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Beschreibung:
We investigate the instability phenomena in pin solar cells with a mu c-Si:H i-layer deposited under conditions close to the transition to amorphous growth, resulting in compact material, and other cells containing a high crystalline volume fraction of material with a pronounced porosity. The cells were first annealed in vacuum at 160 degrees C and then treated in de-ionized water at 80 degrees C for different lengths of time, stored under ambient conditions and annealed again. We observed a strong degradation of the current-voltage (J-V) parameters after treatment in de-ionized water, for the cells with highly crystalline and porous i-layers, while cells with compact i-layer material show very little changes in their J-V parameters.