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Controlled Growth of Large-Area Bilayer Tungsten Diselenides with Lateral P-N Junctions
- Publication Year :
- 2019
- Publisher :
- arXiv, 2019.
-
Abstract
- 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 WSe(2) 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 WSe(2) flakes showed a 0 (AB) and 60° (AA’) twist between the two layers, while moiré 15 and 30°-twist angles were also observed. Well-defined monolayer-bilayer junctions were formed in the as-grown bilayer WSe(2) 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.
- Subjects :
- Materials science
Diffusion
General Physics and Astronomy
chemistry.chemical_element
FOS: Physical sciences
02 engineering and technology
Chemical vapor deposition
Tungsten
010402 general chemistry
01 natural sciences
Article
symbols.namesake
Transition metal
General Materials Science
Diode
Condensed Matter - Materials Science
Ambipolar diffusion
Bilayer
General Engineering
Materials Science (cond-mat.mtrl-sci)
021001 nanoscience & nanotechnology
0104 chemical sciences
chemistry
Chemical physics
symbols
van der Waals force
0210 nano-technology
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....e3bf3dc4a626d56699c938a80e73195b
- Full Text :
- https://doi.org/10.48550/arxiv.1908.09013