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

doi:10.1021/acsnano.9b04453

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 journal › Article › peer-review

47 Scopus citations

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 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 language	English (US)
Pages (from-to)	10490-10498
Number of pages	9
Journal	ACS Nano
Volume	13
Issue number	9
DOIs	https://doi.org/10.1021/acsnano.9b04453
State	Published - Sep 24 2019
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Materials Science
General Engineering
General Physics and Astronomy

Keywords

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

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10.1021/acsnano.9b04453

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title = "Controlled Growth of Large-Area Bilayer Tungsten Diselenides with Lateral P-N Junctions",

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 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 Moir{\'e} 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.",

keywords = "bilayer WSe, controlled growth, growth promoter, monolayer-bilayer junction, two-dimensional materials",

author = "Mandyam, \{Srinivas V.\} and Zhao, \{Meng Qiang\} and \{Masih Das\}, Paul and Qicheng Zhang and Price, \{Christopher C.\} and Zhaoli Gao and Shenoy, \{Vivek B.\} and Marija Drndi{\'c} and Johnson, \{Alan T.Charlie\}",

note = "Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

year = "2019",

month = sep,

day = "24",

doi = "10.1021/acsnano.9b04453",

language = "English (US)",

volume = "13",

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journal = "ACS Nano",

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T1 - Controlled Growth of Large-Area Bilayer Tungsten Diselenides with Lateral P-N Junctions

AU - Mandyam, Srinivas V.

AU - Zhao, Meng Qiang

AU - Masih Das, Paul

AU - Zhang, Qicheng

AU - Price, Christopher C.

AU - Gao, Zhaoli

AU - Shenoy, Vivek B.

AU - Drndić, Marija

AU - Johnson, Alan T.Charlie

PY - 2019/9/24

Y1 - 2019/9/24

N2 - 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.

AB - 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.

KW - bilayer WSe

KW - controlled growth

KW - growth promoter

KW - monolayer-bilayer junction

KW - two-dimensional materials

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JF - ACS Nano

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

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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