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

被引：37

作者：

Kojima, Kana ^{[1
]}

Lim, Hong En ^{[1
]}

Liu, Zheng ^{[2
]}

Zhang, Wenjin ^{[3
]}

Saito, Tetsuki ^{[1
]}

Nakanishi, Yusuke ^{[1
]}

Endo, Takahiko ^{[1
]}

Kobayashi, Yu ^{[1
]}

Watanabe, Kenji ^{[4
]}

Taniguchi, Takashi ^{[4
]}

Matsuda, Kazunari ^{[3
]}

Maniwa, Yutaka ^{[1
]}

Miyauchi, Yuhei ^{[3
]}

Miyata, Yasumitsu ^{[1
]}

机构：

[1] Tokyo Metropolitan Univ, Dept Phys, Hachioji, Tokyo 1920397, Japan

[2] AIST, Inorgan Funct Mat Res Inst, Nagoya, Aichi 4638560, Japan

[3] Kyoto Univ, Inst Adv Energy, Uji, Kyoto 6110011, Japan

[4] Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

来源：

NANOSCALE | 2019年 / 11卷 / 27期

关键词：

EXCITON DYNAMICS; MONO LAYER; TRIONS; WS2; OPTOELECTRONICS;

D O I：

10.1039/c9nr01481k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 nonradiative relaxation is essential for the formation of interlayer excitons, which in turn is crucial for understanding the intrinsic physical properties of vdW heterostructures.

引用

页码：12798 / 12803

页数：6

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