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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 53: Perovskite and Hybrid Photovolatics I (joint session HL/CPP)

CPP 53.5: Vortrag

Donnerstag, 4. April 2019, 10:30–10:45, H36

Effect of the organic cation in halide perovskites on vibrations in the far-infrared region: a combined theoretical-experimental study — •Christian Gehrmann1, Michael Sendner2,3, Sebastian Beck2,3,4, Robert Lovrincic2,4, and David A. Egger11Institute of Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — 2InnovationLab, 69115 Heidelberg, Germany — 3Kirchhoff Institute for Physics, Heidelberg University, 69120 Heidelberg, Germany — 4Institute for High Frequency Technology, TU Braunschweig, 38106 Braunschweig, Germany

Halide perovskites (HaPs) are intriguing optoelectronic materials. In particular, hybrid organic-inorganic HaPs have attracted much interest as possible solar-cell materials. Since phonons might be the dominant source of scattering for charge carriers at room temperature, special efforts should be made to understand lattice dynamics in HaPs. While the internal vibrations of the organic cation are mainly in the mid-infrared region, we study the impact of the cation on vibrations in the far-infrared region by comparing the hybrid MAPbBr3 to the all-inorganic CsPbBr3. To this end, we present lattice dynamics calculations, based on density functional theory. The theoretical results are compared to experimental data obtained from far-infrared spectroscopy. Using reflectance measurements, we can even present experimental results related to the LO phonons which are not infrared active, but inherently contained in our calculations.

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