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N incorporation and associated localized vibrational modes in GaSb

Catlow, Charles Richard, Buckeridge, J., Scanlon, D.O., Veal, T.D., Ashwin, M.J. and Walsh, A. 2014. N incorporation and associated localized vibrational modes in GaSb. Physical Review B 89 (1) , 014107. 10.1103/PhysRevB.89.014107

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Abstract

We present results of electronic structure calculations on the N-related localized vibrational modes in the dilute nitride alloy GaSb1−xNx. By calculating the formation energies of various possible N incorporation modes in the alloy, we determine the most favorable N configurations, and we calculate their vibrational mode frequencies using density functional theory under the generalized gradient approximation to electron exchange and correlation, including the effects of the relativistic spin-orbit interactions. For a single N impurity, we find substitution on an Sb site, NSb, to be most favorable, and for a two-N-atom complex, we find the N-N split interstitial on an Sb site to be most favorable. For these defects, as well as, for comparison, defects comprising two N atoms on neighboring Sb sites and a N-Sb split interstitial on an Sb site, we find well-localized vibration modes (LVMs), which should be experimentally observable. The frequency of the triply degenerate LVM associated with NSb is determined to be 427.6 cm−1. Our results serve as a guide to future experimental studies to elucidate the incorporation of small concentrations of N in GaSb, which is known to lead to a reduction of the band gap and opens the possibility of using the material for long-wavelength applications.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: American Physical Society
ISSN: 2469-9969
Last Modified: 25 Feb 2019 12:25
URI: http://orca-mwe.cf.ac.uk/id/eprint/83931

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