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Kong, L.*; Gong, J.*; Hu, Q.*; Capitani, F.*; Celeste, A.*; Hattori, Takanori; Sano, Asami; Li, N.*; Yang, W.*; Liu, G.*; et al.
Advanced Functional Materials, 31(9), p.2009131_1 - 2009131_12, 2021/02
Times Cited Count:23 Percentile:80.82(Chemistry, Multidisciplinary)The soft nature of organic-inorganic halide perovskites renders their lattice particularly tunable to external stimuli such as pressure, undoubtedly offering an effective way to modify their structure for extraordinary optoelectronic properties. However, these soft materials meanwhile feature a general characteristic that even a very mild pressure will lead to detrimental lattice distortion and weaken the critical light-matter interaction, thereby triggering the performance degradation. Here, using the methylammonium lead iodide as a representative exploratory platform, we observed the pressure-driven lattice disorder can be significantly suppressed via hydrogen isotope effect, which is crucial for better optical and mechanical properties previously unattainable.
Okamoto, Yoshihiro; Fukushima, Kazuko*; Iwadate, Yasuhiko*
Journal of Non-Crystalline Solids, 312(314), p.450 - 453, 2002/10
Local structure of molten ZnBr was investigated by both of the Zn and the Br XAFS (X-ray absorption fine structure) measurements above their K-absorption edge at 723 K. The nearest Zn-Br distance was determined to be 2.46 for the Zn XAFS and 2.45 for the Br XAFS. The coordination number of Br ion around Zn was about 4. On the other hand, that of Zn ion around Br was about 2. The 1st Br-Br distance was estimated to be 3.9 . They shows that a tetrahedral coordinate (ZnBr) exists and most of the coordinate connects with the next ones through Br ion. The two XAFS functions in the molten ZnBr were reproduced by the combination of the molecular dynamics(MD) simulation and the FEFF7 computations.