Unraveling the origin of dominant exciton and band structure details in bilayer MoTe2

Zhen Wang; Hao Sun; Jiacheng Tang; Kun Yin; Cun-Zheng Ning

doi:10.1117/12.3005937

24 November 2023 Unraveling the origin of dominant exciton and band structure details in bilayer MoTe₂

Zhen Wang, Hao Sun, Jiacheng Tang, Kun Yin, Cun-Zheng Ning

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129351C (2023) https://doi.org/10.1117/12.3005937
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

Bilayer molybdenum ditelluride (MoTe₂) exhibits promising research potential in silicon-based optoelectronics due to its near-infrared emission band. Although previous studies have shown that the direct and indirect bandgaps are closely located, the origin of the dominant exciton in photoluminescence (PL) emission and the energy difference between the direct and indirect bandgaps remain uncertain. To address these issues, we performed comprehensive micro-PL and absorption measurements on monolayer and bilayer samples, incorporating electrical control, across a wide temperature range of 4 to 300 K. These systematic measurements determined that the dominant PL emission in bilayer MoTe₂ arises from an intralayer exciton with a direct bandgap and the energy difference between the direct and indirect bandgaps in the bubble-strained bilayer sample with a strain of approximately 1% was estimated to be around 10 meV in experiment, consistent with theoretical calculations in the literature.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zhen Wang, Hao Sun, Jiacheng Tang, Kun Yin, and Cun-Zheng Ning "Unraveling the origin of dominant exciton and band structure details in bilayer MoTe₂", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129351C (24 November 2023); https://doi.org/10.1117/12.3005937

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