Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.19: Poster

Wednesday, March 20, 2024, 18:00–20:30, Poster E

Photoluminescence emission of TMDC Monolayers under strain — •Pabin Rai, Robert Schmidt, Steffen Michaelis de Vasconcellos, and Rudolf Bratschitsch — Institute of Physics, University of Münster, Wilhelm-klemm-straße 10 48149 Münster Germany

Monolayers of transition metal dichalcogenides (TMDC) emit considerable photoluminescence despite their atomic thickness. The band gap of monolayers decreases when subjected to unidirectional mechanical tensile strain, resulting in a redshift in photoluminescence. Typically, uniaxial tensile strain is applied by bending a flexible polymer with a TMDC monolayer on top. However, this method causes strong sample displacement in the focusing direction, requires realignment after every strain step, and prevents the usage of high-numerical-aperture objective lenses. Here we demonstrate strain application by linearly pulling the flexible polymer substrate to circumvent these issues. These findings bear significance in advancing the development of strain-tuned optoelectronic devices.

Keywords: 2D; TMDC; Strain; Monolayer; Photoluminescence