Regensburg 2019 – wissenschaftliches Programm
AKjDPG 1: PhD Focus Session: Photoluminescence of halide perovskites: What does it tell us and what not? (joint session DS/HL/AKjDPG)
AKjDPG 1.2: Vortrag
Dienstag, 2. April 2019, 10:00–10:15, H32
In-situ film formation studies of metal-halide perovskite layers — •Katrin Hirselandt1,2, Rahim Munir1, Florian Mathies1, Aboma Merdasa1, Emil J. W. List-Kratochvil2, and Eva Unger1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, 12489 Berlin, Germany — 2Institut für Physik, Institut für Chemie & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 6, 12489 Berlin, Germany
By optimizing the perovskite fabrication process during spin-coating by introduction of complex solvent blends and quenching steps, solar cells with power conversion efficiencies above 22% have been realized on small active areas. Reproducing published fabrication procedures is not trivial as process conditions vary from place to place and adapting methodologies developed for small-area devices based on spin-coating to larger area devices even less so. Understanding the film formation during different stages of processing allows for a more rational approach to translate deposition strategies to scalable processing methods.
In this study we compared the temporal evolution of MAPbI3 and Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3 (3CAT) covered substrates during spin-coating using a fibre-optic based photoluminescence and reflection spectroscopy setup. Varying the time of a crystallization-inducing anti-solvent drip, we identified a much narrower process window for MAPbI3, compared to 3CAT corroborated with scanning electron microscope images of annealed samples. We here present insight into the difference in crystallization kinetics of these different standard formulations for perovskite processing.