Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Hybrid and Perovskite Photovoltaics II
CPP 19.9: Vortrag
Dienstag, 2. April 2019, 11:45–12:00, H18
Kinetics of Ion-Exchange Reactions in Hybrid Organic–Inorganic Perovskite Thin Films Studied by In Situ Real-Time X-ray Scattering — •Alessandro Greco1, Alexander Hinderhofer1, M. Ibrahim Dar2, Neha Arora2, Jan Hagenlocher1, Andrey Chumakov3, Michael Grätzel2, and Frank Schreiber1 — 1Institute for Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany — 2Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Switzerland — 3European Synchrotron Radiation Facility, 71, Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France
The exchange of ions in hybrid organic–inorganic perovskites with the general formula APbX3 (A = MA, FA; X = I, Cl, Br) is studied in five different systems using in situ real-time X-ray diffraction. In systems where the organic cation is exchanged, we find a continuous shift of the lattice parameter. The relative shift compared to the pure materials is used to quantify the exchange. Whether or not a conversion is possible, as well as the amount of exchanged cations, depends on the halide used. In the case of the interconversion of MAPbI3 and MAPbCl3, we observe a decay of the diffraction peaks of the original perovskite and the emergence of new peaks corresponding to the structure with the alternative halide. Moreover, we determined the relevant time scales of the growth and decay of the perovskite structures. [1]
[1] A. Greco et al., J. Phys. Chem. Lett., 2018, 6750 (DOI: 10.1021/acs.jpclett.8b02916)