The halide-mixed CH₃NH₃PbX_3-yI_y (X = Cl, Br) (MAPbX_3-yI_y) films have tunable band gaps for applications in perovskite solar cells (PSCs). The performances of PSCs can be further adjusted by halide mixing of perovskite films. Preparing the MAPbX_3-yI_y films by low pressure vapor-assisted solution process (LP-VASP) could achieve pin-hole free perovskite films, which has the potential to mass production of perovskite films. In this study, the MAPbX_3-yI_y (X = Cl, Br) thin films are prepared by exposing PbI₂ films in various amine salts vapor and applied to fabricate the planar PSCs. Systematical structural-property investigations on the MAPbI_3-yX_y (X = Cl, Br) thin films demonstrate that the halide-mixed perovskite films could be achieved by adopting different amine salts. The MAPbI₃/MAPbCl₃ biphasic constitution is observed in perovskite films using pure MACl, while the MAPbI_3-yCl_y (y ≈ 0) could be obtained using MACl:MAI mixture. Using pure MABr or MABr:MAI mixture, the MAPbBr_3-yI_y films are prepared. The XRD and XPS results indicate that there is no remnant Cl in the MAPbI_3-yCl_y (y ≈ 0) films, nor I in the MAPbBr_3-yI_y (y ≈ 0) films. Because the amine salts are excess, the halogen in amine salts mainly decide the halogen in CH₃NH₃PbX₃ in our study. Moreover, the MAPbCl_3-yI_y (y ≈ 0) and MAPbBr_3-yI_y based PSCs are demonstrated to behave better stability than the MAPbI₃ based PSC under continuous illumination at AM 1.5G. Furthermore, the planar PSCs based on 15 wt% MACl mixed MAI exhibit power conversion efficiency of 17.3% with good stability over 3600 h.

卤化物混合的CH ₃ NH ₃ PbX _3-y I _y（X = Cl，Br）（MAPbX _3-y I _y）膜具有可调节的带隙，适用于钙钛矿太阳能电池（PSC）。PSC的性能可以通过钙钛矿薄膜的卤化物混合来进一步调节。通过低压蒸气辅助溶液法（LP-VASP）制备MAPbX _3-y I _y膜可实现无针孔钙钛矿膜，这具有大量生产钙钛矿膜的潜力。在这项研究中，通过暴露PbI ₂制备MAPbX _3-y I _y（X = Cl，Br）薄膜各种胺盐中的薄膜蒸发，并用于制造平面PSC。在MAPbI _3-y X _y（X = Cl，Br）薄膜上的系统结构性质研究表明，通过采用不同的胺盐可以实现卤化物混合的钙钛矿薄膜。使用纯MACl在钙钛矿薄膜中观察到MAPbI ₃ / MAPbCl ₃双相结构，而使用MACl：MAI混合物可获得MAPbI _3-y Cl _y（y≈0）。使用纯MABr或MABr：MAI混合物，制备MAPbBr _3-y I _y膜。XRD和XPS结果表明MAPbI _3-y Cl _y中没有残留Cl（y≈0）电影，也不是MAPbBr _3-y中的I _y（y≈0 ）电影。由于胺盐过量，因此在我们的研究中，胺盐中的卤素主要决定了CH ₃ NH ₃ PbX ₃中的卤素。此外，基于MAPbCl _3-y I _y（y≈0）和基于MAPbBr _3-y I _y的PSC在AM 1.5G连续照明下比基于MAPbI ₃的PSC具有更好的稳定性。此外，基于15 wt％MACl混合MAI的平面PSC的功率转换效率为17.3％，在3600 h内具有良好的稳定性。