Spectroscopic signatures for interlayer coupling in MoS2-WSe2 van der waals stacking

Ming Hui Chiu; Ming Yang Li; Wengjing Zhang; Wei Ting Hsu; Wen Hao Chang; Mauricio Terrones; Humberto Terrones; Lain Jong Li

doi:10.1021/nn504229z

Spectroscopic signatures for interlayer coupling in MoS₂-WSe₂ van der waals stacking

Ming Hui Chiu, Ming Yang Li, Wengjing Zhang, Wei Ting Hsu, Wen Hao Chang, Mauricio Terrones, Humberto Terrones, Lain Jong Li

Research output: Contribution to journal › Article › peer-review

291 Scopus citations

Abstract

Stacking of MoS₂ and WSe₂ monolayers is conducted by transferring triangular MoS₂ monolayers on top of WSe₂ monolayers, all grown by chemical vapor deposition (CVD). Raman spectroscopy and photoluminescence (PL) studies reveal that these mechanically stacked monolayers are not closely coupled, but after a thermal treatment at 300 °C, it is possible to produce van der Waals solids consisting of two interacting transition metal dichalcogenide (TMD) monolayers. The layer-number sensitive Raman out-of-plane mode A²_1g for WSe₂ (309 cm^-1) is found sensitive to the coupling between two TMD monolayers. The presence of interlayer excitonic emissions and the changes in other intrinsic Raman modes such as E′ for MoS₂ at 286 cm^-1 and A²_1g for MoS₂ at around 463 cm^-1 confirm the enhancement of the interlayer coupling.

Original language	English (US)
Pages (from-to)	9649-9656
Number of pages	8
Journal	ACS nano
Volume	8
Issue number	9
DOIs	https://doi.org/10.1021/nn504229z
State	Published - Sep 23 2014

All Science Journal Classification (ASJC) codes

General Materials Science
General Engineering
General Physics and Astronomy

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10.1021/nn504229z

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title = "Spectroscopic signatures for interlayer coupling in MoS2-WSe2 van der waals stacking",

abstract = "Stacking of MoS2 and WSe2 monolayers is conducted by transferring triangular MoS2 monolayers on top of WSe2 monolayers, all grown by chemical vapor deposition (CVD). Raman spectroscopy and photoluminescence (PL) studies reveal that these mechanically stacked monolayers are not closely coupled, but after a thermal treatment at 300 °C, it is possible to produce van der Waals solids consisting of two interacting transition metal dichalcogenide (TMD) monolayers. The layer-number sensitive Raman out-of-plane mode A21g for WSe2 (309 cm-1) is found sensitive to the coupling between two TMD monolayers. The presence of interlayer excitonic emissions and the changes in other intrinsic Raman modes such as E′ for MoS2 at 286 cm-1 and A21g for MoS2 at around 463 cm-1 confirm the enhancement of the interlayer coupling.",

author = "Chiu, {Ming Hui} and Li, {Ming Yang} and Wengjing Zhang and Hsu, {Wei Ting} and Chang, {Wen Hao} and Mauricio Terrones and Humberto Terrones and Li, {Lain Jong}",

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T1 - Spectroscopic signatures for interlayer coupling in MoS2-WSe2 van der waals stacking

AU - Chiu, Ming Hui

AU - Li, Ming Yang

AU - Zhang, Wengjing

AU - Hsu, Wei Ting

AU - Chang, Wen Hao

AU - Terrones, Mauricio

AU - Terrones, Humberto

AU - Li, Lain Jong

PY - 2014/9/23

Y1 - 2014/9/23

N2 - Stacking of MoS2 and WSe2 monolayers is conducted by transferring triangular MoS2 monolayers on top of WSe2 monolayers, all grown by chemical vapor deposition (CVD). Raman spectroscopy and photoluminescence (PL) studies reveal that these mechanically stacked monolayers are not closely coupled, but after a thermal treatment at 300 °C, it is possible to produce van der Waals solids consisting of two interacting transition metal dichalcogenide (TMD) monolayers. The layer-number sensitive Raman out-of-plane mode A21g for WSe2 (309 cm-1) is found sensitive to the coupling between two TMD monolayers. The presence of interlayer excitonic emissions and the changes in other intrinsic Raman modes such as E′ for MoS2 at 286 cm-1 and A21g for MoS2 at around 463 cm-1 confirm the enhancement of the interlayer coupling.

AB - Stacking of MoS2 and WSe2 monolayers is conducted by transferring triangular MoS2 monolayers on top of WSe2 monolayers, all grown by chemical vapor deposition (CVD). Raman spectroscopy and photoluminescence (PL) studies reveal that these mechanically stacked monolayers are not closely coupled, but after a thermal treatment at 300 °C, it is possible to produce van der Waals solids consisting of two interacting transition metal dichalcogenide (TMD) monolayers. The layer-number sensitive Raman out-of-plane mode A21g for WSe2 (309 cm-1) is found sensitive to the coupling between two TMD monolayers. The presence of interlayer excitonic emissions and the changes in other intrinsic Raman modes such as E′ for MoS2 at 286 cm-1 and A21g for MoS2 at around 463 cm-1 confirm the enhancement of the interlayer coupling.

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Spectroscopic signatures for interlayer coupling in MoS₂-WSe₂ van der waals stacking

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