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Issue 41, 2015
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Probing charge transfer excitons in a MoSe2–WS2 van der Waals heterostructure

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Abstract

We show that the van der Waals heterostructure formed by MoSe2 and WS2 provides a unique system with near degenerate interlayer and intralayer excitonic states. Photoluminescence measurements indicate that the charge transfer exciton states are approximately 50 meV below the MoSe2 exciton states, with a significant spectral overlap. The transient absorption of a femtosecond pulse was used to study the dynamics of the charge transfer excitons at room temperature. We found a lifetime of approximately 80 ps for the charge transfer excitons. A diffusion coefficient of about 14 cm2 s−1 was deduced, which is comparable to individual excitons in transition metal dichalcogenides.

Graphical abstract: Probing charge transfer excitons in a MoSe2–WS2 van der Waals heterostructure

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Publication details

The article was received on 14 Jul 2015, accepted on 20 Sep 2015 and first published on 30 Sep 2015


Article type: Paper
DOI: 10.1039/C5NR04723D
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2015,7, 17523-17528
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    Probing charge transfer excitons in a MoSe2–WS2 van der Waals heterostructure

    F. Ceballos, M. Z. Bellus, H. Chiu and H. Zhao, Nanoscale, 2015, 7, 17523
    DOI: 10.1039/C5NR04723D

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