Large-Area synthesis of WSe2 from WO3 by selenium-oxygen ion exchange

Paul Browning, Sarah Eichfeld, Kehao Zhang, Lorraine Hossain, Yu Chuan Lin, Ke Wang, Ning Lu, A. R. Waite, A. A. Voevodin, Moon Kim, Joshua A. Robinson

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Few-layer tungsten diselenide (WSe2) is attractive as a next-generation electronic material as it exhibits modest carrier mobilities and energy band gap in the visible spectra, making it appealing for photovoltaic and low-powered electronic applications. Here we demonstrate the scalable synthesis of large-Area, few-layer WSe2 via replacement of oxygen in hexagonally stabilized tungsten oxide films using dimethyl selenium. Cross-sectional transmission electron microscopy reveals successful control of the final WSe2 film thickness through control of initial tungsten oxide thickness, as well as development of layered films with grain sizes up to several hundred nanometers. Raman spectroscopy and atomic force microscopy confirms high crystal uniformity of the converted WSe2, and time domain thermo-reflectance provide evidence that near record low thermal conductivity is achievable in ultrathin WSe2 using this method.

Original languageEnglish (US)
Article numberA8
Journal2D Materials
Volume2
Issue number1
DOIs
StatePublished - Jan 13 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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