Interface strains and lattice distortion are inevitable issues during perovskite crystallization. Silane as a coupling agent is a popular connector to enhance the compatibility between inorganic and organic materials in semiconductor devices. Herein, a protonated amine silane coupling agent (PASCA‐Br) interlayer between TiO₂ and perovskite layers is adopted to directionally grasp both of them by forming the structural component of a lattice unit. The pillowy alkyl ammonium bromide terminals at the upper side of the interlayer provide well‐matched growth sites for the perovskite, leading to mitigated interface strain and ensuing lattice distortion; meanwhile, its superior chemical compatibility presents an ideal effect on healing the under‐coordinated Pb atoms and halogen vacancies of bare perovskite crystals. The PASCA‐Br interlayer also serves as a mechanical buffer layer, inducing less cracked perovskite film when bending. The developed molecular‐level flexible interlayer provides a promising interfacial engineering for perovskite solar cells and their flexible application.

中文翻译：

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通过分子水平的柔性中间层减少界面张力的钙钛矿薄膜用于光伏应用。

在钙钛矿结晶过程中，界面应变和晶格畸变是不可避免的问题。硅烷作为偶联剂是一种流行的连接器，可增强半导体器件中无机材料和有机材料之间的相容性。此处，TiO ₂之间的质子化胺硅烷偶联剂（PASCA-Br）中间层钙钛矿层通过形成晶格单元的结构成分而定向地抓住它们两者。中间层上方的枕形烷基溴化铵末端为钙钛矿提供了良好匹配的生长位点，从而减轻了界面应变并导致晶格畸变。同时，其优异的化学相容性对修复钙钛矿裸晶中未配位的Pb原子和卤素空位具有理想的效果。PASCA-Br中间层还可以用作机械缓冲层，从而在弯曲时减少钙钛矿膜的破裂。先进的分子级柔性中间层为钙钛矿型太阳能电池及其柔性应用提供了有前途的界面工程。