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Enhanced Efficiency and Stability of Inverted CsPbI2Br Perovskite Solar Cells via Fluorinated Organic Ammonium Salt Surface Passivation
Langmuir ( IF 3.7 ) Pub Date : 2024-02-06 , DOI: 10.1021/acs.langmuir.3c03437 Shihan Cao 1 , Lang Wang 1 , Xingchen She 1 , Wei Li 1 , Lin Wei 1 , Xia Xiong 1 , Zhijun Wang 2 , Jie Li 1 , Haibo Tian 1 , Xumei Cui 1 , Min Zhang 1 , Hui Sun 1 , Dingyu Yang 1 , Xin Liu 1
Langmuir ( IF 3.7 ) Pub Date : 2024-02-06 , DOI: 10.1021/acs.langmuir.3c03437 Shihan Cao 1 , Lang Wang 1 , Xingchen She 1 , Wei Li 1 , Lin Wei 1 , Xia Xiong 1 , Zhijun Wang 2 , Jie Li 1 , Haibo Tian 1 , Xumei Cui 1 , Min Zhang 1 , Hui Sun 1 , Dingyu Yang 1 , Xin Liu 1
Affiliation
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All-inorganic perovskite solar cells (PSCs) have recently received increasing attention due to their outstanding thermal stability. However, the performance of these devices, especially for the devices with a p–i–n structure, is still inferior to that of the typical organic–inorganic counterparts. In this study, we introduce phenylammonium iodides with different side groups on the surface of the CsPbI2Br perovskite film and investigate their passivation effects. Our studies indicate that the 4-trifluoromethyl phenylammonium iodide (CFPA) molecule with the –CF3 side group effectively decreases the trap density of the perovskite film by forming interactions with the undercoordinated Pb2+ ions and significantly inhibits the nonradiative recombination in the derived PSC, leading to an enhanced open-circuit voltage (Voc) from 0.96 to 1.10 V after passivation. Also, the CFPA post-treatment enables better energy-level alignment between the conduction band minimum of CsPbI2Br perovskite and [6,6]-phenyl C61 butyric acid methyl ester, thereby enhancing the charge extraction from the perovskite to the charge transport layer. These combined benefits result in a significant enhancement of the power conversion efficiency from 11.22 to 14.37% for inverted CsPbI2Br PSCs. The device without encapsulation exhibits a degradation of only ≈4% after 1992 h in a N2 glovebox.
中文翻译：
通过氟化有机铵盐表面钝化提高倒置 CsPbI2Br 钙钛矿太阳能电池的效率和稳定性
全无机钙钛矿太阳能电池（PSC）由于其出色的热稳定性而近年来受到越来越多的关注。然而，这些器件的性能，特别是具有 ap-i-n 结构的器件，仍然不如典型的有机-无机器件。在本研究中，我们在CsPbI 2 Br钙钛矿薄膜表面引入了具有不同侧基的苯基碘化铵，并研究了它们的钝化效果。我们的研究表明，带有–CF 3侧基的4-三氟甲基苯基碘化铵（CFPA）分子通过与欠配位的Pb 2+离子形成相互作用，有效降低钙钛矿薄膜的陷阱密度，并显着抑制衍生PSC中的非辐射复合。 ，导致钝化后开路电压 ( V oc ) 从 0.96 V 提高到 1.10 V。此外，CFPA后处理可以使CsPbI 2 Br钙钛矿的导带最小值和[6,6]-苯基C61丁酸甲酯之间更好的能级对齐，从而增强从钙钛矿到电荷传输层的电荷提取。这些综合优势使得倒置 CsPbI 2 Br PSC 的功率转换效率从 11.22% 显着提高到 14.37%。没有封装的器件在 N 2手套箱中放置 1992 小时后仅表现出约 4% 的降解。
更新日期：2024-02-06
中文翻译：
通过氟化有机铵盐表面钝化提高倒置 CsPbI2Br 钙钛矿太阳能电池的效率和稳定性
全无机钙钛矿太阳能电池（PSC）由于其出色的热稳定性而近年来受到越来越多的关注。然而，这些器件的性能，特别是具有 ap-i-n 结构的器件，仍然不如典型的有机-无机器件。在本研究中，我们在CsPbI 2 Br钙钛矿薄膜表面引入了具有不同侧基的苯基碘化铵，并研究了它们的钝化效果。我们的研究表明，带有–CF 3侧基的4-三氟甲基苯基碘化铵（CFPA）分子通过与欠配位的Pb 2+离子形成相互作用，有效降低钙钛矿薄膜的陷阱密度，并显着抑制衍生PSC中的非辐射复合。 ，导致钝化后开路电压 ( V oc ) 从 0.96 V 提高到 1.10 V。此外，CFPA后处理可以使CsPbI 2 Br钙钛矿的导带最小值和[6,6]-苯基C61丁酸甲酯之间更好的能级对齐，从而增强从钙钛矿到电荷传输层的电荷提取。这些综合优势使得倒置 CsPbI 2 Br PSC 的功率转换效率从 11.22% 显着提高到 14.37%。没有封装的器件在 N 2手套箱中放置 1992 小时后仅表现出约 4% 的降解。
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