Spidermen Strategy for Stable 24% Efficiency Perovskite Solar Cells |
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| Authors: | Xuping Liu Qinghua Li Juanjuan Zheng Jiewen Xu Zixia Chen Zimin Li Jie Liu Shengyong Liang Deng Wang Zhenghe Zhang Xiao Jin Jihuai Wu Xingcai Zhang |
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| Affiliation: | 1. Guangdong Provincial Key Laboratory of Development and Education for Special Needs Children, Lingnan Normal University, Zhanjiang, 524048 China;2. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138 USA;3. Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Institute of Materials Physical Chemistry, Huaqiao University, Xiamen, 361021 China |
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| Abstract: | The interface energetics-modification plays an important role in improving the power conversion efficiency (PCE) among the perovskite solar cells (PSCs). Considering the low carrier mobility caused by defects in PSCs, a double-layer modification engineering strategy is adopted to introduce the “spiderman” NOBF4 (nitrosonium tetrafluoroborate) between tin dioxide (SnO2 and perovskite layers. NO+, as the interfacial bonding layer, can passivate the oxygen vacancy in SnO2, while BF4− can optimize the defects in the bulk of perovskite. This conclusion is confirmed by theoretical calculation and transmission electron microscopy (TEM). The synergistic effect of NO+ and BF4− distinctly heightens the carrier extraction efficiency, and the PCE of PSCs is 24.04% with a fill factor (FF) of 82.98% and long-term stability. This study underlines the effectiveness of multifunctional additives in improving interface contact and enhancing PCE of PSCs. |
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| Keywords: | carrier extraction defects efficiency nitonium tetrafluoroborate perovskite solar cells |
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