Study of ZnTe:Cu back contacts on CdTe/CdS thin film solar cells
- Colorado School of Mines, Golden, CO (United States). Dept. of Physics
Vacuum-evaporated Cu-doped ZnTe films have been studied as the intermediate layer between CdTe and metal contacts in CdTe/CdS thin-film solar cells for the formation of low resistance back contacts. Different metals (Au, Ni, Co) have been investigated as the contact material to the ZnTe layer. The effects of Cu concentration, ZnTe:Cu layer thickness, and ZnTe post-deposition annealing temperature on the cell performances have been investigated. The authors found that different metal contacts on the ZnTe layer lead to different doping densities in the CdTe layer and different open-circuit photovoltages of the solar cells. The possible formation of a back contact diode at the CdTe/ZnTe interface was explored, based on capacitance-voltage analysis. The series resistance of the CdTe/CdS cells was reduced significantly by the introduction of the ZnTe layer. Fill factors greater than 0.76 and an energy conversion efficiency of 12.9% have been achieved using ZnTe back contacts on electrodeposited CdTe.
- Sponsoring Organization:
- National Renewable Energy Lab., Golden, CO (United States)
- OSTI ID:
- 417697
- Report Number(s):
- CONF-960401--; ISBN 1-55899-329-0
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ANNEALING
CADMIUM SULFIDE SOLAR CELLS
CAPACITANCE
CHEMICAL COMPOSITION
COBALT
COPPER
CURRENT DENSITY
EFFICIENCY
ELECTRIC CONTACTS
ELECTRIC POTENTIAL
ELECTRON MICROPROBE ANALYSIS
EXPERIMENTAL DATA
FILL FACTORS
GOLD
ILLUMINANCE
NICKEL
PERFORMANCE
VACUUM EVAPORATION
ZINC TELLURIDES