Optical characterization of 2D MoSe2 and WSe2 monolayer semiconductors

Jessica Patel; Manuel A Quijada; Luis Rodriquez de Marcos; Ruihao Ni; You Zhou

doi:10.1117/12.2677096

19 July 2023 Optical characterization of 2D MoS₂ and WSe₂ monolayer semiconductors

Jessica Patel, Manuel A Quijada, Luis Rodriquez de Marcos, Ruihao Ni, You Zhou

Proceedings Volume 12633, Photonics for Quantum 2023; 126330K (2023) https://doi.org/10.1117/12.2677096
Event: Photonics for Quantum, 2023, Rochester, New York, United States

Conference Poster

Abstract

We investigate the optical properties of two-dimensional monolayer films of MoSe₂ and WSe₂ (each 0.7nm thick) assembled on SiO₂/Si substrates (285nm/0.5mm thick). These films are interesting because they are direct band gap semiconductors that have large excitonic responses. However, due to numerous challenges, including the lack of a quick, contactless, and reliable method, obtaining the optical constants and exciton binding energies in-situ remains a difficult endeavor. Here, we report the optical properties based on contactless ellipsometry to retrieve the optical constants (n,k) and excitonic properties of both monolayers (MoSe₂ and WSe₂). The optical properties of these materials away from the exciton (~700 nm) are generally not well understood. In this work, we will explore the optical response of these films over a broad range that includes the UV/visible and near infrared (200-2000nm) in order to understand if there are other spectral regions with a strong or tunable refractive index. The current samples are intrinsic without doping. The SiO₂ on the Si substrate would be used as a gate capacitor which would allow to vary the density by ~10¹¹-10¹² cm^-2. These transition metal dichalcogenides (TMD) offer new possibilities for designing modern photonic and optoelectronic components.

Citation Download Citation

Jessica Patel, Manuel A Quijada, Luis Rodriquez de Marcos, Ruihao Ni, and You Zhou "Optical characterization of 2D MoS₂ and WSe₂ monolayer semiconductors", Proc. SPIE 12633, Photonics for Quantum 2023, 126330K (19 July 2023); https://doi.org/10.1117/12.2677096

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