Stable, High-Efficiency Amorphous-Silicon Solar Cells with Low Hydrogen Content: Final Subcontract Report, 1 March 1991 - 31 March 1993
This report describes a 21-month project to demonstrate amorphous-silicon (a-Si) solar cells with high stabilized conversion efficiency. The objective was to develop a research program spanning material issues (more stable a-Si and better a-SiGe alloys) and device issues (more stable a-Si-based solar cells) with the goal of high stabilized solar cell efficiency. The Institute of Energy Conversion (IEC) produced and analyzed the stability of a-Si films and solar cells with reduced hydrogen content (2--6%). A thermodynamic model of defect formation was developed that describes the high-temperature degraded state of a solar cell. An analysis of bifacial current voltage and quant-efficiency insults for a-SiGe p-i-n devices with transparent front and back contacts provided information about the influence of alloying and band-gap grading on hole and electron collection. IEC also studied the stability of graded and ungraded a-SiGe solar cells using bifacial devices to learn about the relative degradation of hole and electron collection, and concludes that degradation of the photoconductivity of a-SiGe materials does not agree with degradation observed in solar cells.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- DOE Contract Number:
- AC36-08GO28308;
- OSTI ID:
- 10184141
- Report Number(s):
- NREL/TP-451-5756; ON: DE93018214
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140501
360601
amorphous silicon
AMORPHOUS STATE
CRYSTAL GROWTH
EFFICIENCY
germanium
GERMANIUM ALLOYS
high efficiency
HYDROGEN
INTERMETALLIC COMPOUNDS
MATERIALS
PHOTOCONDUCTIVITY
PHOTOVOLTAIC CONVERSION
photovoltaics
PREPARATION AND MANUFACTURE
PROGRESS REPORT
SILICON
SILICON ALLOYS
SILICON SOLAR CELLS
solar cells
140501
360601
amorphous silicon
AMORPHOUS STATE
CRYSTAL GROWTH
EFFICIENCY
germanium
GERMANIUM ALLOYS
high efficiency
HYDROGEN
INTERMETALLIC COMPOUNDS
MATERIALS
PHOTOCONDUCTIVITY
PHOTOVOLTAIC CONVERSION
photovoltaics
PREPARATION AND MANUFACTURE
PROGRESS REPORT
SILICON
SILICON ALLOYS
SILICON SOLAR CELLS
solar cells