Recent developments in ZnO/CdS/CuGaSe{sub 2} single crystal solar cells
Book
·
OSTI ID:208046
- Univ. Konstanz (Germany). Fakultaet fuer Physik
An improvement of the power conversion efficiency of ZnO/CdS/CuGaSe{sub 2} single crystal solar cells was achieved by repetitive low temperature annealing. This resulted in a new improved efficiency of 6.7% (under 83 mW/cm{sup 2} AM1.5 illumination), given by an open circuit voltage of 837 mV, a short circuit current density of 13.4 mA/cm{sup 2} and a fill factor of 50%. Diode characteristics with and without illumination were analyzed. A reduced doping concentration within the CuGaSe{sub 2} absorber close to the CdS interface as well as an improved dark saturation current are made responsible for the efficiency enhancement. Photoluminescence spectra showed recombination on both sides of this interface. The results indicate that tunneling assisted by the defect levels in the CdS layer and a high series resistance still restrict the optimum device performance.
- OSTI ID:
- 208046
- Report Number(s):
- CONF-941203--; ISBN 0-7803-1459-X
- Country of Publication:
- United States
- Language:
- English
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