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Nano Research

Article Title

Strain engineering in single-, bi- and tri-layer MoS2, MoSe2, WS2 and WSe2

Keywords

two-dimensional (2D) materials, transition metal dichalcogenides, strain engineering, band gap, differential reflectance

Abstract

Strain is a powerful tool to modify the optical properties of semiconducting transition metal dichalcogenides like MoS2, MoSe2, WS2 and WSe2. In this work we provide a thorough description of the technical details to perform uniaxial strain measurements on these two-dimensional semiconductors and we provide a straightforward calibration method to determine the amount of applied strain with high accuracy. We then employ reflectance spectroscopy to analyze the strain tunability of the electronic properties of single-, bi- and tri-layer MoS2, MoSe2, WS2 and WSe2. Finally, we quantify the flake-to-flake variability by analyzing 15 different single-layer MoS2 flakes.

Publisher

Tsinghua University Press

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