Spectroscopic Signatures for Interlayer Coupling in MoS2–WSe2 van der Waals Stacking | Zendy

MingHui Chiu | Zendy; Mingyang Li | Zendy; Wengjing Zhang | Zendy; WeiTing Hsu | Zendy; WenHao Chang | Zendy; Mauricio Terrones | Zendy; Humberto Terrones | Zendy; LainJong Li | Zendy

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Spectroscopic Signatures for Interlayer Coupling in MoS₂–WSe₂ van der Waals Stacking

Author(s) -

MingHui Chiu,

Mingyang Li,

Wengjing Zhang,

WeiTing Hsu,

WenHao Chang,

Mauricio Terrones,

Humberto Terrones,

LainJong Li

Publication year - 2014

Publication title -

acs nano

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.554

H-Index - 382

eISSN - 1936-086X

pISSN - 1936-0851

DOI - 10.1021/nn504229z

Subject(s) - monolayer , stacking , van der waals force , raman spectroscopy , materials science , chemical vapor deposition , photoluminescence , molybdenum disulfide , transition metal , coupling (piping) , crystallography , nanotechnology , chemistry , molecule , optoelectronics , optics , physics , organic chemistry , metallurgy , catalysis

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 A(2)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 A(2)1g for MoS2 at around 463 cm(-1) confirm the enhancement of the interlayer coupling.

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