Charge Photogeneration in Few-Layer MoS2

Publikationstyp: Zeitschriftenartikel
Autor/innen: Borzda, Tetiana; Gadermaier, Christoph; Vujicic, Natasa; Topolovsek, Peter; Borovsak, Milos; Mertelj, Tomaz; Viola, Daniele; Manzoni, Cristian; Pogna, Eva A. A.; Brida, Daniele; Antognazza, Maria Rosa; Scotognella, Francesco; Lanzani, Guglielmo; Cerullo, Giulio; Mihailovic, Dragan
Erscheinungsjahr: 2015
Erschienen in: Advanced Functional Materials ; 25 (2015), 22. - S. 3351-3358. - ISSN 1616-301X. - eISSN 1099-0712
DOI (zitierfähiger Link): https://dx.doi.org/10.1002/adfm.201500709
Zusammenfassung:
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.
Fachgebiet (DDC): 530 Physik
Universitätsbibliographie: Ja

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BORZDA, Tetiana, Christoph GADERMAIER, Natasa VUJICIC, Peter TOPOLOVSEK, Milos BOROVSAK, Tomaz MERTELJ, Daniele VIOLA, Cristian MANZONI, Eva A. A. POGNA, Daniele BRIDA, Maria Rosa ANTOGNAZZA, Francesco SCOTOGNELLA, Guglielmo LANZANI, Giulio CERULLO, Dragan MIHAILOVIC, 2015. Charge Photogeneration in Few-Layer MoS2. In: Advanced Functional Materials. 25(22), pp. 3351-3358. ISSN 1616-301X. eISSN 1099-0712

@article{Borzda2015Charg-31315, title={Charge Photogeneration in Few-Layer MoS2}, year={2015}, doi={10.1002/adfm.201500709}, number={22}, volume={25}, issn={1616-301X}, journal={Advanced Functional Materials}, pages={3351--3358}, author={Borzda, Tetiana and Gadermaier, Christoph and Vujicic, Natasa and Topolovsek, Peter and Borovsak, Milos and Mertelj, Tomaz and Viola, Daniele and Manzoni, Cristian and Pogna, Eva A. A. and Brida, Daniele and Antognazza, Maria Rosa and Scotognella, Francesco and Lanzani, Guglielmo and Cerullo, Giulio and Mihailovic, Dragan} }

Lanzani, Guglielmo Gadermaier, Christoph Borovsak, Milos Mertelj, Tomaz Borovsak, Milos Borzda, Tetiana Mihailovic, Dragan eng Mertelj, Tomaz Antognazza, Maria Rosa Manzoni, Cristian Manzoni, Cristian Brida, Daniele Cerullo, Giulio Topolovsek, Peter 2015-06-30T11:58:35Z Borzda, Tetiana 2015 Scotognella, Francesco Topolovsek, Peter Antognazza, Maria Rosa Viola, Daniele Pogna, Eva A. A. Vujicic, Natasa Lanzani, Guglielmo Charge Photogeneration in Few-Layer MoS<sub>2</sub> Brida, Daniele Gadermaier, Christoph Scotognella, Francesco Viola, Daniele Cerullo, Giulio Vujicic, Natasa The 2D semiconductor MoS<sub>2</sub> 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 MoS<sub>2</sub>. 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 MoS<sub>2</sub> photovoltaic and photodetector devices are made. Pogna, Eva A. A. 2015-06-30T11:58:35Z Mihailovic, Dragan

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