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Tri-functionalized TiOxCl4-2x accessory layer to boost efficiency of hole-free, all-inorganic perovskite solar cells

查看全文 作　　者：Qingwei [1]Zhou;Jialong [1]Duan;Yudi [1]Wang;Xiya [1]Yang;Qunwei [1]Tang 高影响力作者 机构地区：[1]Institute of New Energy Technology,College of Information Science and Technology,Jinan University,Guangzhou 510632,Guangdong,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2020年第29卷第11期,共8页高影响力期刊 基　　金：the National Natural Science Foundation of China(61774139,U1802257);Director Foundation from Qingdao National Laboratory for Marine Science and Technology(QNLM201702);Postdoctoral Research Foundation of China(2019M650231,2019M663379);the Natural Science Foundation of Guangdong Province(2019B151502061);the Fundamental Research Funds for the Central Universities(11618409,11619311)。 摘　　要：Tin dioxide(SnO2) is generally regarded as a promising electron-transporting layer(ETL) for state-of-theart perovskite solar cells(PSCs), however, the ubiquitous oxygen-vacancy-related defects at SnO2 surface and the large energy difference between conduction band of SnO2 and perovskite layer undoubtedly cause severe charge carrier recombination, resulting in sluggish charge extraction efficiency and non-negligible open-circuit voltage(Voc) loss. Herein, a chlorine-containing TiOxCl4-2x accessory layer is fabricated by immersing SnO2 layer into the TiCl4 aqueous solution to passivate the surface oxygen-vacancy-related defects of SnO2 layer and to set an intermediate energy level at ETL/perovskite interface in all-inorganic cesium lead tri-bromine(CsPbBr3) PSCs. Furthermore, the TiOxCl4-2x layer also improves the infiltration of SnO2 layer surface toward perovskite precursor for high-quality perovskite film. Finally, the hole-free, allinorganic CsPbBr3PSC with a structure of FTO/SnO2/TiOxCl4-2x/Cs0.91Rb0.09PbBr3/carbon achieves a champion efficiency of 10.44% with a Vocas high as 1.629 V in comparison to 8.31% for control device. Moreover, the optimized solar cell presents good stability in 80% humidity in air. 关 键 词：All-inorganic perovskite solar cells Electron-transporting layer Cesium lead bromine Charge recombination Stability
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