成核
同步加速器
原位
结晶
材料科学
钙钛矿(结构)
相(物质)
能量转换效率
产量(工程)
Crystal(编程语言)
化学物理
旋涂
衍射
结晶学
薄膜
纳米技术
光电子学
化学工程
物理
光学
化学
热力学
工程类
计算机科学
冶金
程序设计语言
有机化学
作者
Liang Kuai,Junnan Li,Yajuan Li,Yusheng Wang,Pandeng Li,Yuanshuai Qin,Tao Song,Yingguo Yang,Zhuoying Chen,Xingyu Gao,Baoquan Sun
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2019-11-12
卷期号:5 (1): 8-16
被引量:72
标识
DOI:10.1021/acsenergylett.9b02366
摘要
Quasi-two-dimensional (2D) perovskites promise intrinsically stable solar cell performance. However, the crystal orientation and phase distribution in 2D solution-processed perovskites are difficult to manipulate, which restricts the device efficiency as well as its reproducibility. Here, we simply incorporate potassium ion (K+) into a quasi-2D precursor solution, which can dramatically change the nucleation steps during the perovskite films spin-coating process probed by in situ synchrotron-based grazing incident X-ray diffraction (GIXRD). It is notable that a desired vertically oriented 2D phase without an intermediate compound can be easily formed after spin-coating, which simultaneously reduces the distribution of low-dimensional 2D perovskite phases in association with suppressed trap states. Therefore, the power conversion efficiency of doped 10% K+ 2D perovskite solar cells can yield up to 11.3% as well as long-term stable performance with high reproducibility. This work paves a key path to control the quasi-2D nucleation and crystallization processing via chemical additive.
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