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Results of controlled light-soaking (CLS) on commercially available amorphous silicon (a-Si) photovoltaic (PV) modules are presented. Climatically controlled irradiation (800 Wm{-2} of 8 a-Si modules was performed at 3 module temperatures (ranging from 25 C to 65 C) in order to study the effects of light induced degradation of a-Si modules. It was established that a knowledge of the temperature coefficients of current and voltage were required in order to correctly interpret the observed degradation. This requires that the temperature coefficients are measured before controlled light-soaking begins. An exponential degradation of the module power with the root of exposure time was observed.

Annealing of the light saturated modules confirmed the partial reversibility of the Staebler-Wronski effect on a-Si PV modules and indicates appropriate annealing temperatures for these a-Si modules to be 85 C. The module temperature should be controlled during CLS/annealing in order to set a common reference level of degradation appropriate for the subsequent testing. .

Additional information

Authors: DUNLOP E D, DJL Software Consultancy Ltd, Jarrow (GB);OSSENBRINK H A, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 13th European Photovoltaic Solar Energy Conference, Nice (FR), October 23-27, 1995
Availability: Available from (1) as Paper EN 39419 ORA
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