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Proceedings Paper

Biaxial strain in atomically thin transition metal dichalcogenides
Author(s): Riccardo Frisenda; Robert Schmidt; Steffen Michaelis de Vasconcellos; Rudolf Bratschitsch; David Perez de Lara; Andres Castellanos-Gomez
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Paper Abstract

Strain engineering in single-layer semiconducting transition metal dichalcogenides aims to tune their bandgap energy and to modify their optoelectronic properties by the application of external strain. In this paper we study transition metal dichalcogenides monolayers deposited on polymeric substrates under the application of biaxial strain, both tensile and compressive. We can control the amount of biaxial strain applied by letting the substrate thermally expand or compress by changing the substrate temperature. After modelling the substrate-dependent strain transfer process with a finite elements simulation, we performed micro-differential spectroscopy of four transition metal dichalcogenides monolayers (MoS2, MoSe2, WS2, WSe2) under the application of biaxial strain and measured their optical properties. For tensile strain we observe a redshift of the bandgap that reaches a value as large as 94 meV/% in the case of single-layer WS2 deposited on polypropylene. The observed bandgap shifts as a function of substrate extension/ compression follow the order WS2 < WSe2 < MoS2 < MoSe2.

Paper Details

Date Published: 29 August 2017
PDF: 12 pages
Proc. SPIE 10353, Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017, 103530N (29 August 2017); doi: 10.1117/12.2274756
Show Author Affiliations
Riccardo Frisenda, IMDEA Nanociencia (Spain)
Robert Schmidt, Univ. of Münster (Germany)
Steffen Michaelis de Vasconcellos, Univ. of Münster (Germany)
Rudolf Bratschitsch, Univ. of Münster (Germany)
David Perez de Lara, IMDEA Nanociencia (Spain)
Andres Castellanos-Gomez, Instituto de Ciencia de Materiales de Madrid (Spain)

Published in SPIE Proceedings Vol. 10353:
Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017
Manijeh Razeghi; Oleg Mitrofanov; José Luis Pau Vizcaíno; Chee Hing Tan, Editor(s)

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