Charge Photogeneration in Few-Layer MoS2

Type of Publication: Journal article
Author: 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
Year of publication: 2015
Published in: Advanced Functional Materials ; 25 (2015), 22. - pp. 3351-3358. - ISSN 1616-301X. - eISSN 1099-0712
DOI (citable link): https://dx.doi.org/10.1002/adfm.201500709
Summary:
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.
Subject (DDC): 530 Physics
Bibliography of Konstanz: Yes

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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. Available under: doi: 10.1002/adfm.201500709

@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} }

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

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