Antimony halide perovskites (AHPs) are promising materials for the development of environmentally friendly semi‐transparent perovskite solar cells (ST‐PSCs). However, the poor device performance due to sub‐optimal film quality and structure‐induced defects in lead‐free AHPs remains a challenge for their potential commercialization. Here, we have addressed this issue by incorporating Cs 3 Sb 2 Br 9 quantum dots (QDs) in lead‐free Cs 3 Sb 2 I 9 ‐based ST‐PSCs and demonstrated that Cs 3 Sb 2 Br 9 QDs passivation in these ST‐PSCs can lead to a three‐fold enhancement in power conversion efficiency (PCE) and −3% increase in average visible transmittance. The higher performance is attributed to the better film formation by controlling crystallization and reducing nonradiative recombination by suppressing the defect states. Our study provides an effective defect passivation approach to develop stable and environmentally friendly ST‐PSCs.
Sharma et al. (Wed,) studied this question.