A novel cadmium free buffer layer for Cu(In,Ga)Se{sub 2} based solar cells
- Univ. Stuttgart (Germany). Inst. fuer Physikalische Elektronik
Solar cells based on Cu(In,Ga)Se{sub 2} were prepared replacing the standard buffer layer CdS with a In{sub x} (OH,S){sub y} thin film. The film is deposited in a chemical bath (CBD) process using an aqueous solution containing InCl{sub 3} and thioacetamide. X-ray photoemission spectroscopy measurements were performed in order to characterize the growth kinetics and the chemical composition. The influence of different concentrations of InCl{sub 3} and thioacetamide in the solution on the electrical properties of the solar cells was studied by measuring the j-V characteristics and the spectral quantum efficiencies. Capacitance-voltage (C-V) measurements indicate that the high V{sub OC} values of devices with the novel buffer layer are correlated with narrower space charge widths and higher effective carrier concentrations in the absorber materials. The achieved conversion efficiency of approximately 15% using the cadmium free In{sub x} (OH,S){sub y} buffer demonstrates the potential of this process as an alternative to the standard chemical bath deposition of CdS.
- OSTI ID:
- 208017
- Report Number(s):
- CONF-941203--; ISBN 0-7803-1459-X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CADMIUM SULFIDES
CHEMICAL COATING
COPPER SELENIDE SOLAR CELLS
EXPERIMENTAL DATA
FABRICATION
INDIUM CHLORIDES
INDIUM HYDROXIDES
INDIUM SELENIDE SOLAR CELLS
INDIUM SULFIDES
MATERIAL SUBSTITUTION
PHOTOELECTRON SPECTROSCOPY
QUANTUM EFFICIENCY
SOLAR ABSORBERS
X-RAY SPECTROSCOPY