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Emission Control from Transition Metal Dichalcogenide Monolayers by Aggregation-Induced Molecular Rotors

  • Mike Tebyetekerwa*
    Mike Tebyetekerwa
    Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
    *Email: [email protected]
  • Yanhua Cheng
    Yanhua Cheng
    State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P.R. China
    More by Yanhua Cheng
  • Jian Zhang
    Jian Zhang
    Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
    More by Jian Zhang
  • Weili Li
    Weili Li
    School of Material Science and Engineering & National Demonstration Center for Experimental Materials Science and Engineering Education, Jiangsu University of Science and Technology, Zhenjiang 212003, P.R. China
    More by Weili Li
  • Hongkun Li
    Hongkun Li
    State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China
    More by Hongkun Li
  • Guru Prakash Neupane
    Guru Prakash Neupane
    Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
  • Bowen Wang
    Bowen Wang
    Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
    More by Bowen Wang
  • Thien N. Truong
    Thien N. Truong
    Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
  • Chuanxiao Xiao
    Chuanxiao Xiao
    National Renewable Energy Laboratory, Golden, Colorado 80401, United States
  • Mowafak M. Al-Jassim
    Mowafak M. Al-Jassim
    National Renewable Energy Laboratory, Golden, Colorado 80401, United States
  • Zongyou Yin
    Zongyou Yin
    Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT 2601, Australia
    More by Zongyou Yin
  • Yuerui Lu
    Yuerui Lu
    Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
    More by Yuerui Lu
  • Daniel Macdonald
    Daniel Macdonald
    Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
  • , and 
  • Hieu T. Nguyen*
    Hieu T. Nguyen
    Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia
    *Email: [email protected]
Cite this: ACS Nano 2020, 14, 6, 7444–7453
Publication Date (Web):May 13, 2020
https://doi.org/10.1021/acsnano.0c03086
Copyright © 2020 American Chemical Society

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    Abstract

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    Organic–inorganic (O–I) heterostructures, consisting of atomically thin inorganic semiconductors and organic molecules, present synergistic and enhanced optoelectronic properties with a high tunability. Here, we develop a class of air-stable vertical O–I heterostructures comprising a monolayer of transition-metal dichalcogenides (TMDs), including WS2, WSe2, and MoSe2, on top of tetraphenylethylene (TPE) core-based aggregation-induced emission (AIE) molecular rotors. The created O–I heterostructures yields a photoluminescence (PL) enhancement of up to ∼950%, ∼500%, and ∼330% in the top monolayer WS2, MoSe2, and WSe2 as compared to PL in their pristine monolayers, respectively. The strong PL enhancement is mainly attributed to the efficient photogenerated carrier process in the AIE luminogens (courtesy of their restricted intermolecular motions in the solid state) and the charge-transfer process in the created type I O–I heterostructures. Moreover, we observe an improvement in photovoltaic properties of the TMDs in the heterostructures including the quasi-Fermi level splitting, minority carrier lifetime, and light absorption. This work presents an inspiring example of combining stable, highly luminescent AIE-based molecules, with rich photochemistry and versatile applications, with atomically thin inorganic semiconductors for multifunctional and efficient optoelectronic devices.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsnano.0c03086.

    • Supplementary Notes 1–6 providing more details of experiments, characterizations and material perfomance; Scheme 1 for the synthetic route of TPE-EP; Figures S1–S17; Tables S1 and S2 (PDF)

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    Cited By

    This article is cited by 23 publications.

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