Intermixing studies in GaN_1−xSb_x highly mismatched alloys

Sarney, Wendy L. and Svensson, Stefan P. and Ting, Min and Segercrantz, Natalie and Walukiewicz, Wladek and Yu, Kin Man and Martin, Robert W. and Novikov, Sergei V. and Foxon, C.T. (2017) Intermixing studies in GaN_1−xSb_x highly mismatched alloys. Applied Optics, 56 (3). B64-B69. ISSN 2155-3165

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Abstract

GaN1−xSbx with x~ 5-7% is a highly mismatched alloy predicted to have favorable properties for application as an electrode in a photo-electrochemical cell for solar water splitting. In this study, we grew GaN1−xSbx under conditions intended to induce phase segregation. Prior experiments with the similar alloy GaN1−xAsx, the tendency of Sb to surfact, and the low growth temperatures needed to incorporate Sb, all suggested that GaN1−xSbx alloys would likely exhibit phase segregation. We found that, except for very high Sb compositions, this was not the case, and that instead interdiffusion dominated. Characteristics measured by optical absorption were similar to intentionally grown bulk alloys for the same composition. Furthermore, the alloys produced by this method maintained crystallinity for very high Sb compositions, and allowed higher overall Sb compositions. This method may allow higher temperature growth while still achieving needed Sb compositions for solar water splitting applications.

Item Type: Article
Additional Information: © 2016 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1364/AO.56.000B64
Depositing User: Eprints, Support
Date Deposited: 04 Jan 2017 14:59
Last Modified: 12 May 2017 19:25
URI: http://eprints.nottingham.ac.uk/id/eprint/39580

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