Design of CZTS-Perovskite thin-film Hetero-Junction Solar Cell

The Thin film technology is one of the fastest growing technologies because of the increase in energy demands and scarcity of energy materials. In thin film solar PVs PSC & CZTS are two of the most promising, abundant and efficient thin film solar PVs. They offer tunable band-gaps that can be adjusted for maximum PCE. Perovskite is one of the efficient solar PV material with a band-gap ranges between 1.55 to 2.3 eV which is too much close to the optimum photovoltaic conversion material. But it is less stable and vulnerable to environment while CZTS is more stable but have less band-gap as compared to perovskite. So, we make a tandem of perovskite & CZTS to utilize their efficiencies and durability. We simulate different thickness of layers and band-gaps of this tandem using SCAPS-1D, which is one of the best utilities for efficiency calculations of thin film solar PVs. We performed different simulations for that tandem while changing the allowable thickness of absorber layers & their band-gaps to obtain an optimum solution. During multiple simulations I obtained a better efficiency of 22.61% which was the greater efficiency during my simulations.I have used SCAPS-1D for modeling and simulations of thin film Perovskite and CZTS solar cells, calculated their I-V curve QE (quantum efficiency) for different thickness whose ranges are 200-500 nm for perovskite and 200nm to 1.2um for CZTS with step-length thickness of 25nm. I selected the best configuration for my simulations for better performance, on which I performed further simulations and chose model with efficiency of 22.61%. Which shows that a handsome amount of conversion efficiency is achievable for tandem solar cells consist of Perovskite and CZTS.