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Two-dimensional (2D) transition metal dichalcogenide (TMDC) monolayers, a class of ultrathin materials with a direct bandgap and high exciton binding energies, provide an ideal platform to study the photoluminescence (PL) of light-emitting devices. Atomically thin TMDCs usually contain various defects, which enrich the lattice structure and give rise to many intriguing properties. As the influences of defects can be either detrimental or beneficial, a comprehensive understanding of the internal mechanisms underlying defect behaviour is required for PL tailoring. Herein, recent advances in the defect influences on PL emission are summarized and discussed. Fundamental mechanisms are the focus of this review, such as radiative/nonradiative recombination kinetics and band structure modification. Both challenges and opportunities are present in the field of defect manipulation, and the exploration of mechanisms is expected to facilitate the applications of 2D TMDCs in the future.

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Publication history

Received: 19 June 2020
Revised: 29 July 2020
Accepted: 04 August 2020
Published: 05 January 2021
Issue date: January 2021

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

This work was supported by the National Key R&D Program of China (Nos. 2017YFA0205700 and 2019YFA0308000), the National Natural Science Foundation of China (NSFC) (Nos. 61774034, 91963130, 11704068, and 61705106), and Jiangsu Natural Science Foundation (No. BK20170694). The project is supported by "the Fundamental Research Funds for the Central Universities" .

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Email: nanores@tup.tsinghua.edu.cn

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