Task B: Research on stable, high-efficiency, large-area, amorphous-silicon-based submodules: Semiannual subcontract report, 1 February 1987--31 July 1987
This semiannual report presents results of research on stable, high-efficiency, large-area, amorphous-silicon-based submodules. High conversion efficiencies (up to 11.95%) were obtained in small-area, single-junction, a-Si solar cells by using textured tin oxide, superlattice p-layers, graded carbon concentrations near the p-i interface, and highly relective ITO/silver back contacts. Researchers also fabricated single-junction a-SiC and a-SiGe p-i-n cells with efficiencies of 9%--11%. Stacked-junction cells of a-SiC/a-Si, a-SiC/a-SiGe, and a-SiC/a-Si/a-SiGe were fabricated, and efficiencies of about 10% were achieved in some of them. Boron-doped microcrystalline SiC films were developed that contain up to 6 at.% C with conductivities of 3 /times/ 10/sup /minus/3/ ohm /sup /minus/1/ cm/sup /minus/1/ at room temperature and activation energies of 0.11 eV. Stability studies showed that light-induced degradation is usually enhanced by the presence of C grading near the p-i interface. Light-induced degradation of the fill factor of p-i-n cells strongly correlates with optical absorption at 1.2 eV, as measured by photothermal deflection spectroscopy. 11 refs., 70 figs., 16 tabs.
- Research Organization:
- Solar Energy Research Inst., Golden, CO (USA); Solarex Corp., Newtown, PA (USA). Thin Film Div.
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 6628879
- Report Number(s):
- SERI/STR-211-3375; ON: DE89000843
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SILICON SOLAR CELLS
PERFORMANCE TESTING
AMORPHOUS STATE
EFFICIENCY
EXPERIMENTAL DATA
FABRICATION
PHOTOVOLTAIC CELLS
PROGRESS REPORT
TIN OXIDES
CHALCOGENIDES
DATA
DIRECT ENERGY CONVERTERS
DOCUMENT TYPES
EQUIPMENT
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRIC CELLS
SOLAR CELLS
SOLAR EQUIPMENT
TESTING
TIN COMPOUNDS
140501* - Solar Energy Conversion- Photovoltaic Conversion