Broadband optical properties of monolayer and bulk MoS2
Journal article, 2020
Layered semiconductors such as transition metal dichalcogenides (TMDs) offer endless possibilities for designing modern photonic and optoelectronic components. However, their optical engineering is still a challenging task owing to multiple obstacles, including the absence of a rapid, contactless, and the reliable method to obtain their dielectric function as well as to evaluate in situ the changes in optical constants and exciton binding energies. Here, we present an advanced approach based on ellipsometry measurements for retrieval of dielectric functions and the excitonic properties of both monolayer and bulk TMDs. Using this method, we conduct a detailed study of monolayer MoS2 and its bulk crystal in the broad spectral range (290–3300 nm). In the near- and mid-infrared ranges, both configurations appear to have no optical absorption and possess an extremely high dielectric permittivity making them favorable for lossless subwavelength photonics. In addition, the proposed approach opens a possibility to observe a previously unreported peak in the dielectric function of monolayer MoS2 induced by the use of perylene-3,4,9,10-tetracarboxylic acid tetrapotassium salt (PTAS) seeding promoters for MoS2 synthesis and thus enables its applications in chemical and biological sensing. Therefore, this technique as a whole offers a state-of-the-art metrological tool for next-generation TMD-based devices.
Author
Georgy A. Ermolaev
Moscow Institute of Physics and Technology
Skolkovo Institute of Science and Technology
Yury V. Stebunov
Moscow Institute of Physics and Technology
Skolkovo Innovation Center
Andrey A. Vyshnevyy
Moscow Institute of Physics and Technology
Dmitry E. Tatarkin
Moscow Institute of Physics and Technology
Dmitry I. Yakubovsky
Moscow Institute of Physics and Technology
Sergey M. Novikov
Moscow Institute of Physics and Technology
Denis Baranov
Chalmers, Physics, Nano and Biophysics
Timur Shegai
Chalmers, Physics, Nano and Biophysics
Alexey Y. Nikitin
Donostia International Physics Center
Basque Foundation for Science (Ikerbasque)
Moscow Institute of Physics and Technology
Aleksey V. Arsenin
Moscow Institute of Physics and Technology
Skolkovo Innovation Center
Valentyn S. Volkov
Moscow Institute of Physics and Technology
Skolkovo Innovation Center
npj 2D Materials and Applications
23977132 (eISSN)
Vol. 4 1 21Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1038/s41699-020-0155-x