Strain engineering in monolayer WS2, MoS2, and the WS2/MoS2 heterostructure

Xin He, Hai Li, Zhiyong Zhu, Zhenyu Dai, Yang Yang, Peng Yang, Qiang Zhang, Peng Li, Udo Schwingenschlögl, Xixiang Zhang

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85 Scopus citations

Abstract

Mechanically exfoliated monolayers of WS2, MoS2 and their van der Waals heterostructure were fabricated on flexible substrate so that uniaxial tensile strain can be applied to the two-dimensional samples. The modification of the band structure under strain was investigated by micro-photoluminescence spectroscopy at room temperature as well as by first-principles calculations. Exciton and trion emissions were observed in both WS2 and the heterostructure at room temperature, and were redshifted by strain, indicating potential for applications in flexible electronics and optoelectronics.
Original languageEnglish (US)
Pages (from-to)173105
JournalApplied Physics Letters
Volume109
Issue number17
DOIs
StatePublished - Oct 27 2016

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