biostudies-literatureUnknown11(29)Fu SThe preparation of Cs _<i>y</i> FA_1-<i>y</i> PbI _<i>x</i> Br_3-<i>x</i> -based perovskite by ultrasonic spraying has valuable application in the preparation of tandem solar cells on textured substrates due to its excellent stability and the advantages of large-area uniform preparation from the spraying technology. However, the bandgap of perovskite prepared by spraying method is difficult to adjust, and perovskites with a wide bandgap have the issue of phase instability. Here, we improved the crystallinity of the perovskite by simply controlling the post-annealing temperature. The results show that perovskite film prepared by hybrid spray method has the best crystallinity and device performance at a post-annealing temperature of 170 °C. On this basRSC advances17595-17602https://www.ebi.ac.uk/biostudies/studies/S-EPMC9032767biostudies-literatureBandgap adjustment assisted preparation of >18% Cs _<i>y</i> FA_1-<i>y</i> PbI _<i>x</i> Br_3-<i>x</i> -based perovskite solar cells using a hybrid spraying process.PMC9032767Li WHuang FPeng YLong FFu SXiang TXiao JXiao YKu ZZhong JYu XCheng YfalseBandgap adjustment assisted preparation of >18% Cs _<i>y</i> FA_1-<i>y</i> PbI _<i>x</i> Br_3-<i>x</i> -based perovskite solar cells using a hybrid spraying process.The preparation of Cs _<i>y</i> FA_1-<i>y</i> PbI _<i>x</i> Br_3-<i>x</i> -based perovskite by ultrasonic spraying has valuable application in the preparation of tandem solar cells on textured substrates due to its excellent stability and the advantages of large-area uniform preparation from the spraying technology. However, the bandgap of perovskite prepared by spraying method is difficult to adjust, and perovskites with a wide bandgap have the issue of phase instability. Here, we improved the crystallinity of the perovskite by simply controlling the post-annealing temperature. The results show that perovskite film prepared by hybrid spray method has the best crystallinity and device performance at a post-annealing temperature of 170 °C. On this bas2021-01-01T00:00:00Z2021 May2025-05-18T11:49:19.878Z2024-10-18T05:46:35.498ZS-EPMC90327673548016210.1039/d1ra02666f