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Exciton dynamics in tungsten dichalcogenide monolayers

Abstract

Strong photoluminescence from monolayer WS2 and WSe2 pave the way for a range of optoelectronic applications and opens up the door for ultrafast carrier dynamics study. In this work, we observe that monolayer WS2 and WSe2 exhibit giant absorption ability in visible frequency range. This phenomenon has been ascribed to the band nesting effect. We use time-resolved photoluminescence spectroscopy to study the absorption and recombination dynamics of the photocarriers in monolayer WS2 and WSe2. We find that part of the electron-hole pairs excited in the band nesting region initially relaxes to K/K point and then followed by a radiative decay. The decay and recombination of the photocarriers are rapidly occurred and terminate within sub nanosecond timescale. The observed experimental results indicate great potential of these materials in optoelectronics devices.

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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, Accepted Manuscript
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    Exciton dynamics in tungsten dichalcogenide monolayers

    H. Liu and J. Lu, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP02510F

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