Spectroscopic Signatures for Interlayer Coupling in MoS2–WSe2 van der Waals Stacking
Source abstract
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 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.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · MXene and MAX Phase Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 11529, Taiwan
Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Shenzhen University, Shenzhen 518060, China
Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan
Department of Physics, Chemistry, Materials Science and Engineering and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, 104 Davey Lab., University Park, Pennsylvania 16802, United States
Departament of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, United States
Funding
Pennsylvania Sea Grant, Pennsylvania State University · Army Research Office · National Science Council Taiwan · King Abdullah University of Science and Technology · Division of Materials Research
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