Strong Substrate Strain Effects in Multilayered WS₂ Revealed by High-Pressure Optical Measurements.

ABSTRACT: The optical properties of two-dimensional materials can be effectively tuned by strain induced from a deformable substrate. In the present work we combine first-principles calculations based on density functional theory and the effective Bethe-Salpeter equation with high-pressure optical measurements to thoroughly describe the effect of strain and dielectric environment onto the electronic band structure and optical properties of a few-layered transition-metal dichalcogenide. Our results show that WS₂ remains fully adhered to the substrate at least up to a -0.6% in-plane compressive strain for a wide range of substrate materials. We provide a useful model to describe effect of strain on the optical gap energy. The corresponding experimentally determined out-of-plane and in-plane

SUBMITTER: Oliva R 

PROVIDER: S-EPMC9073841 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature