A Self‐Assembling Composite Structural Design for the Conversion of Hydroxyl‐Anchored Bonds Obtains High Efficient and Stable Perovskite Solar Cells

• DOI: 10.1002/adma.202420155
• Publication Date: 2025-05-27T12:49:03Z
• Authors: Haiyang Zhang; Yan Yang; Jianming Zhao; Hanjun Yang; Ying Lu; Yihuan Xie; Shuo Yao; Zhaoyang Chu; Changjian Huang; Zengqi Huang; Mingbin Zhou; Qixin Wan; Qi Li; Tianxiang Zhao; Qianying Lin; Xia Yang; Rui Guo; Zhihua Xiong; Xiaotian Hu

Abstract Self‐assembled monolayers (SAMs) serve as the hole‐transporting layer (HTL) in perovskite solar cells, yet their instability on indium tin oxide (ITO) substrates poses a challenge practical. The typical SAMs are susceptible to solvents during deposition process which can result being washed or dislodged, thereby impeding formation of dense SAM. Here, novel guanidine‐modified polyurethane siloxane elastomers is synthesized enhance anchoring capability ITO, exhibits strong interactions with [2‐(3,6‐dimethoxy‐9H‐carbazol‐9‐yl)ethyl] phosphonic acid (MeO‐2PACz) SAMs, co‐construct self‐assembled composite structure (SACS). By utilizing this anchor strategy, weakly bonded MeO‐2PACz adhering ITO be converted into strongly form, curtailing migration surface spin‐coating process, well inhibiting shedding that may occur due solvent washing device preparation process. SACS heighten charge collection ability and suppress interfacial recombination, growth upper layer. Finally, SACS‐based power conversion efficiency 26.37%. unencapsulated based stored for at least 5000 h little degradation performance.