Local laser heating effects in monolayer WS2 probed by photoluminescence

Journal Article (Journal Article)

In this article, we report the local heating effects induced by laser irradiation in mechanically exfoliated WS2 monolayers and the characterization of the resulting inhomogeneous temperature field with the technique of photoluminescence spectroscopy. By comparatively measuring the PL spectra of the monolayer WS2 in different contact conditions as well as in air and vacuum, we confirm the existence of remarkable heating in the monolayer due to laser irradiation. In particular, it is found that a specific excitonic emission peak could be used to characterize the inhomogeneous Gaussian-like thermal field and the heat transfer behaviors. Based on the dependence of the excitonic emission energy on temperature, the local temperature induced by laser irradiation may be obtained, i.e., a local temperature up to 213 °C was found at the central region of the irradiated area in vacuum for the excitation power of 450 μW. Such optical method may be applied to the measurement of local heating effects in 2D semiconductors and relevant van der Waals devices.

Full Text

Duke Authors

Cited Authors

  • Peng, Q; Zheng, CC; Chen, X; Wang, RX; Xu, SJ; Ge, XT; Ding, D; Gong, ZM; Ning, JQ; Zhang, RY

Published Date

  • October 1, 2021

Published In

Volume / Issue

  • 562 /

International Standard Serial Number (ISSN)

  • 0169-4332

Digital Object Identifier (DOI)

  • 10.1016/j.apsusc.2021.150226

Citation Source

  • Scopus