Anionic order and band gap engineering in vacancy ordered triple perovskites

Chemical Communications : Chem Comm
Taylor L HodgkinsBrent C Melot

Abstract

We demonstrate that the optical absorption of the vacancy-ordered triple perovskite, Cs3Bi2Br9, can be significantly red-shifted by substituting Br with I while maintaining the layered structural topology. We also present evidence that Br ions prefer to occupy the bridging halide position within the layers in order to minimize strain within the lattice that results from the incorporation of the significantly larger iodide anions into the lattice. These results not only quantify the upper limit for I content in the layered polymorph, but also establish the minimum band gap obtainable from these Bi-based phases.

Citations

Nov 9, 2019·Chemical Communications : Chem Comm·Bo KouJunhua Luo
Dec 2, 2020·Nanotechnology·Yi-Teng HuangRobert L Z Hoye
Nov 25, 2020·Inorganic Chemistry·Takafumi YamamotoJames R Neilson
Aug 24, 2019·The Journal of Physical Chemistry Letters·Yang-Peng LinKe-Zhao Du
Jun 13, 2020·ACS Applied Materials & Interfaces·Di LiuZhubing He
Jan 26, 2022·The Journal of Physical Chemistry Letters·Chunbao FengGang Zhang

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Methods Mentioned

BETA
synchrotron diffraction
X-ray

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