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Unravelling the Mechanism of Ionic Fullerene Passivation for Efficient and Stable Methylammonium-Free Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-05-21 , DOI: 10.1021/acsenergylett.0c00871 Sibo Li 1 , Ke Fan 2 , Yuying Cui 1 , Shifeng Leng 1 , Yiran Ying 2 , Wenjun Zou 1 , Zhiliang Liu 1 , Chang-Zhi Li 3 , Kai Yao 1 , Haitao Huang 2
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-05-21 , DOI: 10.1021/acsenergylett.0c00871 Sibo Li 1 , Ke Fan 2 , Yuying Cui 1 , Shifeng Leng 1 , Yiran Ying 2 , Wenjun Zou 1 , Zhiliang Liu 1 , Chang-Zhi Li 3 , Kai Yao 1 , Haitao Huang 2
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Despite having attractive stability over the volatile methylammonium (MA) cation, double-cation (Cs, FA) perovskite solar cells are largely overlooked because of their inferior performance compared to MA-based devices. Among all the device engineering strategies, surface passivation represents a promising approach to acquire improved performance. However, effective passivation strategies have not yet been developed for attaining efficiencies of MA-free cells close to their theoretical limit. Herein, fullerene passivators with different binding groups are investigated to establish relationships between molecule structure and perovskite surface properties. It is found that surface treatment with bis-fulleropyrrolidium iodide (bFPI) can have strong interaction with charged defects, leading to effective defect passivation and favorable band-bending at the interface. The resulting bFPI-treated device shows significantly reduced defect density as well as accelerated electron extraction from perovskite into the cathode. Consequently, the MA-free device exhibits an efficiency of 21.1% with long-term environmental stability.
中文翻译：
揭示离子富勒烯钝化的高效稳定无甲铵钙钛矿太阳能电池的机理。
尽管对挥发性甲基铵（MA）阳离子具有吸引人的稳定性，但双阳离子（Cs，FA）钙钛矿型太阳能电池由于与基于MA的器件相比性能较差而被大大忽略。在所有的设备工程策略中，表面钝化是获得改善性能的一种有前途的方法。但是，尚未开发出有效的钝化策略来实现无MA细胞的效率接近其理论极限。在本文中，研究具有不同结合基团的富勒烯钝化剂以建立分子结构与钙钛矿表面性质之间的关系。发现使用双全氟吡咯烷碘化物（bFPI）进行表面处理可以与带电缺陷产生强烈的相互作用，导致有效的缺陷钝化和良好的界面弯曲。所得的经bFPI处理的器件显示出明显降低的缺陷密度，并加速了从钙钛矿到阴极的电子提取。因此，不含MA的设备显示了21.1％的效率，并具有长期的环境稳定性。
更新日期：2020-05-21
中文翻译：
揭示离子富勒烯钝化的高效稳定无甲铵钙钛矿太阳能电池的机理。
尽管对挥发性甲基铵（MA）阳离子具有吸引人的稳定性，但双阳离子（Cs，FA）钙钛矿型太阳能电池由于与基于MA的器件相比性能较差而被大大忽略。在所有的设备工程策略中，表面钝化是获得改善性能的一种有前途的方法。但是，尚未开发出有效的钝化策略来实现无MA细胞的效率接近其理论极限。在本文中，研究具有不同结合基团的富勒烯钝化剂以建立分子结构与钙钛矿表面性质之间的关系。发现使用双全氟吡咯烷碘化物（bFPI）进行表面处理可以与带电缺陷产生强烈的相互作用，导致有效的缺陷钝化和良好的界面弯曲。所得的经bFPI处理的器件显示出明显降低的缺陷密度，并加速了从钙钛矿到阴极的电子提取。因此，不含MA的设备显示了21.1％的效率，并具有长期的环境稳定性。
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