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Issue 20, 2017
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Thermal dissociation of inter-layer excitons in MoS2/MoSe2 hetero-bilayers

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Abstract

We describe photoluminescence (PL), PL excitation, and time-resolved PL spectroscopy of hetero-bilayers comprising monolayers (1L) of MoS2 and MoSe2 at cryogenic temperatures. A PL peak showing a decay time of 2.5 ns was observed below 100 K, which can be attributed to an inter-layer exciton emission in the 1L-MoS2/1L-MoSe2 hetero-bilayers. An inter-layer exciton binding energy of ∼90 meV is determined from its thermal dissociation behavior; the band offset of each layer obtained from this value is consistent with previously reported first-principles calculations. Moreover, generation of inter-layer charged excitons (trions) is implied from the gate modulation of the inter-layer exciton PL spectra.

Graphical abstract: Thermal dissociation of inter-layer excitons in MoS2/MoSe2 hetero-bilayers

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Publication details

The article was received on 05 Mar 2017, accepted on 18 Apr 2017 and first published on 20 Apr 2017


Article type: Paper
DOI: 10.1039/C7NR01598D
Citation: Nanoscale, 2017,9, 6674-6679
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    Thermal dissociation of inter-layer excitons in MoS2/MoSe2 hetero-bilayers

    S. Mouri, W. Zhang, D. Kozawa, Y. Miyauchi, G. Eda and K. Matsuda, Nanoscale, 2017, 9, 6674
    DOI: 10.1039/C7NR01598D

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