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Simultaneous Evolution of Uniaxially Oriented Grains and Ultralow-Density Grain-Boundary Network in CH3NH3PbI3 Perovskite Thin Films Mediated by Precursor Phase Metastability
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acsenergylett.7b00980 Fuxiang Ji 1 , Shuping Pang 1 , Lin Zhang 2 , Yingxia Zong 1, 2 , Guanglei Cui 1 , Nitin P. Padture 2 , Yuanyuan Zhou 2
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acsenergylett.7b00980 Fuxiang Ji 1 , Shuping Pang 1 , Lin Zhang 2 , Yingxia Zong 1, 2 , Guanglei Cui 1 , Nitin P. Padture 2 , Yuanyuan Zhou 2
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Solution-processed organic–inorganic halide perovskite (OIHP) thin films typically contain fine, randomly oriented grains and a high-density grain-boundary network, which are unfavorable for key film functions including charge transport and environmental stability. Here, we report a new chemical route for achieving CH3NH3PbI3 (MAPbI3) OIHP thin films comprising large, uniaxially oriented grains and an ultralow-density grain-boundary network. This route starts with a new metastable liquid-state precursor phase, MAPbI3·MACl·xCH3NH2, which converts to metastable MAPbI3·MACl and then to MAPbI3 OIHP upon stepwise release of volatile CH3NH2 and MACl. Perovskite solar cells made via this route show high power conversion efficiency of up to 19.4%, with significantly enhanced environmental stability.
中文翻译：
前体相亚稳介导的CH 3 NH 3 PbI 3钙钛矿薄膜中单轴取向晶粒和超低密度晶界网络的同时演化
固溶处理的有机-无机卤化物钙钛矿（OIHP）薄膜通常包含细小的，随机取向的晶粒和高密度的晶粒边界网络，这不利于关键的薄膜功能，包括电荷传输和环境稳定性。这里，我们报告一个新的化学途径实现CH 3 NH 3碘化铅3（MAPbI 3）OIHP薄膜包括大的，单轴取向的晶粒和超低密度晶界网络。该路线始于新的亚稳态液态前体相MAPbI 3 ·MACl· x CH 3 NH 2，其先转变为亚稳态MAPbI 3 ·MACl，然后再转变为MAPbI 3逐步释放挥发性CH 3 NH 2和MAC1后的OIHP。通过这种方法制造的钙钛矿太阳能电池显示出高达19.4％的高功率转换效率，并显着增强了环境稳定性。
更新日期：2017-11-08
中文翻译：
前体相亚稳介导的CH 3 NH 3 PbI 3钙钛矿薄膜中单轴取向晶粒和超低密度晶界网络的同时演化
固溶处理的有机-无机卤化物钙钛矿（OIHP）薄膜通常包含细小的，随机取向的晶粒和高密度的晶粒边界网络，这不利于关键的薄膜功能，包括电荷传输和环境稳定性。这里，我们报告一个新的化学途径实现CH 3 NH 3碘化铅3（MAPbI 3）OIHP薄膜包括大的，单轴取向的晶粒和超低密度晶界网络。该路线始于新的亚稳态液态前体相MAPbI 3 ·MACl· x CH 3 NH 2，其先转变为亚稳态MAPbI 3 ·MACl，然后再转变为MAPbI 3逐步释放挥发性CH 3 NH 2和MAC1后的OIHP。通过这种方法制造的钙钛矿太阳能电池显示出高达19.4％的高功率转换效率，并显着增强了环境稳定性。
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