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Research on stable, high-efficiency amorphous silicon multijunction modules. Annual subcontract report, 1 January 1991--31 December 1991

Technical Report ·
DOI:https://doi.org/10.2172/10140346· OSTI ID:10140346
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This report describes the progress made during Phase 1 of research and development program to obtain high-efficiency amorphous silicon alloy multijunction modules. Using a large-area deposition system, double-and triple-junction cells were made on stainless steel substrates of over 1 ft{sup 2} area with Ag and ZnO predeposited back reflector. Modules of over 1 ft{sup 2} were produced with between 9.2% and 9.9 initial aperture-area efficiencies as measured under a USSC Spire solar simulator. Efficiencies as measured under the NREL Spire solar simulator were found to be typically 15% to 18% lower. The causes for this discrepancy are now being investigated. The modules show about 15% degradation after 600 hours of one-sun illumination at 50{degrees}C. To optimize devices for higher stabilized efficiency, a new method was developed by which the performance of single-junction cells after long-term, one-sun exposure at 50{degrees}C can be predicted by exposing cells to short-term intense light at different temperatures. This method is being used to optimize the component cells of the multijunction structure to obtain the highest light-degraded efficiency.
Research Organization:
National Renewable Energy Lab., Golden, CO (United States); United Solar Systems Corp., Troy, MI (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
AC02-83CH10093
OSTI ID:
10140346
Report Number(s):
NREL/TP--411-4840; ON: DE92001244
Country of Publication:
United States
Language:
English

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Related Subjects

14 SOLAR ENERGY
140501
36 MATERIALS SCIENCE
360101
360601
AMORPHOUS STATE
DEPOSITION
GERMANIUM BASE ALLOYS
LAYERS
PERFORMANCE TESTING
PHOTOVOLTAIC CONVERSION
PREPARATION AND FABRICATION
PREPARATION AND MANUFACTURE
PROGRESS REPORT
QUANTUM EFFICIENCY
SEMICONDUCTOR MATERIALS
SILICON ALLOYS
SILICON SOLAR CELLS
SILVER
STAINLESS STEELS
SUBSTRATES
ZINC OXIDES