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Open AccessArticle

Interlayer Difference of Bilayer-Stacked MoS2 Structure: Probing by Photoluminescence and Raman Spectroscopy

1
College of Advanced Interdisciplinary Research, National University of Defense Technology, Changsha 410073, China
2
College of Arts and Science, National University of Defense Technology, Changsha 410073, China
3
College of Physical Science and Technology, Xiamen University, Xiamen 361000, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(5), 796; https://doi.org/10.3390/nano9050796
Received: 16 April 2019 / Revised: 6 May 2019 / Accepted: 17 May 2019 / Published: 24 May 2019
(This article belongs to the Special Issue Preparation and Properties of 2D Materials)
This work reports the interlayer difference of exciton and phonon performance between the top and bottom layer of a bilayer-stacked two-dimensional materials structure (BSS). Through photoluminescence (PL) and Raman spectroscopy, we find that, compared to that of the bottom layer, the top layer of BSS demonstrates PL redshift, Raman E 2 g 1 mode redshift, and lower PL intensity. Spatial inhomogeneity of PL and Raman are also observed in the BSS. Based on theoretical analysis, these exotic effects can be attributed to substrate-coupling-induced strain and doping. Our findings provide pertinent insight into film–substrate interaction, and are of great significance to researches on bilayer-stacked structures including twisted bilayer structure, Van der Waals hetero- and homo-structure. View Full-Text
Keywords: film–substrate interaction; photoluminescence; Raman spectroscopy; molybdenum disulfide; bilayer-stacked structure film–substrate interaction; photoluminescence; Raman spectroscopy; molybdenum disulfide; bilayer-stacked structure
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MDPI and ACS Style

Zhang, X.; Zhang, R.; Zheng, X.; Zhang, Y.; Zhang, X.; Deng, C.; Qin, S.; Yang, H. Interlayer Difference of Bilayer-Stacked MoS2 Structure: Probing by Photoluminescence and Raman Spectroscopy. Nanomaterials 2019, 9, 796.

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