New Study Uncovers Formation Mechanism of Metal Halide Perovskite


A research team led by SPST assistant Professor Chen Gang recently published a research paper in Advanced Functional Materials, ‘In Situ Observation of Crystallization Dynamics and Grain Orientation in Sequential Deposition of Metal Halide Perovskites,’ which was highlighted as a cover illustration.

Thin-film based perovskite solar cells exhibit stunning power conversion efficiency and pose a considerable challenge to the existing photovoltaic devices. These achievements are mainly attributed to the evolution of film processing methodologies among which the sequential deposition method is extremely effective in fabricating high quality perovskite films which deliver record device performances. Despite its apparent simplicity and success, the exact mechanism for the formation of ‘perfect’ perovskite films is yet ambiguous and warrants further investigations. 

Here, by conducting in situ real-time studies, the researchers mapped the panorama of the sequential deposition of FAPbI3 based perovskite film, where the chemical reaction, composition distribution, phase transition and crystal orientation evolution are fully surveyed. The present findings shed light on the preparation of highly efficient perovskite based solar cells and other optoelectronic devices with excellent perspectives.

The first author of this paper is Dr. Meng Ke, and Dr. Chen Gang is the corresponding author. This research work was financially supported by National Natural Science Foundation of China and ShanghaiTech start up funding.

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Cover illustration in Advanced Functional Materials

Research team from left: Xu Qiaofei, Wang Xiao, Chen Gang, Meng Ke, Li Zhimin and Liu Zhou