Polaronic Mass Enhancement and Polaronic Excitons in Metal Halide Perovskites - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ACS Energy Letters Année : 2024

Polaronic Mass Enhancement and Polaronic Excitons in Metal Halide Perovskites

Michał Baranowski
Samuel Stranks
Robin Nicholas

Résumé

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.

Dates et versions

hal-04596394 , version 1 (31-05-2024)

Identifiants

Citer

Michał Baranowski, Andrzej Nowok, Krzysztof Galkowski, Mateusz Dyksik, Alessandro Surrente, et al.. Polaronic Mass Enhancement and Polaronic Excitons in Metal Halide Perovskites. ACS Energy Letters, 2024, 9 (6), pp.2696-2702. ⟨10.1021/acsenergylett.4c00905⟩. ⟨hal-04596394⟩
12 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More