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A surface modifier enhances the performance of the all-inorganic CsPbI2Br perovskite solar cells with efficiencies approaching 15.
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020-06-02 , DOI: 10.1039/d0cp01437k
Kaiyuan Wang 1 , Jiyu Zhou , Xing Li , Nafees Ahmad , Haoran Xia , Guangbao Wu , Xuning Zhang , Boxing Wang , Dongyang Zhang , Yu Zou , Huiqiong Zhou , Yuan Zhang
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020-06-02 , DOI: 10.1039/d0cp01437k
Kaiyuan Wang 1 , Jiyu Zhou , Xing Li , Nafees Ahmad , Haoran Xia , Guangbao Wu , Xuning Zhang , Boxing Wang , Dongyang Zhang , Yu Zou , Huiqiong Zhou , Yuan Zhang
Affiliation
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All-inorganic perovskite solar cells (PSCs) are attracting considerable attention due to their promising thermal stability, but their inferior power-conversion efficiencies (PCE) hinder their realistic application. Here, we propose an approach through surface modification based on methyl ammonium halide (MAX) for inorganic CsPbI2Br solar cells processed at a low temperature. The combined benefits of the introduced MAX modifier enable the boosting of the power conversion efficiency to 14.8% with an impressive FF of 82.2% in CsPbI2Br PSCs. Our experimental analyses coupled with optical modeling indicate that the incorporated MAX leads to an effective passivation of the surface traps originating from Pb2+ and I− ions in CsPbI2Br and simultaneously mediates the crystallization of CsPbI2Br with slightly enlarged grains and reduced numbers of structural defects and pinhole. As a result, the interfacial trap-assisted recombination is suppressed and the charge extraction is promoted. Mechanistically, we show that in the presence of MAX, the deep-level traps in the perovskites are passivated, leaving the energy of the trapping centers to become shallower. In this situation, the negative impacts of the traps on carrier transport and recombination are mitigated.
中文翻译：
表面改性剂可提高全无机CsPbI2Br钙钛矿太阳能电池的性能，效率接近15。
全无机钙钛矿太阳能电池（PSC）由于其有希望的热稳定性而备受关注，但其功率转换效率（PCE）较差，阻碍了其实际应用。在此，我们针对低温处理的无机CsPbI 2 Br太阳能电池提出了一种基于甲基卤化（MAX）的表面改性方法。引入的MAX改性剂的综合优点使功率转换效率提高到14.8％，CsPbI 2 Br PSC的FF达到了令人印象深刻的82.2％。我们加上光学建模实验分析表明，掺入MAX导致表面陷阱始发的有效钝化选自Pb 2+和我-离子CsPbI2 Br并同时介导CsPbI 2 Br的结晶，晶粒稍大，结构缺陷和针孔数量减少。结果，抑制了界面陷阱辅助的重组并促进了电荷提取。从机理上讲，我们表明在存在MAX的情况下，钙钛矿中的深层陷阱被钝化，陷阱中心的能量变得更浅。在这种情况下，陷阱对载流子运输和重组的负面影响得以缓解。
更新日期：2020-06-02
中文翻译：
表面改性剂可提高全无机CsPbI2Br钙钛矿太阳能电池的性能，效率接近15。
全无机钙钛矿太阳能电池（PSC）由于其有希望的热稳定性而备受关注，但其功率转换效率（PCE）较差，阻碍了其实际应用。在此，我们针对低温处理的无机CsPbI 2 Br太阳能电池提出了一种基于甲基卤化（MAX）的表面改性方法。引入的MAX改性剂的综合优点使功率转换效率提高到14.8％，CsPbI 2 Br PSC的FF达到了令人印象深刻的82.2％。我们加上光学建模实验分析表明，掺入MAX导致表面陷阱始发的有效钝化选自Pb 2+和我-离子CsPbI2 Br并同时介导CsPbI 2 Br的结晶，晶粒稍大，结构缺陷和针孔数量减少。结果，抑制了界面陷阱辅助的重组并促进了电荷提取。从机理上讲，我们表明在存在MAX的情况下，钙钛矿中的深层陷阱被钝化，陷阱中心的能量变得更浅。在这种情况下，陷阱对载流子运输和重组的负面影响得以缓解。
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