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Cation-Assisted Restraint of a Wide Quantum Well and Interfacial Charge Accumulation in Two-Dimensional Perovskites
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acsenergylett.8b00683 Hao Li 1 , Jianfeng Lu 2 , Tao Zhang 1 , Yan Shen 1 , Mingkui Wang 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acsenergylett.8b00683 Hao Li 1 , Jianfeng Lu 2 , Tao Zhang 1 , Yan Shen 1 , Mingkui Wang 1
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Two-dimensional (2D) layered perovskite compounds hold promise to solve stability issues for photovoltaic devices. However, the naturally formed multiple quantum well structure contributes to a large distribution of optical band gaps in 2D perovskite materials. Therefore, intensive efforts have been devoted to control the quantum well width into an extremely small distribution and optimize the charge-transport characteristic. Herein, we report that a cation-induced recrystallization process (CIRP) can form well alignment orientation and increase the crystallinity of 2D perovskite (BA)2(CH3NH3)3Pb4I13 (where BA is butylammonium) via an intermediate catalytic effect. More importantly, CIRP treatment enables a homogeneous distribution of organic cations, narrows the distribution of the quantum well width, and reduces charge accumulation as well. The 2D perovskite devices with CIRP treatment using a metal oxide TiO2/Al2O3/NiO/C framework exhibited an impressive power conversion efficiency of 8.2%, which is the highest value among its counterpart category. The super stability has been verified in air (sustained origin efficiency until 4000 h).
中文翻译：
二维量子钙钛矿中阳离子辅助的宽量子阱约束和界面电荷积累
二维（2D）层状钙钛矿化合物有望解决光伏器件的稳定性问题。然而，自然形成的多量子阱结构有助于二维钙钛矿材料中光学带隙的大分布。因此，已经致力于将量子阱宽度控制到极小的分布并优化电荷传输特性。本文中，我们报道阳离子诱导的重结晶过程（CIRP）可以形成良好的取向取向并增加2D钙钛矿（BA）2（CH 3 NH 3）3 Pb 4 I 13的结晶度（其中BA是丁基铵）通过中间催化作用。更重要的是，CIRP处理可实现有机阳离子的均匀分布，缩小量子阱宽度的分布，并减少电荷积聚。使用金属氧化物TiO 2 / Al 2 O 3 / NiO / C框架进行CIRP处理的2D钙钛矿器件的功率转换效率高达8.2％，是同类产品中最高的。空气中的超稳定性已得到验证（直到4000小时的持续原点效率）。
更新日期：2018-07-05
中文翻译：
二维量子钙钛矿中阳离子辅助的宽量子阱约束和界面电荷积累
二维（2D）层状钙钛矿化合物有望解决光伏器件的稳定性问题。然而，自然形成的多量子阱结构有助于二维钙钛矿材料中光学带隙的大分布。因此，已经致力于将量子阱宽度控制到极小的分布并优化电荷传输特性。本文中，我们报道阳离子诱导的重结晶过程（CIRP）可以形成良好的取向取向并增加2D钙钛矿（BA）2（CH 3 NH 3）3 Pb 4 I 13的结晶度（其中BA是丁基铵）通过中间催化作用。更重要的是，CIRP处理可实现有机阳离子的均匀分布，缩小量子阱宽度的分布，并减少电荷积聚。使用金属氧化物TiO 2 / Al 2 O 3 / NiO / C框架进行CIRP处理的2D钙钛矿器件的功率转换效率高达8.2％，是同类产品中最高的。空气中的超稳定性已得到验证（直到4000小时的持续原点效率）。
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