Crystallization mechanism and defect passivation of Cu₂ZnSn(S,Se)₄ thin film solar cells <i>via in situ</i> potassium doping

Abstract

Alkali metal doping has achieved prominent results in Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells. In this paper, in situ K-doped CZTSSe thin film solar cells were prepared by magnetron sputtering with a K-containing CZTS target.