钙钛矿(结构)
分子
聚合
材料科学
化学工程
化学
纳米技术
结晶学
聚合物
有机化学
复合材料
工程类
作者
Qiushuang Tian,Jingxi Chang,Junbo Wang,Qingyun He,Shaoyu Chen,Pinghui Yang,Hongze Wang,Jingya Lai,Mengyang Wu,Xiangru Zhao,Chongyu Zhong,Renzhi Li,Wei Huang,Fangfang Wang,Yingguo Yang,Tianshi Qin
标识
DOI:10.1002/ange.202318754
摘要
In the pursuit of highly efficient perovskite solar cells, spiro‐OMeTAD has demonstrated recorded power conversion efficiencies (PCEs), however, the stability issue remains one of the bottlenecks constraining its commercial development. In this study, we successfully synthesize a novel self‐polymerized spiro‐type interfacial molecule, termed v‐spiro. The linearly arranged molecule exhibits stronger intermolecular interactions and higher intrinsic hole mobility compared to spiro‐OMeTAD. Importantly, the vinyl groups in v‐spiro enable in‐situ polymerization, forming a polymeric protective layer on the perovskite film surface, which proves highly effective in suppressing moisture degradation and ion migration. Utilizing these advantages, poly‐v‐spiro‐based device achieves an outstanding efficiency of 24.54%, with an enhanced open‐circuit voltage of 1.173 V and a fill factor of 81.11%, owing to the reduced defect density, energy level alignment and efficient interfacial hole extraction. Furthermore, the operational stability of unencapsulated devices is significantly enhanced, maintaining initial efficiencies above 90% even after 2000 hours under approximately 60% humidity or 1250 hours under continuous AM 1.5G sunlight exposure. This work presents a comprehensive approach to achieving both high efficiency and long‐term stability in PSCs through innovative interfacial design.
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