Intermixing studies in GaN1-xSbx highly mismatched alloys

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Wendy L. Sarney
  • Stefan P. Svensson
  • Min Ting
  • Natalie Segercrantz

  • Wladek Walukiewicz
  • Kin Man Yu
  • Robert W. Martin
  • Sergei V. Novikov
  • C. T. Foxon

Research units

  • United States Army Research Laboratory
  • University of California at Berkeley
  • Lawrence Berkeley National Laboratory
  • City University of Hong Kong
  • University of Strathclyde
  • University of Nottingham

Abstract

GaN1-xSbx with x ∼ 5%-7% is a highly mismatched alloy predicted to have favorable properties for application as an electrode in a photoelectrochemical 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.

Details

Original languageEnglish
Pages (from-to)B64-B69
JournalApplied Optics
Volume56
Issue number3
Publication statusPublished - 20 Jan 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • Semiconductor materials, Optoelectronics, Thin films

ID: 10718336