Performance Enhancement of Kesterite Cu2ZnSn(S,Se)4 Thin Film Solar Cell

Work presented in this paper is based on findings of SCAPS simulation of Kesterite CZTSSe thin film solar cell. The main objective of this work is to investigate and improve overall performance of nanostructured Cu
2
ZnSn(S
1-x
,Se
x
)
4
/CdS/ZnO solar cell through optimization of thickness, band gap and doping concentration in absorption layer. These are major parameters which determine performance of the cell on large extent. The highest efficiency (simulation) reported for CZTSSe/CdS/ZnO before is 13%. Materials with large absorption coefficient in visible spectrum of solar irradiance, regular crystal structure and optimum band gap are being searched by researchers and industrialists for solar applications. There are less number of material compositions used for solar cell thin film application with concerns of cell-efficiency, device flexibility, manufacturing cost and availability of source materials in nature. Because extracting elements from its ores and then making a compound for the required applications raised manufacturing cost significantly. Adequacy of Kesterites in nature, less toxic, easy extraction of CZTS as compared to chalcogenide CIGS make it competent for the application. Removal of toxic elements introduced additional challenges which can be future objective of this work. The proposed optimizations have increased the cell-efficiency by 22.76% w.r.t. the reference work.