Journal
2D MATERIALS
Volume 6, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aae9b9
Keywords
ReS2; excitons; DFT; photoluminescence
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Funding
- BLAPHENE project from the IDEX Toulouse, Emergence program, 'Programme des Investissements d'Avenir' [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]
- STRABOT project from the IDEX Toulouse, Emergence program, 'Programme des Investissements d'Avenir' [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]
- PAN-CNRS collaboration within the PICS 2016-2018
- Polish Ministry of Science and Higher Education within the Mobilnosc Plus program [1648/MOB/V/2017/0]
- Deutsche Forschungsgemeinschaft via the FlagERA project [HE 3543/27-1]
- ZIH Dresden
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We present a systematic investigation of the electronic properties of bulk and few layer ReS2 van der Waals crystals using low temperature optical spectroscopy. Weak photoluminescence emission is observed from two non-degenerate band edge excitonic transitions separated by similar to 20 meV. The comparable emission intensity of both excitonic transitions is incompatible with a fully thermalized (Boltzmann) distribution of excitons, indicating the hot nature of the emission. While DFT calculations predict bilayer ReS2 to have a direct fundamental band gap, our optical data suggests that the fundamental gap is indirect in all cases.
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