Controlled Growth of Large-Area Bilayer Tungsten Diselenides with Lateral P-N Junctions

Srinivas V. Mandyam, Meng Qiang Zhao, Paul Masih Das, Qicheng Zhang, Christopher C. Price, Zhaoli Gao, Vivek B. Shenoy, Marija Drndić, Alan T.Charlie Johnson

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Bilayer two-dimensional (2D) van der Waals (vdW) materials are attracting increasing attention due to their predicted high quality electronic and optical properties. Here, we demonstrate dense, selective growth of WSe2 bilayer flakes by chemical vapor deposition with the use of a 1:10 molar mixture of sodium cholate and sodium chloride as the growth promoter to control the local diffusion of W-containing species. A large fraction of the bilayer WSe2 flakes showed a 0 (AB) and 60° (AA′) twist between the two layers, whereas Moiré 15 and 30° twist angles were also observed. Well-defined monolayer-bilayer junctions were formed in the as-grown bilayer WSe2 flakes, and these interfaces exhibited p-n diode rectification and an ambipolar transport characteristic. This work provides an efficient method for the layer-controlled growth of 2D materials, in particular, 2D transition metal dichalcogenides, and promotes their applications in next-generation electronic and optoelectronic devices.

Original languageEnglish (US)
Pages (from-to)10490-10498
Number of pages9
JournalACS Nano
Issue number9
StatePublished - Sep 24 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


  • bilayer WSe
  • controlled growth
  • growth promoter
  • monolayer-bilayer junction
  • two-dimensional materials


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