Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 78: Hybrid and Perovskite Photovoltaics II
CPP 78.11: Vortrag
Freitag, 16. März 2018, 12:15–12:30, C 264
macro- and nano-scale morphology evolution during in situ spray coating of titania films for perovskite solar cells — •Bo Su1, Herbert A. Caller-Guzman1, Volker Körstgens1, Yichuan Rui2, Yuan Yao1, Nitin Saxena1, Gonzalo Santoro3, Stephan V. Roth3, and Peter Müller-Buschbaum1 — 1Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, 85748 Garching — 2College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China — 3DESY, 22607 Hamburg
To scale-up deposition processes, the use of spray deposition is advantageous, because it is easy to be controled and has no limitation concerning substrate geometry. In this study, the structure evolution of mesoporous titania films, with a controllable pore size, is characterized by in situ grazing incidence small angle X-ray scattering (GISAXS) during the spray process. For the applied spray conditions, we observe micelle deposition, evaporation of the solvent and transformation of the morphology towards equilibrium. All processes influence the structure features on the nano-scale. On the macro-scale, the kinetics and thermodynamics of the spray depositions processes are simulated. We find a good agreement with the large-scale morphology of the spray-coated films obtained in the experiments. Hybrid perovskite (methylammonium lead iodide) solar cells based on the sprayed titania film are fabricated as a showcase of the developed spray-deposition for solar cell applications.