N incorporation and associated localized vibrational modes in GaSb

J. Buckeridge, D. O. Scanlon, T. D. Veal, M. J. Ashwin, A. Walsh, C. R A Catlow

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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.

Original languageEnglish
Article number014107
JournalPhysical Review B : Condensed Matter and Materials Physics
Volume89
Issue number1
DOIs
Publication statusPublished - 22 Jan 2014

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    Buckeridge, J., Scanlon, D. O., Veal, T. D., Ashwin, M. J., Walsh, A., & Catlow, C. R. A. (2014). N incorporation and associated localized vibrational modes in GaSb. Physical Review B : Condensed Matter and Materials Physics, 89(1), [014107]. https://doi.org/10.1103/PhysRevB.89.014107