Naslov
Charge photogeneration in few-layer MoS2

Autori
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

Izvornik
Advanced functional materials (1616-301X) 25 (2015); 3351-3358

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
charge generation; excitons; femtosecond spectroscopy; MoS2; transition metal dichalcogenides

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA