Structure and electrical properties of CdS and CdTe thick films for solar cell applications
Low cost solar cells based on CdTe/CdS heterojunction devices are discussed and their production studied using a single crystal CdS substrate mounted close to a CdTe source in a closed temperature controlled block. The CdTe had been doped with Au or P and was p-type and its film growth rate was 100 ..mu..m/H at a source temperature of 680/sup 0/C in H/sub 2/ with the substrate support at 480/sup 0/C oriented CdTe grains formed of 15 to 25 ..mu..m diam. with their 111 axis parallel to the c-axis of the CdS, CdTe-films grown on fused sapphire and silica had random grain orientation with grain size of 5 ..mu..m. The epitaxial films on CdS had a resistivity of 15 to 440 ..cap omega.. cm, whereas those on glasslike bases had a value of 10/sup 5/ ..cap omega.. cm. Films were also grown from an In-doped CdS source in H/sub 2/ at atmospheric pressure using silica substrates. They had grain sizes of 1 to 3 ..mu..m with resistivities of 10/sup 3/ ..cap omega.. cm. It is concluded that lateral electrical resistivity is determined mainly by grain size and epitaxy and large grain size is needed in solar cells.
- OSTI ID:
- 7235700
- Journal Information:
- J. Vac. Sci. Technol.; (United States), Vol. 12:4; Conference: 2. conference on structure/property relationships in thick films and bulk coatings, San Francisco, CA (USA), 10 Feb 1975
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM SULFIDE SOLAR CELLS
ELECTRICAL PROPERTIES
PHYSICAL PROPERTIES
CADMIUM SULFIDES
CRYSTAL DOPING
CADMIUM TELLURIDES
CADMIUM COMPOUNDS
CHALCOGENIDES
DIRECT ENERGY CONVERTERS
INORGANIC PHOSPHORS
PHOSPHORS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SOLAR CELLS
SULFIDES
SULFUR COMPOUNDS
TELLURIDES
TELLURIUM COMPOUNDS
140501* - Solar Energy Conversion- Photovoltaic Conversion