For the calculation of device performance, we need to know
the values of the parameters. In this work, we used three layers
for the simulation. These are: 1) p-type CIGS absorber layer, 2)
n-type CdS buffer layer and 3) ZnO window layer. Here, the
surface recombination velocities were set at 07 cmls for both
electrons and holes. The AM 1.5G solar spectrum is used and
the temperature is set at 300k for this numerical simulation.