Comparison of chalcopyrite and kesterite thin-film solar cells

• DOI: 10.1016/j.jiec.2016.09.005
• Publication Date: 2016-09-14T15:45:43Z
• Authors: Kee-Jeong Yang; Jun-Hyoung Sim; Dae-Ho Son; Dong-Hwan Jeon; Dae-Kue Hwang; Dahyun Nam; Hyeonsik Cheong; SeongYeon Kim; JunHo Kim; Dae-Hwan Kim; Jin-Kyu Kang
• Keywords: Kesterite; Thin layers

Abstract In this study, we investigate methods of improving the efficiency of Cu 2 ZnSn(S,Se) 4 (CZTS)-based solar cells by comparing Cu(In,Ga)Se 2 (CIGSe)- and CZTS-based absorber layers. In particular, the CZTS-based absorber exhibits lower current characteristics than the CIGSe absorber layer in terms of the band gap alignment and electron-hole recombination at the CdS-absorber interface. Moreover, we demonstrate that defects are one of the causes of the voltage loss. In order to improve the efficiency of CZTS-based solar cells, it is important to control the band gap alignment at the CdS-absorber layer interface and to suppress the formation of secondary phases inside the absorber.