Ultrafast Charge Separation in Bilayer WS2/Graphene Heterostructure Revealed by Time- and Angle-Resolved Photoemission Spectroscopy
| Autor: | Krause R., Chavez-Cervantes M., Aeschlimann S., Forti S., Fabbri F., Rossi A., Coletti C., Cacho C., Zhang Y., Majchrzak P.E., Chapman R.T., Springate E., Gierz I. |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
tr-ARPES
TMD graphene van der Waals heterostructures tr-ARPES ultrafast charge transfer photovoltaics Materials Science (miscellaneous) ddc:530 graphene TMD Biophysics General Physics and Astronomy Physics::Optics 530 Physik ultrafast charge transfer photovoltaics Physics::Atomic and Molecular Clusters van der Waals heterostructures Physics::Chemical Physics Physical and Theoretical Chemistry graphene: van der Waals heterostructures Mathematical Physics |
| Zdroj: | Krause, R, Chávez-Cervantes, M, Aeschlimann, S, Forti, S, Fabbri, F, Rossi, A, Coletti, C, Cacho, C, Zhang, Y, Majchrzak, P E, Chapman, R T, Springate, E & Gierz, I 2021, ' Ultrafast Charge Separation in Bilayer WS 2 /Graphene Heterostructure Revealed by Time-and Angle-Resolved Photoemission Spectroscopy ', Frontiers in Physics, vol. 9, 668149 . https://doi.org/10.3389/fphy.2021.668149 Frontiers in Physics Frontiers in Physics 9 (2021): 668149-1–668149-7. doi:10.3389/fphy.2021.668149 info:cnr-pdr/source/autori:Krause R.; Chavez-Cervantes M.; Aeschlimann S.; Forti S.; Fabbri F.; Rossi A.; Coletti C.; Cacho C.; Zhang Y.; Majchrzak P.E.; Chapman R.T.; Springate E.; Gierz I./titolo:Ultrafast Charge Separation in Bilayer WS2%2FGraphene Heterostructure Revealed by Time-and Angle-Resolved Photoemission Spectroscopy/doi:10.3389%2Ffphy.2021.668149/rivista:Frontiers in Physics/anno:2021/pagina_da:668149-1/pagina_a:668149-7/intervallo_pagine:668149-1–668149-7/volume:9 |
| DOI: | 10.3389/fphy.2021.668149 |
| Popis: | 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. © Copyright © 2021 Krause, Chávez-Cervantes, Aeschlimann, Forti, Fabbri, Rossi, Coletti, Cacho, Zhang, Majchrzak, Chapman, Springate and Gierz |
| Databáze: | OpenAIRE |
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