Crystallization Dynamics of Organolead Halide Perovskite by Real-Time X-ray Diffraction
Crystallization Dynamics of Organolead Halide Perovskite by Real-Time X-ray Diffraction
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DOI：
10.1021/acs.nanolett.5b02402
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发表时间：
2015-08-01
期刊：
影响因子：
10.8
通讯作者：
Chikamatsu, Masayuki
中科院分区：
文献类型：
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作者：
Miyadera, Tetsuhiko;Shibata, Yosei;Chikamatsu, Masayuki
我们通过观察实时x射线衍射，在PbI薄膜与CH3NH3I溶液结合后，分析了CH3NH3PbI3钙钛矿的结晶过程。相变动力学的详细分析表明，CH3NH3I溶液在PM膜中的扩散是分形的。此外，发现钙钛矿晶体最初是基于PbI2晶体取向的，但逐渐过渡到随机取向。应控制钙钛矿结晶过程的波动特性，如分形渗透和取向转变，以制备高质量的钙钛矿晶体。本研究中观察到的特征反应动力学将有助于建立可重复的钙矿太阳能电池制造工艺。
We analyzed the crystallization process of the CH3NH3PbI3 perovskite by observing real-time X-ray diffraction immediately after combining a PbI, thin film with a CH3NH3I solution. A detailed analysis of the transformation kinetics demonstrated the fractal diffusion of the CH3NH3I solution into the PM, film. Moreover, the perovskite crystal was found to be initially oriented based on the PbI2 crystal orientation but to gradually transition to a random orientation. The fluctuating characteristics of the crystallization process of perovskites, such as fractal penetration and orientational transformation, should be controlled to allow the fabrication of high-quality perovsidte crystals. The characteristic reaction dynamics observed in this study should assist in establishing reproducible fabrication processes for perovsidte solar cells.