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如何利用溶液法制备高质量、高效率的有机-无机杂化钙钛矿薄膜光电器件,取决于对该体系的核化和晶体生长机理的深入研究.尽管用很多方法可以制备出高性能的钙钛矿薄膜,到目前为止,还缺乏一个准确且统一的模型,去解释钙钛矿晶体是如何从溶液中析出生长的过程.本文通过对晶体核化和生长动力学的详细研究,提出了有机-无机杂化钙钛矿薄膜材料的形成机制.通过精准控制钙钛矿晶粒生长的条件,异质晶核之间的距离能够在几百纳米到几百微米之间调控.我们还发现在晶核周围直径超过100微米范围,聚集着取向高度一致的晶体团簇.但是这些晶体团簇的尺寸大小,与提高钙钛矿光电器件的性能并没有什么直接的对应关系;钙钛矿材料微观结构的形成机理,兼有经典和非经典晶体生长的特征.因此对钙钛矿薄膜生长的深入研究,将有助于进一步控制杂化钙钛矿薄膜的微观结构.
How to use the solution method to prepare high-quality and high-efficiency organic-inorganic hybrid perovskite thin-film optoelectronic devices depends on the nucleation and crystal growth mechanism of the system in-depth study.Although many methods can be used to prepare high-performance calcium To date, there is still a lack of an accurate and unified model to explain how perovskite crystals are precipitated from solution.In this paper, through detailed study of nucleation and growth kinetics, - Formation mechanism of inorganic hybrid perovskite thin film material By precisely controlling the conditions of perovskite grain growth, the distance between heterogeneous nuclei can be controlled between a few hundred nanometers and several hundred micrometers.We also found that at However, the size of these crystal clusters does not directly correlate with the improvement of the performance of the perovskite optoelectronic devices. The microstructure of perovskite materials Structure formation mechanism, and the characteristics of both classical and non-classical crystal growth.Therefore, in-depth study on the growth of perovskite thin films will help to further control the hybrid perovskite thin Membrane microstructure.