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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.9: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1A
Influence of Different Organic Cation and Halide Combinations on the Crystallization Dynamics of Perovskite Thin Films — •Ekaterina Kneschaurek, Alexander Hinderhofer, and Frank Schreiber — Institute for Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
Understanding the kinetic and energetic effects during organic-inorganic perovskite film growth is very important, since they determine how ions distribute in the structure, which affects the optoelectronic properties of the perovskite film. By tuning the composition of the perovskite films, the growth and formation of perovskite crystals and the extraordinary photophysical properties of perovskite materials can be significantly improved. The initial composition and formation mechanism define crystallization dynamics and structural properties of the resulting thin film. Samples with different compositions of MPbX3 (M = CH3NH3+, CH(NH2)2+, Cs+ or Rb+ and X= Br−, I− or a mixture) were produced using one-step conversion, a common fabrication technique. The perovskite crystal formation was induced by annealing. We applied in situ grazing incidence wide angle X-ray scattering (GIWAXS) to determine the reaction rate, intermediate phases during growth and perovskite unit cell parameter change in several perovskite thin films over time.[1] We discuss how combining lead halide precursors with different organic and inorganic halide solutions can impact the quality and time scale of the structural and morphological development of the spin-coated perovskite thin films.
1. A. Greco et. al., J. Phys Chem Lett., 2018, 6750