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Mixed valence Sn doped (CH3NH3)3Bi2Br9 produced by mechanochemical synthesis

Palgrave, R; Perry, Robin; Jia, X; Liu, Yuhan; Parkin, Ivan; (2023) Mixed valence Sn doped (CH3NH3)3Bi2Br9 produced by mechanochemical synthesis. Physical Chemistry Chemical Physics , 25 (6) pp. 4563-4569. 10.1039/D2CP04487K. Green open access

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Abstract

Bismuth halides with formula A3Bi2X9, where A is an inorganic or organic cation, show desirable properties as solar absorbers and luminescent materials. Control of structural and electronic dimensionality of these compounds is important to yield materials with good light absorption and charge transport. Here we report mechanochemical reaction of (CH3NH3)3Bi2Br9 with SnBr2 at room temperature in air, yielding a material with strong absorption across the visible region. We attribute this to mixed valence doping of Sn(II) and Sn(IV) on the Bi site. X-ray diffraction shows no secondary phases, even after heating at 200oC to improve crystallinity. X-ray photoelectron spectroscopy suggests the presence of Sn(II) and Sn(IV) states. A similar approach to dope Sn into the iodide analogue (CH3NH3)3Bi2I9 was unsuccessful.

Type: Article
Title: Mixed valence Sn doped (CH3NH3)3Bi2Br9 produced by mechanochemical synthesis
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/D2CP04487K
Publisher version: https://doi.org/10.1039/D2CP04487K
Language: English
Additional information: This article is licensed under a Creative Commons Attribution-Non Commercial 3.0 Unported Licence (http://creativecommons.org/licenses/by-nc/3.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10159673
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