Quality assessment of CuInS2 based solar cells by Raman scattering

In this work the spectroscopic linewidth of the Raman A1 mode of CuInS2 thin films is investigated. A broadening for the A1 mode with an asymmetric slope towards larger wavenumbers is observed. The comparison with parameters of the solar cells formed out of these thin films reveal a direct correlation between the linewidth of the A1 mode and the solar cell data. A decrease of open circuit voltage and fill factor of the cells is found for linewidths larger than 3.6 cm 1. For linewidths smaller than 3.6 cm 1, a saturated behavior of the solar cell parameters is observed. This saturation indicates other origins of performance limitation to be present in CuInS2 based device