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Understanding Interlayer Coupling in TMD-hBN Heterostructure by Raman Spectroscopy
Name
ding2018understanding.pdf
Description
Accepted version
Size
3.4 MB
Format
Adobe PDF
Checksum (MD5)
e8b48258b54aff14b42561251b052122
Author(s)
Ding, Li
Ukhtary, Muhammad Shoufie
Chubarov, Mikhail
Choudhury, Tanushree H
Zhang, Fu
Yang, Rui
Zhang, Ao
Fan, Jonathan A
Terrones, Mauricio
Redwing, Joan M
Date Issued
2018
Journal
IEEE Transactions on Electron Devices
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Version
Author's final manuscript
Abstract
© 2018 IEEE. In 2-D van der Waals heterostructures, interactions between atomic layers dramatically change the vibrational properties of the hybrid system and demonstrate several interesting phenomena that are absent in individual materials. In this paper, we have investigated the vibrational properties of the heterostructure between transition metal dichalcogenide (TMD) and hexagonal boron nitride (hBN) on gold film at low- and high-frequency ranges by Raman spectroscopy. Nineteen Raman modes have been observed from the sample, including a new interlayer coupling mode at 28.8 cm-1. Compared to reported experimental results of tungsten disulfide (WS2) on SiO2/Si substrates, the Raman spectrum for WS2 on hBN/Au emerges a blue shift of about 8 cm-1. Furthermore, a remarkable enhancement of Raman intensity can be obtained when tuning hBN thickness in the heterostructure. Through systematic first-principles calculations, numerical simulations, and analytical calculations, we find that the 28.8 cm-1 mode originates from the shearing motion between monolayer TMD and hBN layers. In addition, the gold substrate and hBN layers form an optical cavity and the cavity interference effects enhance the obtained Raman intensity. This paper demonstrates the novel vibrational modes of 2-D van der Waals heterostructure as an effective tool to characterize a variety of such heterostructures and reveals a new method to enhance the Raman response of 2-D materials.
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DOI of Published Version
10.1109/TED.2018.2847230
