Synthesis of homogeneously alloyed Cu2-x(SySe 1-y) nanowire bundles with tunable compositions and bandgaps

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Jun Xu
  • Yong-Bing Tang
  • Xue Chen
  • Chun-Yan Luan
  • Wen-Feng Zhang
  • Xiang-Min Meng
  • Shuit-Tong Lee

Detail(s)

Original languageEnglish
Pages (from-to)4190-4195
Journal / PublicationAdvanced Functional Materials
Volume20
Issue number23
Publication statusPublished - 8 Dec 2010

Abstract

Bundles of homogeneously alloyed Cu2-x(SySe 1-y) nanowires with various compositions (0 ≤ γ ≤ 1) are controllably prepared via a simple water-evaporation method under mild conditions. It is found that the nanowire bundles have similar copper contents (0.37 ≤x ≤ 0.44) and morphologies, and the same face centered cubic (fcc) crystal structure and growth orientation of [110] over the entire composition range of y. To the best of the authors' knowledge, this is the first report on cubic phased ternary Cu2-x(SySe1-y) compounds. It is found that lattice parameter of the Cu2-x(SySe 1-y) compound changes linearly with the S content. It is also shown that the direct and the indirect bandgaps of the nanowires vary quadratically with the S content and have bowing parameters of 0.20 and 0.21 eV respectively. Energy-gap-tuning via compositional change is achieved for both the direct (1.48-1.87 eV) and the indirect (0.50-0.90 eV) bandgaps. The trends of lattice parameter and bandgap variations are consistent with those described by Végard's Law. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Research Area(s)

  • copper chalcogenides, nanowires, ternary alloy, tunable bandgap, Végard's Law

Citation Format(s)

Synthesis of homogeneously alloyed Cu2-x(SySe 1-y) nanowire bundles with tunable compositions and bandgaps. / Xu, Jun; Tang, Yong-Bing; Chen, Xue; Luan, Chun-Yan; Zhang, Wen-Feng; Zapien, Juan Antonio; Zhang, Wen-Jun; Kwong, Hoi-Lun; Meng, Xiang-Min; Lee, Shuit-Tong; Lee, Chun-Sing.

In: Advanced Functional Materials, Vol. 20, No. 23, 08.12.2010, p. 4190-4195.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal