Jiang Xiao, Wang Kai, Wang Hui, Duan Lianjie, Du Minyong, Wang Likun, Cao Yuexian, Liu Lu, Pang Shuping, Liu Shengzhong Frank
Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China.
University of the Chinese Academy of Sciences Beijing 100039 China.
Small Sci. 2021 Jan 15;1(2):2000054. doi: 10.1002/smsc.202000054. eCollection 2021 Feb.
Given that thermal stability is of considerable importance in the field of photovoltaics, inorganic perovskites have attracted numerous attempts to overcome instability caused by volatile cations in organic-inorganic hybrid perovskites. As always, crystallization optimization is a paramount strategy to enhance the performance of inorganic perovskite-based solar cells. Recently, nanoconfined crystallization is regarded as a novel and effective strategy due to the absence of chemical reactions. Herein, 1D ordered mesoporous silica is introduced into inorganic perovskite precursors to facilely induce the nanoconfined crystallization. Both theoretical and experimental analyses verify that the nanoconfined crystallization is successfully triggered by the ordered mesoporous silica, fostering the formation of 1D perovskite monocrystal. In addition, the crystallization and morphology of inorganic perovskite are effectively facilitated. As a result, the nonradiative recombination is suppressed along with the distinctly reduced trap-state density and remarkably enhanced charge transport in perovskite. Finally, the power conversion efficiencies of CsPbIBr- and CsPbI-based solar cells are boosted from 8.67% to 10.04% and from 14.10% to 14.69%, respectively. Meanwhile, stability tests of solar cells also show enhancement using the nanoconfined crystallization. This work provides a facile, effective, and flexible crystallization modulating strategy for fabricating efficient and stable inorganic perovskite solar cells.
鉴于热稳定性在光伏领域至关重要，无机钙钛矿已引发众多克服有机-无机杂化钙钛矿中挥发性阳离子导致的不稳定性的尝试。一如既往，结晶优化是提高无机钙钛矿基太阳能电池性能的首要策略。近来，由于不存在化学反应，纳米限域结晶被视为一种新颖且有效的策略。在此，将一维有序介孔二氧化硅引入无机钙钛矿前驱体中，以轻松诱导纳米限域结晶。理论和实验分析均证实，有序介孔二氧化硅成功触发了纳米限域结晶，促进了一维钙钛矿单晶的形成。此外，无机钙钛矿的结晶和形貌得到有效促进。结果，非辐射复合受到抑制，同时钙钛矿中的陷阱态密度明显降低，电荷传输显著增强。最终，基于CsPbIBr和CsPbI的太阳能电池的功率转换效率分别从8.67%提高到10.04%以及从14.10%提高到14.69%。同时，太阳能电池的稳定性测试也表明使用纳米限域结晶后稳定性有所增强。这项工作为制造高效稳定的无机钙钛矿太阳能电池提供了一种简便、有效且灵活的结晶调控策略。
