Thickness-Dependent Differential Reflectance Spectra of Monolayer and Few-Layer MoS₂, MoSe₂, WS₂ and WSe₂

Nanomaterials
Yue NiuAndres Castellanos-Gomez

Abstract

The research field of two dimensional (2D) materials strongly relies on optical microscopy characterization tools to identify atomically thin materials and to determine their number of layers. Moreover, optical microscopy-based techniques opened the door to study the optical properties of these nanomaterials. We presented a comprehensive study of the differential reflectance spectra of 2D semiconducting transition metal dichalcogenides (TMDCs), MoS₂, MoSe₂, WS₂, and WSe₂, with thickness ranging from one layer up to six layers. We analyzed the thickness-dependent energy of the different excitonic features, indicating the change in the band structure of the different TMDC materials with the number of layers. Our work provided a route to employ differential reflectance spectroscopy for determining the number of layers of MoS₂, MoSe₂, WS₂, and WSe₂.

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Citations

Jan 8, 2019·Advanced Materials·Nestor IguiñizAndres Castellanos-Gomez
Dec 19, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yaxu WeiLidong Sun
Jul 3, 2020·Nanomaterials·Sergio PueblaAndres Castellanos-Gomez
Jan 13, 2021·Nanoscale·Yuan ChengGang Zhang
Mar 18, 2021·Optics Express·Xuejun XuBaolai Liang
Apr 14, 2021·Nanotechnology·Pratik M PataniyaC K Sumesh
Jun 3, 2021·Nano Letters·Marie-Christin HeißenbüttelMichael Rohlfing
Sep 8, 2020·ACS Applied Materials & Interfaces·Soyeong KwonDong-Wook Kim
Dec 1, 2020·ACS Applied Materials & Interfaces·Zhenghao GuDavid Wei Zhang
Aug 19, 2020·Inorganic Chemistry·Aaron M MillerDavid C Johnson
Dec 4, 2019·The Journal of Physical Chemistry Letters·Jeffrey L BlackburnObadiah George Reid
Sep 4, 2021·Advanced Materials·Leonhard KargerClaudia Backes
Sep 30, 2021·Nanoscale·Jeong-Seon YuJong-Hyun Kim
Oct 3, 2021·Advanced Materials·Hao LiAndres Castellanos-Gomez
Nov 1, 2020·Journal of Colloid and Interface Science·Pratik M PataniyaC K Sumesh

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Methods Mentioned

BETA
optical microscopy

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