In-Situ Dynamic Observations of Perovskite Crystallization and Microstructure Evolution
Recently, Professor Zhu Rui and Professor Gong Qihuang at Department of Physics, Peking University working with the collaborators, Professor Thomas P. Russell and Dr. Feng Liu from Lawrence Berkeley National Laboratory, and Dr. Wei Zhang from University of Surrey, made important progress in studies of perovskite crystallization and microstructure evolution.
This research mainly focuses on the crystallization dynamics and growth mechanisms of hybrid lead halide perovskites via utilizing some advanced in-situ characterization techniques. The researchers performed the in-situ investigation of the perovskites crystallization kinetic and morphological evolution in real time from liquid precursor continually to the bulk polycrystal film. In-situ grazing incidence X-ray diffraction (GIXD) and Fourier transform infrared spectroscopy (FTIR) were utilized to reveal the crystallization dynamics and growth mechanism of perovskites over relevant temperature and time scales. The nano-assemble model from perovskite precursor solution, to the intermediated [PbI6]4- cage nanoparticels, and to the final bulk polycrystals was proposed to understand crystal structure and chemical transition at a molecular- or nano-scale level.
(a) 2D GIXD images of printing perovskite at different stages of drying process, (b) the nano-assemble model of perovskite crystallization, (c) the selected in-situ microcopy images of the perovskite films and (d) the scheme of the periodic and rhythmic crystallization.
This work was published in Nature Communications (Nat. Commun. 2017, 8, 15688). Hu Qin and Zhao Lichen from Professor Zhu’s group are the co-first authors. Professor Michael Gratzel in EPFL supported some constructive suggestions for the manuscript. This work was supported by the Ministry of Science and Technology of China, the National Natural Science Foundation of China, State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, 2011 Collaborative Innovation Center of Quantum Matter, China, Collaborative Innovation Center of Extreme Optics, 1000 Talents Program for Young Scientists of China, and Lawrence Berkeley National Laboratory.
Edited by: Zhang Jiang
Source: School of Physics