Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 39: Focus: Controlling Phase Formation Dynamics in Solution Processed Semiconductors - organized by Christoph Brabec, Jens Harting and Hans-Joachim Egelhaaf
CPP 39.10: Talk
Wednesday, April 3, 2019, 18:15–18:30, H14
On the colloidal behaviour of hybrid perovskite precursor dispersion and tracking structural heterogeneties arising from mixed perovskites: insights into the nano and macroscale — •Shambhavi Pratap1, 2, Johannes Schlipf1, Kiran John1, Volker Körstgens1, Felix Fischer1, Sundeep Vema3, Alexander Holleitner4, Anton Davydok5, Christina Krywka5, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching — 2Lawrence Berkeley National Laboratory, Advanced Light Source — 3Cambridge University, Department of Chemical Engineering — 4TU München, Walter Schottky Institut — 5DESY, Helmholtz Zentrum Geesthacht, Hamburg
A colloidal nature of perovskite precursors used for film fabrication is suggested, and phenomena such as glass-transitions, crystal twinning, and growth instabilities are explored in order to explain diffusion-limited self-organization of thin films. Morphological and structural heterogeneties within thin films are identified to be a consequence of deposition through dynamic precursors, far from thermodynamic equilibrium. The significance of such a finding suggests that perovskite films possess soft properties, implying there exists a delicate balance between entropic and enthalpic contributions towards the free energy of the dynamically changing system, which needs to be regulated for controlling film morphology; which has been established as a crucial prerequisite for improving solar cell performances.