Abstract
Transients in the current-voltage characteristics of (Cd,Zn)S/CuInSe2 solar cells after sudden changes in illumination are reported. The transients are found to vary with bias across the cell, intensity, temperature, illumination wavelength, and recent illumination history. Multiple trapping levels, primarily in the CuInSe2 near the interface, are seen as responsible for the observed dc voltage shift and are photoexcited in less than 1 ms. Relaxation in the dark takes tens of seconds and appears dominated by states in the (Cd,Zn)S which gives wavelength dependent effects on fill factor and transient decay.
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