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Nonblinking, Intense Two-Dimensional Light Emitter: Monolayer WS2 Triangles

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    Nonblinking, Intense Two-Dimensional Light Emitter: Monolayer WS2 Triangles
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    † Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
    § Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
    ⊥ Department of Physics, Faculty of Science, National University of Singapore, Singapore 117542
    ∥ Graphene Research Centre, National University of Singapore, 2 Science Drive 3, Singapore 117542
    *Address correspondence to [email protected]
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    ACS Nano

    Cite this: ACS Nano 2013, 7, 12, 10985–10994
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    https://doi.org/10.1021/nn4046002
    Published November 22, 2013
    Copyright © 2013 American Chemical Society
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    Abstract

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    Monolayer WS2 (1L-WS2), with a direct band gap, provides an ideal platform to investigate unique properties of two-dimensional semiconductors. In this work, light emission of a 1L-WS2 triangle has been studied by using steady-state, time-resolved, and temperature-dependent photoluminescence (PL) spectroscopy. Two groups of 1L-WS2 triangles have been grown by chemical vapor deposition, which exhibit nonuniform and uniform PL, respectively. Observed nonuniform PL features, i.e., quenching and blue-shift in certain areas, are caused by structural imperfection and n-doping induced by charged defects. Uniform PL is found to be intrinsic, intense, and nonblinking, which are attributed to high crystalline quality. The binding energy of the A-exciton is extracted experimentally, which gives direct evidence for the large excitonic effect in 1L-WS2. These superior photon emission features make 1L-WS2 an appealing material for optoelectronic applications such as novel light-emitting and biosensing devices.

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    Supporting Information

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    Optical and AFM images of as-grown WS2 samples; Raman spectra of mono-, bi-, and trilayer and bulk WS2; comparison of PL positions and widths as a function of the number of layers from previous reports and the present work; optical spectra of the R6G solution and the R6G film; relative intensities of 1L-WS2 and 1L-MoS2 samples at λex = 457 nm; PL spectra from the edge and center regions of 1L-WS2 triangles from two groups; AFM and Raman mapping images of 1L-WS2 from two groups; PL time-trace data; electrical transport characteristics; optical images and PL spectrum from exfoliated 1L-WS2; schematics of CVD setups; temperature-dependent PL spectra; temperature dependence of PL widths of 1L-WS2 from group B; fit of PL spectra and the fitting parameters. This material is available free of charge via the Internet at http://pubs.acs.org.

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    This article is cited by 284 publications.

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