自聚合螺环型界面分子实现高效稳定的钙钛矿太阳能电池

Self-Polymerized Spiro-Type Interfacial Molecule toward Efficient and Stable Perovskite Solar Cells, Angew. Chem. Int. Ed. 2024, e202318754

      在追求高效钙钛矿太阳能电池的过程中，spiro-OMeTAD已经证明了创纪录的功率转换效率，然而，稳定性问题仍然是制约其商业发展的瓶颈之一。鉴于此，2024年2月26日南京工业大学王芳芳&秦天石&复旦大学杨迎国于Angew刊发自聚合螺环型界面分子实现高效稳定的钙钛矿太阳能电池的研究成果，成功合成了一种新型自聚合螺型界面分子，称为v-spiro。与spiro-OMeTAD相比，线性排列的分子表现出更强的分子间相互作用和更高的固有空穴迁移率。重要的是，v-spiro中的乙烯基能够进行原位聚合，在钙钛矿薄膜表面形成聚合物保护层，这被证明在抑制水分降解和离子迁移方面非常有效。利用这些优势，由于缺陷密度降低、能级对准和高效界面空穴提取，基于Poly-V-Spiro的器件实现了24.54%的出色效率，开路电压提高到1.173 V，填充因子达到81.11%。此外，未封装器件的运行稳定性显著增强，即使在约60%湿度下运行2000 小时或在连续AM 1.5G阳光照射下运行1250 小时后，初始效率仍保持在90%以上。这项工作提出了一种通过创新的界面设计实现钙钛矿太阳能电池的高效率和长期稳定性的综合方法。

     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.

原文：

https://onlinelibrary.wiley.com/doi/10.1002/anie.202318754