Boron carbide amorphous solid with tunable band gap

JOURNAL OF ALLOYS AND COMPOUNDS

卷:861

Article

Tucker, Mikel¹  Liou, Sz-Chian²  Zondode, Mobolaji¹  Dampare, Jesse¹  Joseph, Halim C.^1,3  Ndaw, Marieme Soda¹  Hou, Jie¹  Pramanik, Saroj⁴  Du, Xiaobo⁸  Wu, Wei⁹  Talley, Jessye Leigh Bemley³  Lisfi, Abdellah¹  Fan, Maohong^6,7  Pan, Yong-Le⁵  Lan, Yucheng¹ 

[1] Morgan State Univ, Dept Phys & Engn Phys, Baltimore, MD 21251 USA

[2] Univ Maryland, Maryland NanoCtr, Adv Imaging & Microscope Lab, College Pk, MD 20742 USA

[3] Morgan State Univ, Dept Ind & Syst Engn, Baltimore, MD 21251 USA

[4] Morgan State Univ, Dept Biol, Baltimore, MD 21251 USA

[5] CCDC Army Res Lab, Adelphi, MD 20783 USA

[6] Univ Wyoming, Dept Chem, Laramie, WY 82071 USA

[7] Univ Wyoming, Dept Petr Engn, Laramie, WY 82071 USA

[8] Jilin Univ, Dept Phys, Changchun, Peoples R China

[9] UCL, London Ctr Nanotechnol, Gower St, London WC1E 6BT, England

关键词: Boride;    Carbide;    Optical;    Carbothermic reaction;    Photovoltaic;   

DOI  :  10.1016/j.jallcom.2020.157951

来源: Elsevier

【 摘 要 】

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 B x C 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. Published by Elsevier B.V.

【 授权许可】

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