Lu Xinhui & Fang Guojia Matter: GIWAXS Reveals the Influence of Halogens on Crystallization and Phase Evolution in Inorganic Perovskite Thin Films
Release Date:
2020-11-16 15:15
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All-inorganic perovskite solar cells (PSCs) have garnered increasing attention due to their outstanding thermal stability, which is attributed to their potentially superior thermal robustness. However, the film-forming processes and phase-transition mechanisms of CsPbX3 thin films with different halide compositions (I, Br, Cl) remain poorly understood. Moreover, there is currently no consensus on the role of halide elements in the phase transitions and crystal-growth kinetics of all-inorganic perovskites. Researchers led by Xin-Hui Lu at the Chinese University of Hong Kong and Guo-Jia Fang at Wuhan University have employed state-of-the-art in situ grazing-incidence wide-angle X-ray scattering to investigate the real-time crystalline and phase evolution of all-inorganic perovskite thin films.
This study elucidates the roles of iodine, bromine, and chlorine in understanding the crystallization kinetics, phase transitions, and stability mechanisms of all-inorganic perovskites, as well as how these halide elements influence thin-film morphology and grain size. The findings are then correlated with device performance in all-inorganic perovskite solar cells, leading to the development of a simple yet innovative approach for fabricating high-efficiency, phase-stable ternary-halide (I, Br, Cl) all-inorganic perovskite solar cells with a record power conversion efficiency of 17.14%. These results provide valuable guidance for deepening our understanding of all-inorganic perovskite materials and pave the way for achieving high-performance all-inorganic PSCs.
Junjie Ma et al. Unraveling the Impact of Halide Mixing on Crystallization and Phase Evolution in CsPbX3 Perovskite Solar Cells, Matter, 2020
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