Degradation of a CuxS/CdS solar cell in hot, moist air and recovery in hydrogen and air
| Autor: | P. S. McLeod, D. E. Sawyer, J. A. Duisman, T. M. Peterson, C. S. Dean, L. D. Partain |
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| Rok vydání: | 1983 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 54:6708-6720 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.331858 |
| Popis: | A polycrystalline, thin‐film CuxS/CdS solar cell was exposed to air saturated with water vapor at temperatures between 27 and 67 °C for up to 6 1/2 h. The short‐circuit current decreased progressively from 11.7 to 1.02 mA/cm2. Subsequent heating in hydrogen at 150 °C for 680 h and in 170 °C air for 5 h restored the short‐circuit current to 14.4 mA/cm2. Modeling of the measured quantum yield indicates that the degradation could be quantitatively explained by two effects: (1) the CuxS minority carrier electron diffusion length decreasing from 0.23 to 0.02 μm (±20%) and (2) the CuxS optical band gap increasing from 1.16 to 1.46 eV (±3%). The recovery was quantitatively modeled by the CuxS diffusion length increasing back to 0.24 μm and the CuxS band gap returning to 1.16 eV. A Burstein–Moss analysis shows the band‐gap shift is due to the Fermi level penetration of the valence band as the measured hole concentration increased from 1.03(1020) cm−3 to 4.62(1021) cm−3 during degradation. A new band structure is ... |
| Databáze: | OpenAIRE |
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