Cadmium sulfide/copper ternary heterojunction cell research: Final subcontract report, 1 October 1984-31 May 1987
This is the final technical progress report on a thirty-two month research program on CuInSe/sub 2/ and CuInGaSe/sub 2/ based thin-film polycrystalline heterojunction solar cells. CuInGaSe/sub 2/ films incorporating Ga fractions (x in CuIn/sub 1-x/Ga/sub x/Se/sub 2/) from 0.04 to 1.0 have been prepared and characterized. CuInGaSe/sub 2//CdZnS heterojunction devices have been fabricated for a range of Ga contents and show the expected variations in Voc and spectral response with Ga content. An efficiency of 10.2% (SERI test, ASTM87) has been measured for a cell with Ga fraction of 0.23, the highest efficiency reported for this material. A CuInSe/sub 2//CdZnS monolithically interconnected four cell series string of 91 cm/sup 2/ area has been fabricated with a total area efficiency of 9.5% (SERI test, ASTM87). Results are presented on Ion-Assisted Deposition of the selenide and sulfide, on a new design for the Se evaporation source, on ITO reactive sputter deposition, and on CdZnS films prepared from an E-Gun Evaporation source. Spectral response and I-V characteristic variations with selenide composition before and after heat-treatment are discussed for the CuInSe/sub 2//CdZnS devices. The highest AM1 total area efficiency for the CuInSe/sub 2//CdZnS cell is now 11.9% (Boeing test, AM1 spectrum) with five cells measured over the previously reported high of 10.9%. Room Temperature Photoluminescence, Voltage Contrast Imaging of junction cross sections, Raman spectroscopy, and EXAFS measurements on the CuInSe/sub 2//CdZnS devices are also presented and discussed. 45 refs., 41 figs.
- Research Organization:
- Boeing Co., Seattle, WA (USA). High Technology Center
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 5626015
- Report Number(s):
- SERI/STR-211-3230; ON: DE88001122
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
ALLOY SYSTEMS
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COPPER
DATA
DEPOSITION
DIRECT ENERGY CONVERTERS
DOCUMENT TYPES
ELEMENTS
EQUIPMENT
EXPERIMENTAL DATA
FILMS
GALLIUM
HETEROJUNCTIONS
INFORMATION
INORGANIC PHOSPHORS
JUNCTIONS
METALS
NUMERICAL DATA
PHOSPHORS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PROGRESS REPORT
QUATERNARY ALLOY SYSTEMS
RESEARCH PROGRAMS
SEMICONDUCTOR JUNCTIONS
SOLAR CELLS
SOLAR EQUIPMENT
SULFIDES
SULFUR COMPOUNDS
SURFACE COATING
TERNARY ALLOY SYSTEMS
TESTING
THIN FILMS
TRANSITION ELEMENTS