Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Hybrid and Perovskite Photovoltaics IV (joint session CPP/DF/DS/HL, organized by HL)

CPP 54.10: Vortrag

Donnerstag, 10. März 2016, 17:30–17:45, H2

Infrared spectroscopic study of vibrational modes and water infiltration in methylammonium lead halide perovskites — •Michael Sendner^1,2, Christian Mueller^1,2,3, Tobias Glaser^1,2, Annemarie Pucci^1,2, Wolfgang Kowalsky^1,2,3, and Robert Lovrincic^2,3 — ¹Kirchhoff-Institut für Physik, Universität Heidelberg — ²InnovationLab GmbH, Heidelberg — ³Institut für Hochfrequenztechnik, TU Braunschweig

The interactions of the organic cation with the inorganic lattice in organo-metallic halide perovskites influence the vibrational properties of the cation which can be measured in the mid infrared (IR) spectral region. We determined the infrared optical properties of different methylammonium lead halide perovskite films (CH₃NH₃Pb(I/Br/Cl)₃) and derived the full dielectric function [1]. The peaks of the vibrational modes are assigned by means of the comparison with MP2 calculated modes of the free methylammonium cation. The influence of the inorganic cage and the processing is discussed. Furthermore, we utilize IR spectroscopy to investigate the influence of water onto perovskite thin films. We show that the infiltration of water into CH₃NH₃PbI₃ appears much faster and at much lower humidity than previously known [2]. We suggest a molecular picture of this infiltration where water molecules have a strong impact on the hydrogen bonding between the methylammonium cations and the surrounding Pb-I cage. [1] T. Glaser et al. J. Phys. Chem. Lett. 2015, 6 (15), 2913-2918 [2] C. Müller et al. Chem. Mater., 2015, 27 (22), 7835-7841