Numerical simulation of CZTS thin film solar cell

The performance of CZTS (Cu₂ZnSnS₄) thin film solar cell is numerically simulated in this paper. The influences of structural and physical parameters are studied, including thickness, carrier density and defect density of CZTS absorber, thickness of CdS buffer layer. It can be found in the simulation results that to reach high conversion efficiency, the cell should have a thin buffer layer and a thick absorber layer. It is necessary to control the defect density in the absorber one order lower than carrier density. The effect of operating temperature on the cell performance shows that increased temperature will strongly affect the efficiency. The presence of low band gap interfacial layer between CZTS absorber and Mo back contact may lower the open circuit voltage.