Department of Physics, Pukyong National University , Busan 608-737, South Korea.
Hybrid Interface Materials Global Frontier Research Group, Pusan National University , Busan 608-737, South Korea.
ACS Appl Mater Interfaces. 2017 Oct 4;9(39):33925-33933. doi: 10.1021/acsami.7b10022. Epub 2017 Sep 20.
The fundamental mechanism of grain growth evolution in the fabrication process from the precursor phase to the perovskite phase is not fully understood despite its importance in achieving high-quality grains in organic-inorganic hybrid perovskites, which are strongly affected by processing parameters. In this work, we investigate the fundamental conversion mechanism from the precursor phase of perovskite to the complete perovskite phase and how the intermediate phase promotes growth of the perovskite grains during the fabrication process. By monitoring the morphological evolution of the perovskite during the film fabrication process, we observed a clear rod-shaped intermediate phase in the highly crystalline perovskite and investigated the role of the nanorod intermediate phase on the growth of the grains of the perovskite film. Furthermore, on the basis of these findings, we developed a simple and effective method to tailor grain properties including the crystallinity, size, and number of grain boundaries, and then utilized the film with the tailored grains to develop perovskite solar cells.
尽管在实现高质量的有机-无机杂化钙钛矿晶粒方面，从前驱体相到钙钛矿相的晶粒生长演变的基本机制非常重要，但人们对此仍了解甚少，而这一过程强烈受到加工参数的影响。在这项工作中，我们研究了从钙钛矿前驱体相到完全钙钛矿相的基本转化机制，以及中间相在制备过程中如何促进钙钛矿晶粒的生长。通过监测钙钛矿在薄膜制备过程中的形态演变，我们在高结晶性钙钛矿中观察到了明显的棒状中间相，并研究了纳米棒中间相对钙钛矿薄膜晶粒生长的作用。此外，基于这些发现，我们开发了一种简单而有效的方法来调整晶粒特性，包括结晶度、尺寸和晶界数量，然后利用具有定制晶粒的薄膜来开发钙钛矿太阳能电池。
