sputtering of the oxide, all with high solar efficiency. Junctions have been prepared both from single-crystal InP : Cd and from epitaxial crystal films of InP : Zn. The effects of sputter deposition of the oxide have been simulated by sputter etching of the InP surface, and the effects analyzed through measurements of the properties of Au/InP junctions, and of the Hall effect and photoluminescence of InP surfaces. Some heat treatment of the sputtered cells is required to achieve maximum efficiency, but excessive heat treatment causes degradation and often transformation from homojunctionlike to heterojunctionlike solar cell behavior. An actual In/sub 2/O/sub 3//InP heterojunction solar cell has been prepared by thermal oxidation of the InP.
- Research Organization:
- Department of Materials Science and Engineering Stanford University, Stanford, California 94305
- DOE Contract Number:
- E(29-2)-3727
- OSTI ID:
- 5420375
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 51:5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sputtered indium-tin oxide/cadmium telluride junctions and cadmium telluride surfaces
Solar-cell characteristics and interfacial chemistry of indium-tin-oxide/indium phosphide and indium-tin-oxide/gallium arsenide junctions
Related Subjects
INDIUM OXIDES
SPUTTERING
INDIUM PHOSPHIDE SOLAR CELLS
FABRICATION
TIN OXIDES
CADMIUM SULFIDES
CRYSTAL LATTICES
DEPOSITION
DIFFUSION
EFFICIENCY
EPITAXY
ETCHING
FILMS
HALL EFFECT
HEAT TREATMENTS
IMPURITIES
INDIUM PHOSPHIDES
JUNCTIONS
MONOCRYSTALS
OXIDES
PYROLYSIS
SURFACES
CADMIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
CRYSTALS
DECOMPOSITION
DIRECT ENERGY CONVERTERS
EQUIPMENT
INDIUM COMPOUNDS
INORGANIC PHOSPHORS
OXYGEN COMPOUNDS
PHOSPHIDES
PHOSPHORS
PHOSPHORUS COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PNICTIDES
SOLAR CELLS
SOLAR EQUIPMENT
SULFIDES
SULFUR COMPOUNDS
SURFACE FINISHING
THERMOCHEMICAL PROCESSES
TIN COMPOUNDS
320302* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Materials