Ultra-high photoelectric conversion efficiency and obvious carrier separation in photovoltaic ZnIn2X4 (X = S, Se, and Te) van der Waals heterostructures

The ZnIn 2 S 4 /ZnIn 2 Se 4 heterostructure has obvious carrier separation. The maximum theoretical photoelectric conversion efficiency of ZnIn 2 S 4 /ZnIn 2 Se 4 heterostructure was 32.1%, and it can be further enhanced to 32.9% under 2% tensile strain.