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Issue 27, 2017
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Exciton dynamics in tungsten dichalcogenide monolayers

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The strong photoluminescence from monolayer WS2 and WSe2 paves the way for a range of optoelectronic applications and opens up the door for ultrafast carrier dynamics study. In this work, we observed that monolayer WS2 and WSe2 exhibited giant absorption in the visible frequency range. This phenomenon has been ascribed to the band nesting effect. We used time-resolved photoluminescence spectroscopy to study the absorption and recombination dynamics of the photocarriers in monolayer WS2 and WSe2. We found that some of the electron–hole pairs excited in the band nesting region initially relaxed to the K/K′ point and then underwent radiative decay. The decay and recombination of the photocarriers occurred rapidly and terminated within the sub-nanosecond timescale. The observed experimental results indicate the great potential of these materials in optoelectronic devices.

Graphical abstract: Exciton dynamics in tungsten dichalcogenide monolayers

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Publication details

The article was received on 18 Apr 2017, accepted on 16 Jun 2017 and first published on 19 Jun 2017

Article type: Paper
DOI: 10.1039/C7CP02510F
Citation: Phys. Chem. Chem. Phys., 2017,19, 17877-17882
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    Exciton dynamics in tungsten dichalcogenide monolayers

    H. Liu and J. Lu, Phys. Chem. Chem. Phys., 2017, 19, 17877
    DOI: 10.1039/C7CP02510F

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