Charge photogeneration in few-layer MoS2 (CROSBI ID 221014)
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Podaci o odgovornosti
Borzda, Tetiana ; Gadermaier, Christoph ; Vujičić, Nataša ; Topolovšek, Peter ; Borovšak, Miloš ; Mertelj, Tomaž ; Viola, Daniele ; Manzoni, Cristian ; Pogna, Eva A. A. ; Brida, Daniele ; Antagnazza, Maria Rosa ; Scotognella, Francesco ; Lanzani, Guglielmo ; Cerullo, Giulio ; Mihailović, Dragan
engleski
Charge photogeneration in few-layer MoS2
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.
charge generation; excitons; femtosecond spectroscopy; MoS2; transition metal dichalcogenides
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