Charge Photogeneration in Few‐Layer MoS₂

Tetiana Borzda; 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

doi:10.1002/adfm.201500709

journal article·2015-06Open access

Charge Photogeneration in Few‐Layer MoS₂

Tetiana Borzda, 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

Advanced Functional Materials· Volume 25· Issue 22

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Source abstract

Abstract

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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Research context

Electronic materials

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Complex Matter Jozef Stefan Institute Jamova 39 1000 Ljubljana Slovenia

Jozef Stefan International Postgraduate School Jamova 39 1000 Ljubljana Slovenia

Institute of Physics Bijenicka 46 10000 Zagreb Croatia

Faculty of Mathematics and Physics University of Ljubljana Jadranska 19 1000 Ljubljana Slovenia

IFN‐CNR, Department of Physics Politecnico di Milano P. Leonardo da Vinci 32 20133 Milan Italy

Department of Physics and Center of Applied Photonics University of Konstanz D‐78457 Konstanz Germany

Center for Nano Science and Technology Italian Institute of Technology Via Pascoli 70/3 20133 Milano Italy

Center of Excellence in Nanoscience and Nanotechnology Jamova 39 1000 Ljubljana Slovenia

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