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Thermal dissociation of inter-layer excitons in MoS2/MoSe2 hetero-bilayers
Shinichiro Mouri1, Wenjin Zhang, Daichi Kozawa
1Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan. iguchan@fc.ritsumei.ac.jp matsuda@iae.kyoto-u.ac.jp.
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.
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