81Br NQR and 119Sn Mössbauer Spectra for SnBr3− Anions

Abstract

The structures of the SnBr3− anions in MSnBr3 (M=(CH3)2NH2, (CH3)3NH) and MSnBr3·H2O (M=K, NH4) were deduced by means of 81Br NQR spectroscopy. The former compounds have three 81Br NQR lines in the frequency range 73–80 MHz at 77 K, indicating the presence of pyramidal SnBr3− anions. The anion structure of the latter hydrate, on the other hand, was presumed to be square-pyramid with one terminal and two bridging Br atoms, because two of the 81Br NQR frequencies were considerably low compared with that of the terminal atom. Phase transitions were observed for the latter hydrates. Associated with these, drastic increases of the NQR frequencies were observed only for the bridging atoms, suggesting significant changes in the bridging network.

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Tin-based halide perovskite materials: properties and applications

“…4 From 1980-90s, optical and electrical properties of threedimensional (3D) and layered organic-inorganic, i.e., twodimensional (2D), metal halide perovskites were studied by Mitzi at IBM for mainly luminescence and transistor applications [5][6][7] and by others. [8][9][10] In 2009, Miyasaka et al 11 reported on the rst perovskite solar cells (PSCs) impacting the photovoltaic research eld signicantly. 12,13 Within a few years, they compete with established technologies in terms of power conversion efficiency (PCE) with 25.7% in 2022 (ref.…”

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