一种用于稳定 α-FAPbI3 和控制高性能湿空气处理钙钛矿太阳能电池晶体取向的通用分子间交换策略,Advanced Materials

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一种用于稳定 α-FAPbI3 和控制高性能湿空气处理钙钛矿太阳能电池晶体取向的通用分子间交换策略
Advanced Materials ( IF 27.4 ) Pub Date : 2022-03-25 , DOI: 10.1002/adma.202200041
Min Wang ₁ , Haoxuan Sun ₁ , Linxing Meng ₁ , Meng Wang ₁ , Liang Li ₁

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在没有严格环境控制的情况下制备高性能钙钛矿太阳能电池是商业化的必然趋势。湿度被认为是阻碍钙钛矿性能的主要因素。基于甲脒 (FA) 的钙钛矿具有光活性黑色 α-FAPbI _{3 的不稳定性，}尤其是在潮湿空气中，并且钙钛矿薄膜的表面和体积中的许多缺陷限制了它们的性能。在这项工作中，通过反溶剂工程将长链正庚胺 (nHA) 引入基于 FA 的钙钛矿薄膜中。nHA去除负中间加合物并促进α-FAPbI _3的形成在室温下在潮湿空气中通过分子间交换行为。此外，最终钙钛矿薄膜中 nHA 的存在也减少了缺陷并抑制了离子迁移。冠军器件的功率转换效率 (PCE) 为 23.7%（认证为 22.76%），滞后可忽略不计，制造的器件表现出卓越的再现性。器件的稳定性也得到了增强，在环境空气中 1500 小时后保持其初始 PCE 的 95%。此外，在连续 1 日光照射 500 小时下，PCE 在最大功率点没有衰减。其他钙钛矿成分也证明了该方法的普遍性，包括甲胺铅碘 (MAPbI ₃ ) 和 FA _x MA ₁₋_x PbI ₃在潮湿的空气中。

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A Universal Strategy of Intermolecular Exchange to Stabilize α-FAPbI3 and Manage Crystal Orientation for High-Performance Humid-Air-Processed Perovskite Solar Cells

Preparation of high-performance perovskite solar cells without strict environmental control is an inevitable trend of commercialization. Humidity is considered the main factor hindering perovskite performance. Formamidine (FA)-based perovskites suffer from the instability of photoactive black α-FAPbI_3, especially in humid air, and numerous defects in the surface and bulk of perovskite films limit their performance. In this work, long-chain n-heptylamine (nHA) is introduced via antisolvent engineering into an FA-based perovskite film. nHA removes the negative intermediate adduct and promotes the formation of α-FAPbI₃ at room temperature in humid air via intermolecular exchange behavior. Moreover, the existence of nHA in the final perovskite film also reduces the defects and suppresses ion migration. The champion device delivers a power conversion efficiency (PCE) of 23.7% (certificated 22.76%) with negligible hysteresis, and the fabricated devices exhibit superior reproductivity. The device stability is also enhanced, maintaining 95% of its initial PCE after 1500 h in ambient air. Moreover, the PCE has no attenuation at the maximum power point under continuous 1-sun light soaking for 500 h. The universality of this method is also demonstrated by other perovskite compositions, including methylamine lead iodine (MAPbI₃) and FA_xMA₁₋_xPbI₃ in humid air.

更新日期：2022-03-25

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