Over 12% efficiency Cu2ZnSn(SeS)4 solar cell via hybrid buffer layer

Efficiency of 12.3% on solution-based Cu
2
ZnSn(SeS)
4
(CZTSeS) solar cells was achieved by applying hybrid buffer layer with combination of In-based buffer and Cd-based buffer layers. Previously, the V
oc
boost by the hybrid buffer layer on Cu
2
ZnSnS
4
(CZTS) and CZTSeS solar cells have been reported[1–2]. In this paper, the latest results and some analyses of the hybrid buffer for solution-based CZTSeS cells will be presented.