TY - JOUR
T1 - Revealing Excitonic Phonon Coupling in (PEA)2(MA)n-1PbnI3 n+12D Layered Perovskites
AU - Urban, Joanna M.
AU - Chehade, Gabriel
AU - Dyksik, Mateusz
AU - Menahem, Matan
AU - Surrente, Alessandro
AU - Trippé-Allard, Gaëlle
AU - Maude, Duncan K.
AU - Garrot, Damien
AU - Yaffe, Omer
AU - Deleporte, Emmanuelle
AU - Plochocka, Paulina
AU - Baranowski, Michal
N1 - Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/8/6
Y1 - 2020/8/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85089608602&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.0c01714
DO - 10.1021/acs.jpclett.0c01714
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C2 - 32597181
AN - SCOPUS:85089608602
SN - 1948-7185
VL - 11
SP - 5830
EP - 5835
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 15
ER -