Enhancement of device performance with optimized absorber layer in CIGS solar cell

Numerical simulation of CIGS solar cell has been carried out in this study to investigate the performance of the solar cell with different band-gap and thickness of the absorber layer. In this paper, we also introduce the effect of Ga content on solar cell material parameters. The aim of this work is to check the device performance like open circuit voltage, short circuit current density, fill-factor and efficiency with the change of thickness and band-gap of the absorber layer. It is shown that, by optimizing the CIGS absorber layer it is possible to achieve an AM 1.5G conversion efficiency of greater than 22% which is an increased value than presently reported.