Observation of Excitonic Rydberg States in Monolayer MoS2 and WS2 by Photoluminescence Excitation Spectroscopy

Observation of Excitonic Rydberg States in Monolayer MoS2 and WS2 by Photoluminescence Excitation Spectroscopy

We have identified excited exciton states in monolayers of MoS2 and WS2 supported on fused silica by means of photoluminescence excitation spectroscopy. In monolayer WS2, the positions of the excited A exciton states imply an exciton binding energy of 0.32 eV. In monolayer MoS2, excited exciton tran...

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Veröffentlicht in:Nano letters 2015-05, Vol.15 (5), p.2992-2997
Hauptverfasser: Hill, Heather M, Rigosi, Albert F, Roquelet, Cyrielle, Chernikov, Alexey, Berkelbach, Timothy C, Reichman, David R, Hybertsen, Mark S, Brus, Louis E, Heinz, Tony F
Format: Artikel
Sprache:eng
Schlagworte:
2D materials
binding energy
Disulfides - chemistry
energy
excitons
Luminescence
MATERIALS SCIENCE
Molybdenum - chemistry
molybdenum disulfide
monolayers
Nanotechnology
phase transitions
Semiconductors
Spectrum Analysis
transition metal dichalcogenides
Tungsten Compounds - chemistry
tungsten disulfide
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Zusammenfassung:We have identified excited exciton states in monolayers of MoS2 and WS2 supported on fused silica by means of photoluminescence excitation spectroscopy. In monolayer WS2, the positions of the excited A exciton states imply an exciton binding energy of 0.32 eV. In monolayer MoS2, excited exciton transitions are observed at energies of 2.24 and 2.34 eV. Assigning these states to the B exciton Rydberg series yields an exciton binding energy of 0.44 eV.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl504868p