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Peer-reviewedCC BYChemical science

Ultrafast interphase exciton funneling in alternating-cation 2D perovskites through Förster-type energy transfer.

  • Supriya Ghosh1,2
  • Peiran Wang2
  • Heinz Amenitsch3
  • Sumea Klokic3
  • Pavel Chabera1,4
  • Christian Sternemann5
  • Bapi Pradhan2
  • Johan Hofkens2,6
  • Tönu Pullerits1
6 affiliations
  1. 1Division of Chemical Physics and NanoLund, Lund University Box 124 22100 Lund Sweden [email protected] [email protected] +46 46 222 81 31 +32 466 34 44 34.
  2. 2Department of Chemistry, KU Leuven Celestijnenlaan 200F 3001 Heverlee Belgium [email protected] +32 465 43 23 04.
  3. 3Institute of Inorganic Chemistry, Graz University of Technology Stremayrgasse 9/IV Graz 8010 Austria.
  4. 4Department of Physics, College of Science, United Arab Emirates University P.O. Box 15551 Al Ain United Arab Emirates.
  5. 5Fakultät Physik/DELTA, Technische Universität Dortmund 44221 Dortmund Germany.
  6. 6Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany [email protected] +32 16 32 78 04.
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Abstract

Efficient exciton transport is central to the development of low-dimensional semiconductors for optoelectronic applications. Layered metal halide perovskites provide a versatile platform for regulating excitonic interactions through spacer-layer engineering. Here, we demonstrate that alternating-cation-in-the-interlayer space (ACI) perovskites exhibit markedly rapid interphase exciton funneling compared with conventional Ruddlesden-Popper (RP) and Dion-Jacobson (DJ) architectures. Using femtosecond transient absorption and time-resolved photoluminescence spectroscopy, complemented by full-spectrum global analysis, we reveal rapid exciton transfer from lower-n toward higher-n quantum wells. The concomitant decay of lower-n excitonic signals and growth of higher-n features, together with the species-associated spectral evolution, are consistent with a predominantly Förster-type interphase energy-transfer mechanism. The characteristic early-time dynamics correlate with shorter interlayer spacing along the stacking direction, suggesting that spacer-layer architecture contributes to modulation of interphase excitonic coupling. While differences in phase distribution, spectral overlap, and domain morphology may additionally influence the measured dynamics, these results establish spacer-layer engineering as an effective strategy for regulating ultrafast energy flow in layered excitonic semiconductors.

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Cite

BibTeXRIS
BibTeX
@article{ghosh2026ultrafast,
  title = {{Ultrafast interphase exciton funneling in alternating-cation 2D perovskites through Förster-type energy transfer.}},
  author = {Supriya Ghosh and Peiran Wang and Heinz Amenitsch and Sumea Klokic and Pavel Chabera and Christian Sternemann and Bapi Pradhan and Johan Hofkens and Tönu Pullerits},
  journal = {Chemical science},
  year = {2026},
  month = oct,
  doi = {10.1039/d6sc06761a},
  url = {https://europepmc.org/article/MED/42899127},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Ultrafast interphase exciton funneling in alternating-cation 2D perovskites through Förster-type energy transfer.
AU  - Supriya Ghosh
AU  - Peiran Wang
AU  - Heinz Amenitsch
AU  - Sumea Klokic
AU  - Pavel Chabera
AU  - Christian Sternemann
AU  - Bapi Pradhan
AU  - Johan Hofkens
AU  - Tönu Pullerits
PY  - 2026
DA  - 2026/10/13
JO  - Chemical science
DO  - 10.1039/d6sc06761a
UR  - https://europepmc.org/article/MED/42899127
AB  - Efficient exciton transport is central to the development of low-dimensional semiconductors for optoelectronic applications. Layered metal halide perovskites provide a versatile platform for regulating excitonic interactions through spacer-layer engineering. Here, we demonstrate that alternating-cation-in-the-interlayer space (ACI) perovskites exhibit markedly rapid interphase exciton funneling compared with conventional Ruddlesden-Popper (RP) and Dion-Jacobson (DJ) architectures. Using femtosecond transient absorption and time-resolved photoluminescence spectroscopy, complemented by full-spectrum global analysis, we reveal rapid exciton transfer from lower-n toward higher-n quantum wells. The concomitant decay of lower-n excitonic signals and growth of higher-n features, together with the species-associated spectral evolution, are consistent with a predominantly Förster-type interphase energy-transfer mechanism. The characteristic early-time dynamics correlate with shorter interlayer spacing along the stacking direction, suggesting that spacer-layer architecture contributes to modulation of interphase excitonic coupling. While differences in phase distribution, spectral overlap, and domain morphology may additionally influence the measured dynamics, these results establish spacer-layer engineering as an effective strategy for regulating ultrafast energy flow in layered excitonic semiconductors.
SN  - 2041-6520
SN  - 2041-6539
ER  -