The Impact of the Substrate Material on the Optical Properties of 2D WSe2 Monolayers

被引：11

作者：

Schneider, L. M. ^{[1
]}

Lippert, S. ^{[1
]}

Kuhnert, J. ^{[1
]}

Renaud, D. ^{[1
]}

Kang, K. N. ^{[2
]}

Ajayi, O. ^{[3
]}

Halbich, M. -U. ^{[1
]}

Abdulmunem, O. M. ^{[1
]}

Lin, X. ^{[1
]}

Hassoon, K. ^{[1
]}

Edalati-Boostan, S. ^{[1
]}

Kim, Y. D. ^{[3
]}

Heimbrodt, W. ^{[1
]}

Yang, E. H. ^{[2
]}

Hone, J. C. ^{[3
]}

Rahimi-Iman, A. ^{[1
]}

机构：

[1] Philipps Univ Marburg, Dept Phys, D-35032 Marburg, Germany

[2] Stevens Inst Technol, Dept Mech Engn, Hoboken, NJ 07030 USA

[3] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

来源：

SEMICONDUCTORS | 2018年 / 52卷 / 05期

关键词：

EXCITON-EXCITON ANNIHILATION; SINGLE-LAYER; WS2; HETEROSTRUCTURES; BIEXCITONS; MOS2;

D O I：

10.1134/S1063782618050275

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

2D-materials, especially transition metal dichalcogenides (TMDs) have drawn a lot of attention due to their remarkable characteristics rendering them a promising candidate for optical applications. While the basic properties are understood up to now, the influence of the environment has not been studied in detail, yet. Here we highlight a systematic comparison of the optical properties of tungsten diselenide monolayers on different substrates. Subtle changes in the emission spectrum and Raman signature have been found as well as surprisingly pronounced differences in the pump-power-dependent and time-resolved output at higher excitation densities. For all samples, exciton-exciton annihilation can be obtained. Nevertheless an analysis of different pump-dependent decay rates suggests substrate-dependent changes in the diffusion constant as well as exciton Bohr radius.

引用

页码：565 / 571

页数：7

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