Revealing Excitonic Phonon Coupling in (PEA)2(MA)n-1PbnI3 n+12D Layered Perovskites

Joanna M. Urban, Gabriel Chehade, Mateusz Dyksik, Matan Menahem, Alessandro Surrente, Gaëlle Trippé-Allard, Duncan K. Maude, Damien Garrot, Omer Yaffe, Emmanuelle Deleporte, Paulina Plochocka, Michal Baranowski

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


The family of 2D Ruddlesden-Popper perovskites is currently attracting great interest of the scientific community as highly promising materials for energy harvesting and light emission applications. Despite the fact that these materials are known for decades, only recently has it become apparent that their optical properties are driven by the exciton-phonon coupling, which is controlled by the organic spacers. However, the detailed mechanism of this coupling, which gives rise to complex absorption and emission spectra, is the subject of ongoing controversy. In this work we show that the particularly rich, absorption spectra of (PEA)2(CH3NH3)n-1PbnI3n+1 (where PEA stands for phenylethylammonium and n = 1, 2, 3), are related to a vibronic progression of excitonic transition. In contrast to other two-dimensional perovskites, we observe a coupling to a high-energy (40 meV) phonon mode probably related to the torsional motion of the NH3+ head of the organic spacer.

Original languageEnglish
Pages (from-to)5830-5835
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number15
StatePublished - 6 Aug 2020
Externally publishedYes

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Copyright © 2020 American Chemical Society.


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