Zn/sub 3/P/sub 2/ as an improved semiconductor for photovoltaic solar cells. Eighth quarterly report, June 1-August 31, 1980
The diffusion coefficient of magnesium in Zn/sub 3/P/sub 2/ has been determined by two methods: (1) from the rate of decrease of the quantum efficiency at short wavelengths; and (2) from the location of the EBIC response maxima in cleaved junctions. The diffusion coefficient of magnesium ranges from 4.9 +- 1.6.10/sup -10/ cm/sup 2//min determined by EBIC measurements to 1.7.10/sup -10/ cm/sup 2//min from spectral response measurements. The values of n and k of thin (60 to 150 A) magnesium films has been measured over a range wavelengths. This will enable adequate modeling of single and multiple layer AR coatings in the future. The heating of magnesium contacts on Zn/sub 3/P/sub 2/ has the effect of reversing grain boundary recombination and leads to enhanced output at the boundary. EBIC measurements show a higher output at grain boundaries after heating at 100/sup 0/C for 94 minutes. The V/sub oc/ of ZnO/Zn/sub 3/P/sub 2/ devices exhibits a non linear dependence on ln J/sub sc/ at high current levels suggesting photo current suppression. Thin Zn/sub 3/P/sub 2/ flms were prepared on carbon coated 3% Si-Fe in an attempt to lower R/sub s/ x A and improve device efficiency. Although the new substrate results in lower R/sub s/ x A and high short circuit currents are obtained, the open circuit potential is reduced and the overall conversion efficiency is the same as devices prepared on Fe/C coated mica. (WHK)
- Research Organization:
- Delaware Univ., Newark (USA). Inst. of Energy Conversion
- DOE Contract Number:
- AC02-77CH00178
- OSTI ID:
- 6518068
- Report Number(s):
- SERI/PR-80062-1-T1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Zn/sub 3/P/sub 2/ as an improved semiconductor for photovoltaic solar cells. Eighth quarterly report, June 1, 1980-August 31, 1980
Zn/sub 3/P/sub 2/ as an improved semiconductor for photovoltaic solar cells. Seventh quarterly report, March 1, 1980-May 31, 1980
Related Subjects
ZINC PHOSPHIDE SOLAR CELLS
FABRICATION
PERFORMANCE
ANTIREFLECTION COATINGS
CAPACITANCE
DIFFUSION
EFFICIENCY
ELECTRIC CONTACTS
ELECTRICAL PROPERTIES
GRAIN BOUNDARIES
MAGNESIUM
P-N JUNCTIONS
POLYCRYSTALS
SPECTRAL RESPONSE
SUBSTRATES
ZINC PHOSPHIDES
ALKALINE EARTH METALS
COATINGS
CRYSTAL STRUCTURE
CRYSTALS
DIRECT ENERGY CONVERTERS
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
JUNCTIONS
METALS
MICROSTRUCTURE
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
PNICTIDES
SEMICONDUCTOR JUNCTIONS
SOLAR CELLS
SOLAR EQUIPMENT
ZINC COMPOUNDS
140501* - Solar Energy Conversion- Photovoltaic Conversion