Article Hybrid Frenkel–Wannier excitons facilitate ultrafast energy transfer at a 2D–organic interface

Wiebke Bennecke ; Ignacio Gonzalez Oliva ; Jan Philipp Bange ; Paul Werner ; David Schmitt ; Marco Merboldt ; Anna M. Seiler ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Daniel Steil ; R. Thomas Weitz ; Peter Puschnig ; Claudia Draxl ; G. S. Matthijs Jansen ; Marcel Reutzel ; Stefan Mathias

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Wiebke Bennecke, Ignacio Gonzalez Oliva, Jan Philipp Bange, Paul Werner, David Schmitt, Marco Merboldt, Anna M. Seiler, Kenji Watanabe, Takashi Taniguchi, Daniel Steil, R. Thomas Weitz, Peter Puschnig, Claudia Draxl, G. S. Matthijs Jansen, Marcel Reutzel, Stefan Mathias. Hybrid Frenkel–Wannier excitons facilitate ultrafast energy transfer at a 2D–organic interface. Nature Physics. 2025, 21 (12), 1973-1980. https://doi.org/10.1038/s41567-025-03075-5

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(abstract)

Two-dimensional transition metal dichalcogenides (TMDs) and organic semiconductors (OSCs) have emerged as promising material platforms for next-generation optoelectronic devices. The combination of both is predicted to yield emergent properties while retaining the advantages of their individual components. In OSCs the optoelectronic response is typically dominated by localized Frenkel-type excitons, whereas TMDs host delocalized Wannier-type excitons. However, much less is known about the spatial and electronic characteristics of excitons at hybrid TMD/OSC interfaces, which ultimately determine the possible energy and charge transfer mechanisms across the 2D-organic interface. Here, we use ultrafast momentum microscopy and many-body perturbation theory to elucidate a hybrid exciton at an TMD/OSC interface that forms via the ultrafast resonant Förster energy transfer process. We show that this hybrid exciton has both Frenkel- and Wannier-type contributions: Concomitant intra- and interlayer electron-hole transitions within the OSC layer and across the TMD/OSC interface, respectively, give rise to an exciton wavefunction with mixed Frenkel-Wannier character. By combining theory and experiment, our work provides previously inaccessible insights into the nature of hybrid excitons at TMD/OSC interfaces. It thus paves the way to a fundamental understanding of charge and energy transfer processes across 2D-organic heterostructures.

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Keyword: hybrid excitons
, 2D-organic interface
, energy transfer


Date published: 2025-10-29

Publisher: Springer Science and Business Media LLC

Journal:

  • Nature Physics (ISSN: 17452481) vol. 21 issue. 12 p. 1973-1980

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Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1038/s41567-025-03075-5

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Updated at: 2026-03-03 08:30:21 +0900

Published on MDR: 2026-03-02 17:20:26 +0900

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