Improving Efficiency of Evaporated Cu₂ZnSnS₄ Thin Film Solar Cells by a Thin Ag Intermediate Layer between Absorber and Back Contact

Figure 5

Time-resolved photoluminescence traces of absorbers fabricated with or without an Ag intermediate layer. The minority carrier lifetime can be obtained from curve fitting the data using equation (4). The blue and pink curves correspond to fitted ones for (Cu,Ag)₂ZnSnS₄ and CZTS, respectively.