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  Ultrafast Charge Separation in Bilayer WS2/Graphene Heterostructure Revealed by Time- and Angle-Resolved Photoemission Spectroscopy

Krause, R., Chavez Cervantes, M., Aeschlimann, S., Forti, S., Fabbri, F., Rossi, A., et al. (2021). Ultrafast Charge Separation in Bilayer WS2/Graphene Heterostructure Revealed by Time- and Angle-Resolved Photoemission Spectroscopy. Frontiers in Physics, 9: 668149. doi:10.3389/fphy.2021.668149.

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This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
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2021
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© Krause, Chávez-Cervantes, Aeschlimann, Forti, Fabbri, Rossi, Coletti, Cacho, Zhang, Majchrzak, Chapman, Springate and Gierz.

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https://dx.doi.org/10.3389/fphy.2021.668149 (Publisher version)
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 Creators:
Krause, R.1, 2, 3, Author              
Chavez Cervantes, M.2, 3, Author              
Aeschlimann, S.1, 2, 3, Author              
Forti, S.4, Author
Fabbri, F.4, 5, 6, Author
Rossi, A.4, 5, Author
Coletti, C.4, 6, Author
Cacho, C.7, Author
Zhang, Y.8, Author
Majchrzak, P. E.9, Author
Chapman, R. T.8, Author
Springate, E.8, Author
Gierz, I.1, Author
Affiliations:
1Institute for Experimental and Applied Physics, University of Regensburg, ou_persistent22              
2Ultrafast Electron Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938295              
3Center for Free Electron Laser Science, ou_persistent22              
4Center for Nanotechnology Innovation at IIT@NEST, Istituto Italiano di Tecnologia, ou_persistent22              
5National Enterprise for nanoScience and nanoTechnology (NEST), Istituto Nanoscienze, Consiglio Nazionale delle Ricerche (CNR) and Scuola Normale Superiore, ou_persistent22              
6Graphene Labs, Istituto Italiano di Tecnologia, ou_persistent22              
7Diamond Light Source, Harwell Science and Innovation Campus, ou_persistent22              
8Central Laser Facility, Science and Technology Facilities Council (STFC) Rutherford Appleton Laboratory, ou_persistent22              
9Department of Physics and Astronomy, Aarhus University, ou_persistent22              

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Free keywords: TMD, graphene, van der Waals heterostructures, tr-ARPES, ultrafast charge transfer, photovoltaics
 Abstract: Efficient light harvesting devices need to combine strong absorption in the visible spectral range with efficient ultrafast charge separation. These features commonly occur in novel ultimately thin van der Waals heterostructures with type II band alignment. Recently, ultrafast charge separation was also observed in monolayer WS2/graphene heterostructures with type I band alignment. Here we use time- and angle-resolved photoemission spectroscopy to show that ultrafast charge separation also occurs at the interface between bilayer WS2 and graphene indicating that the indirect band gap of bilayer WS2 does not affect the charge transfer to the graphene layer. The microscopic insights gained in the present study will turn out to be useful for the design of novel optoelectronic devices.

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Language(s): eng - English
 Dates: 2021-02-152021-03-232021-04-29
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3389/fphy.2021.668149
 Degree: -

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Project name : -
Grant ID : 654148
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Frontiers in Physics
Source Genre: Journal
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Publ. Info: Lausanne : Frontiers Media
Pages: - Volume / Issue: 9 Sequence Number: 668149 Start / End Page: - Identifier: ISSN: 2296-424X
CoNE: https://pure.mpg.de/cone/journals/resource/2296-424X