Improvement of efficiency in CZTSSe solar cell by using back surface field

Abstract

A kesterite CZTS based solar cell is studied with back surface field. In order to achieve this, a p+ layer of SnS is added to the standard cell configuration. The resulting p+-p-n configuration of SnS/CZTS/CdS is studied using Solar Cell Capacitance Simulator (SCAPS). Low Voc is responsible for lower efficiencies of kesterite solar cells. The proposed p+-p-n structure increases the Voc and thus the efficiency. Simulation of CZTSSe and CZTS with back surface p+ layer has shown considerably higher efficiency than the highest reported value for kesterite cell of CZTSSe from 12.3% to 15.7%. A comparative summary is presented with literature reported performance and our simulated performance for kesterite cell.