Direct Synthesis of Large-Scale WTe 2 Thin Films with Low Thermal Conductivity

Yu Zhou, Hyejin Jang, John M. Woods, Yujun Xie, Piranavan Kumaravadivel, Grace A. Pan, Jingbei Liu, Yanhui Liu, David G Cahill, Judy J. Cha

Research output: Contribution to journalArticle

Abstract

Large-scale, polycrystalline WTe 2 thin films are synthesized by atmospheric chemical vapor reaction of W metal films with Te vapor catalyzed by H 2 Te intermediates, paving a way to understanding the synthesis mechanism for low bonding energy tellurides and toward synthesis of single-crystalline telluride nanoflakes. Through-plane and in-plane thermal conductivities of single-crystal WTe 2 flakes and polycrystalline WTe 2 thin films are measured for the first time. Nanoscale grains and disorder in WTe 2 thin films suppress the in-plane thermal conductivity of WTe 2 greatly, which is at least 7.5 times lower than that of the single-crystalline flakes.

Original languageEnglish (US)
Article number1605928
JournalAdvanced Functional Materials
Volume27
Issue number8
DOIs
StatePublished - Feb 23 2017

    Fingerprint

Keywords

  • WTe
  • chemical vapor deposition
  • intermediate H Te
  • nanostructure engineering
  • thermal conductivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Zhou, Y., Jang, H., Woods, J. M., Xie, Y., Kumaravadivel, P., Pan, G. A., Liu, J., Liu, Y., Cahill, D. G., & Cha, J. J. (2017). Direct Synthesis of Large-Scale WTe 2 Thin Films with Low Thermal Conductivity Advanced Functional Materials, 27(8), [1605928]. https://doi.org/10.1002/adfm.201605928