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Deep‐Ultraviolet Photoactivation‐Assisted Contact Engineering Toward High‐Efficiency and Stable All‐Inorganic CsPbI2Br Perovskite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-02-18 , DOI: 10.1002/solr.202000001 Long Zhou 1 , Jie Su 1 , Zhenhua Lin 1 , Xing Guo 1 , Jing Ma 1 , Liping Feng 2 , Jincheng Zhang 1 , Shen Wang 3 , Shengzhong (Frank) Liu 4 , Jingjing Chang 1 , Yue Hao 1
Solar RRL ( IF 6.0 ) Pub Date : 2020-02-18 , DOI: 10.1002/solr.202000001 Long Zhou 1 , Jie Su 1 , Zhenhua Lin 1 , Xing Guo 1 , Jing Ma 1 , Liping Feng 2 , Jincheng Zhang 1 , Shen Wang 3 , Shengzhong (Frank) Liu 4 , Jingjing Chang 1 , Yue Hao 1
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All‐inorganic perovskite CsPbI2Br have been regarded as a promising candidate to tackle the thermal instability issue of organic–inorganic perovskite solar cells. However, the serious interfacial charge recombination and large voltage potential loss in cells circumscribe their performance and commercialization. Herein, a facile approach is demonstrated in which the SnO2 electron transport layer is modified with short‐period deep‐ultraviolet (DUV) photoactivation process to decrease the work function and achieve better energy alignment with the conduction band of perovskites. Such modification triggers efficient charge transfer and reduces the charge recombination. Moreover, first‐principles calculation further demonstrates that DUV‐treated SnO2 can strengthen the interface interaction, reduce the interface stress caused by lattice mismatch, induce more ordered perovskite structure, enlarge transfer charge from 0.71 to 2.33 e, gain larger built‐in field (from 0.74 to 2.09 eV), lower work function, and smaller conduction band offset. Thus, all‐inorganic CsPbI2Br solar cells based on DUV‐treated SnO2 exhibit a significant enhancement in power conversion efficiency, and the champion cell achieves an elevated efficiency of 15.1% with a superior Voc of 1.22 V and better stability.
中文翻译：
高效，稳定的全无机CsPbI2Br钙钛矿太阳能电池的深紫外光活化辅助接触工程
全无机钙钛矿CsPbI 2 Br被认为是解决有机-无机钙钛矿太阳能电池热不稳定性问题的有前途的候选人。然而，电池中严重的界面电荷复合和大的电压电势损失限制了它们的性能和商业化。本文证明了一种简便的方法，其中利用短周期深紫外（DUV）光活化工艺对SnO 2电子传输层进行改性，以降低其功函并与钙钛矿的导带实现更好的能量对准。这种修饰触发有效的电荷转移并减少电荷复合。此外，第一性原理计算进一步证明了DUV处理的SnO 2可以增强界面相互作用，减少由晶格失配引起的界面应力，诱导更多有序的钙钛矿结构，将转移电荷从0.71扩大到2.33 e，获得更大的内置场（从0.74到2.09 eV），降低功函，并且更小导带偏移。因此，基于DUV处理的SnO 2的全无机CsPbI 2 Br太阳能电池的功率转换效率显着提高，冠军电池的V oc为1.22 V，稳定性更高，效率提高了15.1％。
更新日期：2020-02-18
中文翻译：
高效，稳定的全无机CsPbI2Br钙钛矿太阳能电池的深紫外光活化辅助接触工程
全无机钙钛矿CsPbI 2 Br被认为是解决有机-无机钙钛矿太阳能电池热不稳定性问题的有前途的候选人。然而，电池中严重的界面电荷复合和大的电压电势损失限制了它们的性能和商业化。本文证明了一种简便的方法，其中利用短周期深紫外（DUV）光活化工艺对SnO 2电子传输层进行改性，以降低其功函并与钙钛矿的导带实现更好的能量对准。这种修饰触发有效的电荷转移并减少电荷复合。此外，第一性原理计算进一步证明了DUV处理的SnO 2可以增强界面相互作用，减少由晶格失配引起的界面应力，诱导更多有序的钙钛矿结构，将转移电荷从0.71扩大到2.33 e，获得更大的内置场（从0.74到2.09 eV），降低功函，并且更小导带偏移。因此，基于DUV处理的SnO 2的全无机CsPbI 2 Br太阳能电池的功率转换效率显着提高，冠军电池的V oc为1.22 V，稳定性更高，效率提高了15.1％。
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