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Vibrational Coupling between Organic and Inorganic Sublattices of Hybrid Perovskites
Author(s) -
Grechko Maksim,
Bretschneider Simon A.,
Vietze Laura,
Kim Heejae,
Bonn Mischa
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201806676
Subject(s) - delocalized electron , polaron , phonon , formamidinium , chemical physics , coupling (piping) , molecular vibration , relaxation (psychology) , organic semiconductor , condensed matter physics , chemistry , raman spectroscopy , materials science , physics , electron , perovskite (structure) , crystallography , quantum mechanics , optoelectronics , psychology , social psychology , organic chemistry , metallurgy
The interplay of electronic and nuclear degrees of freedom in semiconductor hybrid organic–inorganic perovskites determines many of their fundamental photophysical properties. For instance, charge carriers are dressed with phonons, that is, form polarons, and combination modes composed of strongly mixed localized vibrations and delocalized phonons can provide pathways for electronic energy relaxation and dissipation. Mixing of the different types of nuclear motion in vibrational combination modes requires their strong coupling. The direct measurement of coupling between the high‐frequency N−H stretch modes of the organic methylammonium and formamidinium ions and low‐frequency Pb−I phonon modes of the inorganic sub‐lattice in hybrid organic–inorganic perovskites is presented. The results reveal direct and substantial coupling between the non‐covalently interacting organic and inorganic sub‐lattices.