journal article·2024-06-14

Polaronic Mass Enhancement and Polaronic Excitons in Metal Halide Perovskites

Michal Baranowski, Andrzej Nowok, Krzysztof Galkowski, Mateusz Dyksik, Alessandro Surrente, Duncan Maude, Marios Zacharias, George Volonakis, Samuel D. Stranks, Jacky Even, Miroslaw Maczka, Robin Nicholas, Paulina Plochocka

ACS Energy Letters· Volume 9· Issue 6
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Abstract

In metal halide perovskites, the complex dielectric screening together with low energy of phonon modes leads to non-negligible Fröhlich coupling. While this feature of perovskites has already been used to explain some of the puzzling aspects of carrier transport in these materials, the possible impact of polaronic effects on the optical response, especially excitonic properties, is much less explored. Here, with the use of magneto-optical spectroscopy, we revealed the non-hydrogenic character of the excitons in metal halide perovskites, resulting from the pronounced Fröhlich coupling. Our results can be well described by the polaronic-exciton picture where electron and hole interactions are no longer described by a Coulomb potential. Furthermore, we show experimental evidence that the carrier-phonon interaction leads to the enhancement of the carrier's effective mass. Notably, our measurements reveal a pronounced temperature dependence of the carrier's effective mass, which we attribute to a band structure renormalization induced by the population of low-energy phonon modes. This interpretation finds support in our first-principles calculations.
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OpenAlex topics: Tannin, Tannase and Anticancer Activities · Protein Hydrolysis and Bioactive Peptides · Medicinal Plant Research

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Affiliations

Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland

Laboratoire National des Champs Magnétiques Intenses, EMFL, CNRS UPR 3228, Université Toulouse, Université Toulouse 3, INSA-T, 31400 Toulouse, France

Université Rennes, INSA Rennes, CNRS, Institut FOTON - UMR 6082, F-35000 Rennes, France

Université Rennes, ENSCR, INSA Rennes, CNRS, ISCR - UMR 6226, F-35000 Rennes, France

Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom

Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, United Kingdom

Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okolna 2, 50-422 Wroclaw, Poland

Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom

Funding

Engineering and Physical Sciences Research Council · Royal Society · Agence Nationale de la Recherche · Narodowe Centrum Nauki · Tata Sons · British Council · H2020 Marie Sklodowska-Curie Actions

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