Issue 27, 2019

Restoring the intrinsic optical properties of CVD-grown MoS2 monolayers and their heterostructures

Abstract

This study investigated the intrinsic optical properties of MoS2 monolayers and MoS2/WS2 van der Waals (vdW) heterostructures, grown using chemical vapor deposition. To understand the effect of the growth substrate, samples grown on a SiO2/Si surface were transferred and suspended onto a porous substrate. This transfer resulted in a blue shift of the excitonic photoluminescence (PL) peak generated by MoS2 monolayers, together with an intensity increase. The blue shift and the intensity increase are attributed to the release of lattice strain and the elimination of substrate-induced non-radiative relaxation, respectively. This suspension technique also allowed the observation of PL resulting from interlayer excitons in the MoS2/WS2 vdW heterostructures. These results indicate that the suppression of lattice strain and non-radiative relaxation is essential for the formation of interlayer excitons, which in turn is crucial for understanding the intrinsic physical properties of vdW heterostructures.

Graphical abstract: Restoring the intrinsic optical properties of CVD-grown MoS2 monolayers and their heterostructures

Article information

Article type
Paper
Submitted
18 Feb 2019
Accepted
09 May 2019
First published
07 Jun 2019
This article is Open Access
Creative Commons BY license

Nanoscale, 2019,11, 12798-12803

Restoring the intrinsic optical properties of CVD-grown MoS2 monolayers and their heterostructures

K. Kojima, H. E. Lim, Z. Liu, W. Zhang, T. Saito, Y. Nakanishi, T. Endo, Y. Kobayashi, K. Watanabe, T. Taniguchi, K. Matsuda, Y. Maniwa, Y. Miyauchi and Y. Miyata, Nanoscale, 2019, 11, 12798 DOI: 10.1039/C9NR01481K

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