Optically Active Telecom Defects in MoTe2 Fewlayers at Room Temperature

Yuxin Lei; Qiaoling Lin; Sanshui Xiao; Juntao Li; Hanlin Fang

doi:10.3390/nano13091501

Optically Active Telecom Defects in MoTe₂ Fewlayers at Room Temperature

Nanomaterials (Basel). 2023 Apr 27;13(9):1501. doi: 10.3390/nano13091501.

Authors

Yuxin Lei¹, Qiaoling Lin^{2

3}, Sanshui Xiao^{2

3}, Juntao Li¹, Hanlin Fang⁴

Affiliations

¹ State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.
² Department of Electrical and Photonics Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
³ NanoPhoton-Center for Nanophotonics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
⁴ Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, 41296 Gothenburg, Sweden.

Abstract

The optical and electrical properties of semiconductors are strongly affected by defect states. The defects in molybdenum ditelluride (MoTe2) show the potential for quantum light emission at optical fiber communication bands. However, the observation of defect-related light emission is still limited to cryogenic temperatures. In this work, we demonstrate the deep defect states in MoTe2 fewlayers produced via a standard van der Waal material transfer method with a heating process, which enables light emission in the telecommunication O-band. The optical measurements show evidence of localized excitons and strong interaction among defects. Furthermore, the optical emission of defects depends on the thickness of the host materials. Our findings offer a new route for tailoring the optical properties of two-dimensional materials in optoelectronic applications.

Keywords: MoTe2; defect; optical fiber communication.

Grants and funding

This work was funded by the Olle Engkvists stiftelse; the Carl Tryggers stiftelse; the Chalmers Excellence Initiative Nano; the National Natural Science Foundation of China (project no. 11974436); the Independent Research Fund Denmark (project no. 9041-00333B, 2032-00351B); the Danish National Research Foundation (project DNRF147).