Journal
NANOSCALE
Volume 9, Issue 20, Pages 6674-6679Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr01598d
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Funding
- JSPS KAKENHI [JP25400324, JP24681031, JP16H00911, JP15K13337, JP15H05408, JP25246010, JP25610074, JP26107522, JP15F15313, JP15K13500, JP16H00910, JP15J07423, JP16K17485, JP16H06331]
- JST CREST [JPMJCR16F3]
- Asahi Glass Foundation
- Murata Science Foundation
- Singapore National Research Foundation, Prime Minister's Office, Singapore under NRF [NRF-NRFF2011-02]
- Grants-in-Aid for Scientific Research [15H05408, 16H00911, 17K19055, 16H00910, 15K13337] Funding Source: KAKEN
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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 similar to 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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