At the device operating conditions, defects such as interstitials, vacancies, and impurities at the grain boundary and surface of photoactive layer have great impact on the power conversion efficiency (PCE) and device stability. To better passivate the surface and boundary defects, and further enhance the PCE and device stability, herein, a bipolar organic material termed 1,4‐bis(perfluorophenyl)‐2,5‐di(pyridin‐4‐yl)‐1,4‐dihydropyrrolo [3,2‐b] pyrrole (PFPPY) is introduced as modifier in antisolvent. The effects of PFPPY on perovskite film quality, photovoltaic performance, and charge transfer properties are systematically investigated. Under the optimized conditions, the PFPPY‐treated device shows an impressive PCE of 19.62%, which is 12% higher than the reference device (17.59%), and greatly enhanced stability, maintaining 95% of its initial efficiency under room temperature (RT) and relative humidity (RH) 30% condition for 650 h without encapsulation.

中文翻译：

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双极性有机材料辅助的基于MAPbI3的高效钙钛矿转化钙钛矿太阳能电池的表面和边界缺陷钝化

在器件工作条件下，光敏层晶界和表面的间隙，空位和杂质等缺陷会对功率转换效率（PCE）和器件稳定性产生重大影响。为了更好地钝化表面和边界缺陷，并进一步增强PCE和器件稳定性，此处使用一种称为1,4-双（全氟苯基）-2,5-双（吡啶-4-基）-1,4的双极性有机材料。 ‐dihydropyrrolo [3,2‐ b在反溶剂中引入吡咯（PFPPY）作为改性剂。系统地研究了PFPPY对钙钛矿膜质量，光伏性能和电荷转移性能的影响。在优化条件下，经过PFPPY处理的器件的PCE达到了令人印象深刻的19.62％，比参考器件（17.59％）高出12％，并且稳定性大大提高，在室温（RT）下保持其初始效率的95％相对湿度（RH）30％条件下持续650小时。