The defect density of the absorber layer plays a vital role in the output parameters of the cell. Defect density defines carrier collection and overall performance by controlling diffusion length, carrier lifetime, recombination, and so on. Here all output parameters are declining for defect density enhancement. The reason for the performance decline is shown in the graph as well. Here, carrier diffusion length and carrier lifetime is decreasing significantly. Due to a significant drop in carrier diffusion length and carrier lifetime, the total carrier in the cell drops, and hence the overall performance decline accordingly.