Thickness-dependent excitonic properties of atomically thin 2H-MoTe2

doi:10.1088/1674-1056/ab5a3a

Abstract Two-dimensional (2D) 2H-MoTe₂ is a promising semiconductor because of its small bandgap, strong absorption, and low thermal conductivity. In this paper, we systematically study the optical and excitonic properties of atomically thin 2H-MoTe₂ (1-5 layers). Due to the fact that the optical contrast and Raman spectra of 2H-MoTe₂ with different thicknesses exhibit distinctly different behaviors, we establish a quantitative method by using optical images and Raman spectra to directly identify the layers of 2H-MoTe₂ thin films. Besides, excitonic states and binding energy in monolayer/bilayer 2H-MoTe₂ are measured by temperature-dependent photoluminescence (PL) spectroscopy. At temperature T=3.3 K, we can observe an exciton emission at ~1.19 eV and trion emission at ~1.16 eV for monolayer 2H-MoTe₂. While at room temperature, the exciton emission and trion emission both disappear for their small binding energy. We determine the exciton binding energy to be 185 meV (179 meV), trion binding energy to be 20 meV (18 meV) for the monolayer (bilayer) 2H-MoTe₂. The thoroughly studies of the excitonic states in atomically thin 2H-MoTe₂ will provide guidance for future practical applications.

Keywords: 2H-MoTe₂ photoluminescence Raman exciton and trion

Received: 20 October 2019
Revised: 19 November 2019
Accepted manuscript online:

PACS:	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
	78.55.-m	(Photoluminescence, properties and materials)
	74.25.nd	(Raman and optical spectroscopy)

Fund: Project supported by the Natural Science Research Projects in Colleges and Universities of Jiangsu Province, China (Grant No. 18KJD140003).

Corresponding Authors: Zheng-Qing Qi
E-mail: qi.zq@163.com

Cite this article:

Jin-Huan Li(李金焕), Dan Bing(邴单), Zhang-Ting Wu(吴章婷), Guo-Qing Wu(吴国庆), Jing Bai(白静), Ru-Xia Du(杜如霞), Zheng-Qing Qi(祁正青) Thickness-dependent excitonic properties of atomically thin 2H-MoTe₂ 2020 Chin. Phys. B 29 017802

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Thickness-dependent excitonic properties of atomically thin 2H-MoTe2

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Thickness-dependent excitonic properties of atomically thin 2H-MoTe₂