Vapor-transport growth of high optical quality WSe2 monolayers

Genevieve Clark, Sanfeng Wu, Pasqual Rivera, Joseph Finney, Paul Nguyen, David H. Cobden, Xiaodong Xu

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Monolayer transition metal dichalcogenides are atomically thin direct-gap semiconductors that show a variety of novel electronic and optical properties with an optically accessible valley degree of freedom. While they are ideal materials for developing optical-driven valleytronics, the restrictions of exfoliated samples have limited exploration of their potential. Here, we present a physical vapor transport growth method for triangular WSe2 sheets of up to 30 μm in edge length on insulating SiO2 substrates. Characterization using atomic force microscopy and optical microscopy reveals that they are uniform, monolayer crystals. Low temperature photoluminescence shows well resolved and electrically tunable excitonic features similar to those in exfoliated samples, with substantial valley polarization and valley coherence. The monolayers grown using this method are therefore of high enough optical quality for routine use in the investigation of optoelectronics and valleytronics.

Original languageEnglish (US)
Article number101101
JournalAPL Materials
Volume2
Issue number10
DOIs
StatePublished - Oct 1 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

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    Clark, G., Wu, S., Rivera, P., Finney, J., Nguyen, P., Cobden, D. H., & Xu, X. (2014). Vapor-transport growth of high optical quality WSe2 monolayers. APL Materials, 2(10), [101101]. https://doi.org/10.1063/1.4896591