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The 1280 Cm−1 Absorption Line in Amorphous Hydrogenated Boron Carbide

Published online by Cambridge University Press:  10 February 2011

Shu-Han Lin  and
Bernard J. Feldman
Shu-Han Lin
Affiliation:
Department of Physics and the Center for Molecular Electronics, University of Missouri, St. Louis, MO 63121, C4840@jinx.umsl.edu
Bernard J. Feldman
Affiliation:
Department of Physics and the Center for Molecular Electronics, University of Missouri, St. Louis, MO 63121, C4840@jinx.umsl.edu
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Abstract

We report infrared absorption measurements that provide evidence for the presence of boron carbide icosahedra in amorphous hydrogenated boron carbide thin films. The infrared absorption spectra is dominated by an intense line at 1280 cm-1 with a FWHM of ≃320 cm-1. Similar lines have been previously reported in polycrystalline boron carbide, where boron carbide icosahedra make up the unit cell. In both systems, the linewidth narrows and the peak position shifts to higher energy with increasing carbon concentrations. From annealing studies of amorphous hydrogenated boron carbide, hydrogen plays a very small role in the 1280 cm-1 line. Finally, the integrated intensity of the 1280 cm-1 line is a sublinear function of the boron concentration, providing further evidence that the carbon concentration in these icosahedra increases as the carbon concentration of the film increases.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 517: Symposium F – Wide Bandgap Semiconductors for High Power, High Frequency , January 1998 , 433
Copyright
Copyright © Materials Research Society 1998

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