Research on amorphous silicon-germanium alloys for tandem solar cells
This report presents results of research on amorphous silicon- germanium alloys for tandem solar-cell applications. A study was completed of a-Si{sub 1 {minus} x}Ge{sub x}:H and a-Si{sub 1 {minus} x}Ge{sub x}:H:F alloys. This included extensive structural examination by transmission electron spectroscopy, gas evolution, and differential scanning calorimetry, and also a measurement of the dependence of the mobility-lifetime product for electrons in the two types al alloys. It also included a project to deposit for electron in the two types of alloys. It also included a project to deposit a- Si:H and its alloys by photochemical vapor deposition, which is described. Microstructure, on a scale of 100 angstroms, appears to be an important determinant of film properties. Structure can also be modified by altering the proportions of SiH{sub 4}, GeH{sub 4}, and H{sub 2} used in growing the films. Films grown by photo-CVD were compared with those grown by conventional glow discharge. 65 refs., 19 figs.
- Research Organization:
- Harvard Univ., Cambridge, MA (USA). Div. of Applied Sciences
- Sponsoring Organization:
- DOE/CE
- DOE Contract Number:
- AC02-83CH10093
- OSTI ID:
- 5691478
- Report Number(s):
- SERI/STR-211-3525; ON: DE89009436
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
14 SOLAR ENERGY
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
ALLOYS
AMORPHOUS STATE
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
CRYSTAL GROWTH
CRYSTAL STRUCTURE
DEPOSITION
DIRECT ENERGY CONVERTERS
DOCUMENT TYPES
ELECTRIC DISCHARGES
EQUIPMENT
FABRICATION
GERMANIUM ALLOYS
GLOW DISCHARGES
MICROSTRUCTURE
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PROGRESS REPORT
RESEARCH PROGRAMS
SILICON SOLAR CELLS
SOLAR CELLS
SOLAR EQUIPMENT
SURFACE COATING
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
ALLOYS
AMORPHOUS STATE
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
CRYSTAL GROWTH
CRYSTAL STRUCTURE
DEPOSITION
DIRECT ENERGY CONVERTERS
DOCUMENT TYPES
ELECTRIC DISCHARGES
EQUIPMENT
FABRICATION
GERMANIUM ALLOYS
GLOW DISCHARGES
MICROSTRUCTURE
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PROGRESS REPORT
RESEARCH PROGRAMS
SILICON SOLAR CELLS
SOLAR CELLS
SOLAR EQUIPMENT
SURFACE COATING