Fig. 4
From: Unveiling the role of dual grading in device optimization of HTL-free Sb2(S, Se)3 solar cells
(a) Change of PCE of HTL-free Sb2(S, Se)3 cells with absorber doping concentration, and (b) Comparison between recombination rates at zero bias across the absorber cell with NA = 3.6 × 1016 cm−3 and optimized doping cell with NA = 3 × 1015 cm−3.
