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Intermixing studies in GaN_1−xSb_x highly mismatched alloys

Sarney, Wendy L.; Svensson, Stefan P.; Ting, Min; Segercrantz, Natalie; Walukiewicz, Wladek; Yu, Kin Man; Martin, Robert W.; Novikov, Sergei V.; Foxon, C. T.


Wendy L. Sarney

Stefan P. Svensson

Min Ting

Natalie Segercrantz

Wladek Walukiewicz

Kin Man Yu

Robert W. Martin

Sergei V. Novikov

C. T. Foxon


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.

Journal Article Type Article
Publication Date Jan 20, 2017
Journal Applied Optics
Print ISSN 1559-128X
Electronic ISSN 2155-3165
Publisher Optical Society of America
Peer Reviewed Peer Reviewed
Volume 56
Issue 3
Article Number B64-B69
APA6 Citation Sarney, W. L., Svensson, S. P., Ting, M., Segercrantz, N., Walukiewicz, W., Yu, K. M., …Foxon, C. T. (2017). Intermixing studies in GaN_1−xSb_x highly mismatched alloys. Applied Optics, 56(3),
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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.


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