Dissociation of two-dimensional excitons in monolayer WSe2

Mathieu Massicotte, Fabien Vialla, Peter Schmidt, Mark B. Lundeberg, Simone Latini, Sten Haastrup, Mark Danovich, Diana Davydovskaya, Kenji Watanabe, Takashi Taniguchi, Vladimir I. Fal’ko, Kristian S. Thygesen, Thomas G. Pedersen and Frank H. L. Koppens ()
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Mathieu Massicotte: The Barcelona Institute of Science and Technology
Fabien Vialla: The Barcelona Institute of Science and Technology
Peter Schmidt: The Barcelona Institute of Science and Technology
Mark B. Lundeberg: The Barcelona Institute of Science and Technology
Simone Latini: Technical University of Denmark
Sten Haastrup: Technical University of Denmark
Mark Danovich: University of Manchester
Diana Davydovskaya: The Barcelona Institute of Science and Technology
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Vladimir I. Fal’ko: Technical University of Denmark
Kristian S. Thygesen: Technical University of Denmark
Thomas G. Pedersen: Aalborg University
Frank H. L. Koppens: The Barcelona Institute of Science and Technology

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Two-dimensional (2D) semiconducting materials are promising building blocks for optoelectronic applications, many of which require efficient dissociation of excitons into free electrons and holes. However, the strongly bound excitons arising from the enhanced Coulomb interaction in these monolayers suppresses the creation of free carriers. Here, we identify the main exciton dissociation mechanism through time and spectrally resolved photocurrent measurements in a monolayer WSe2 p–n junction. We find that under static in-plane electric field, excitons dissociate at a rate corresponding to the one predicted for tunnel ionization of 2D Wannier–Mott excitons. This study is essential for understanding the photoresponse of 2D semiconductors and offers design rules for the realization of efficient photodetectors, valley dependent optoelectronics, and novel quantum coherent phases.

Date: 2018
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DOI: 10.1038/s41467-018-03864-y

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