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Boron carbide amorphous solid with tunable band gap

Tucker, M; Liou, S-C; Zondode, M; Dampare, J; Joseph, HC; Ndaw, MS; Hou, J; ... Lan, Y; + view all (2021) Boron carbide amorphous solid with tunable band gap. Journal of Alloys and Compounds , 861 , Article 157951. 10.1016/j.jallcom.2020.157951. Green open access

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Abstract

Boron carbide BxC (x = 1/6 − 10) powders were synthesized through a microwave-assisted carbothermic reduction reaction as a potential clean energy material. Their crystallographic structures and optical properties were characterized. X-ray diffraction and electron diffraction indicated that the synthesized BxC powders were amorphous. Electron energy-loss spectroscopy demonstrated that the composition of boron and carbon was in amorphous materials, and their chemical bonding were disclosed from Raman scattering spectroscopy. UV–vis absorption spectroscopy indicated that the bandgap of the bulks varied from 2.30eV to 3.90eV, tuned by the boron/carbon element ratio. The synthesized powders were potential photovoltaic materials. A short-range ordering model was established to explain the optical properties.

Type: Article
Title: Boron carbide amorphous solid with tunable band gap
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jallcom.2020.157951
Publisher version: https://doi.org/10.1016/j.jallcom.2020.157951
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Boride, Carbide, Optical, Carbothermic reaction, Photovoltaic
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 > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/10141882
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