Regensburg 2019 – wissenschaftliches Programm
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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 39.1: Hauptvortrag
Mittwoch, 3. April 2019, 15:00–15:30, H14
Film formation, microstructure and ferroelectricity of MAPbI3 light-harvesting layers — Holger Röhm1,2, Tobias Leonhard1,2, Alexander Schulz1,2, Susanne Wagner1,3, Michael Hoffmann1,3, and •Alexander Colsmann1,2 — 1Karlsruhe Institute of Technology (KIT), Material Research Center for Energy Systems, Strasse am Forum 7, 76131 Karlsruhe, Germany — 2Karlsruhe Institute of Technology (KIT), Light Technology Institute (LTI), Engesserstrasse 13, 76131 Karlsruhe, Germany — 3Karlsruhe Institute of Technology (KIT), Institute for Applied Materials - Ceramic Materials and Technologies (IAM), Haid-und-Neu-Strasse 7, 76131 Karlsruhe, Germany
Among the remarkable properties of MAPbI3 is its ferroelectricity. Since the ferroelectric polarization influences the charge carrier recombination and transport, the orientation and shape of polarized domains within grains directly influences the device performance. This renders engineering of the grain orientation and size pivotal for the optimization of perovskite solar cells. In a combined EBSD, PFM and KPFM study, we spatially resolve and correlate the crystal orientation and the ferroelectric polarization of MAPbI3 with sub-grain resolution. These tools are indispensable for the relation of the microscopic thin-film structure to the optoelectronic device properties as they allow to monitor film formation, device optimization and to understand fundamental processes in perovskite solar cells. Understanding the microstructure and the film formation will not least be the key to future ab-initio engineering of new non-toxic and efficient solar cells.