![]() This study helps to redefine the effect of a water molecule on FAPbI 3 solar cells. Therefore, a high-humidity post-treatment strategy is proposed to fabricate α-FAPbI 3 solar cells with a champion PCE of 20.19% (0.1 cm 2) and 18.91% (1 cm 2), which is currently the highest recorded value in vapor deposited pure α-FAPbI 3 perovskite solar cells. ![]() Moreover, theoretical calculations interestingly reveal a phase transition shortcut induced by the abnormal volume contraction that is ascribed to the formation of double hydrogen bonds at a certain H 2O concentration. It is found that under high humidity conditions, a fast phase transition between high-purity α- and δ-phase FAPbI 3 can be realized. In this study, the first vapor deposited pure α-FAPbI 3 thin film solar cell with a power conversion efficiency (PCE) over 20% is achieved by regulating the phase transition process. ![]() ![]() To fabricate stable neat FAPbI 3 perovskite with a pure α-phase (pure α-FAPbI 3) is important in the field of photovoltaic commercialization because of its better bandgap than its alloying counterpart with cesium (Cs) or methylammonium (MA) cations. ![]()
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