Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 22, Pages 3351-3358Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201500709
Keywords
charge generation; excitons; femtosecond spectroscopy; MoS2; transition metal dichalcogenides
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Funding
- LASERLAB-EUROPE (EC) [284464]
- Zukunftskolleg
- Marie Curie CIG project UltraQuEsT [334463]
- ERC
- Graphene Flagship [CNECT-ICT-604391]
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The 2D semiconductor MoS2 in its mono- and few-layer form is expected to have a significant exciton binding energy of several 100 meV, suggesting excitons as the primary photoexcited species. Nevertheless, even single layers show a strong photovoltaic effect and work as the active material in high sensitivity photodetectors, thus indicating efficient charge carrier photogeneration. Here, modulation spectroscopy in the sub-ps and ms time scales is used to study the photoexcitation dynamics in few-layer MoS2. The results suggest that the primary photoexcitations are excitons that efficiently dissociate into charges with a characteristic time of 700 fs. Based on these findings, simple suggestions for the design of efficient MoS2 photovoltaic and photodetector devices are made.
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