Dresden 2020 – wissenschaftliches Programm
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AKjDPG: Arbeitskreis junge DPG
AKjDPG 7: PhD Focus Session: In-situ probes toward better understanding of hybrid halide perovskites II (joint session CPP/AKjDPG)
AKjDPG 7.2: Vortrag
Freitag, 20. März 2020, 10:00–10:15, ZEU 222
In situ reflectometry and air flow control enables modeling of the drying process in blade coated hybrid perovskite solution films. — •Simon Ternes1,2,3, Tobias Börnhorst3, Jonas A. Schwenzer1, Ihteaz M. Hossain1,2, Uli Lemmer1, Philip Scharfer2,3, Wilhelm Schabel3, Bryce S. Richards1,2, and Ulrich W. Paetzold1,2 — 1Light Technology Institute, Karlsruhe, Germany — 2Institute of Microstructure Technology, Eggenstein-Leopoldshafen, Germany — 3Institute of Thermal Process Engineering, Karlsruhe, Germany
In recent years, hybrid perovskite solar cells (PCSs) have been introduced to the field of thin-film photovoltaics, exhibiting not only a steep increase in power conversion efficiencies from 3.8% in 2009 to above 25% to date, but also opening the perspective toward low-cost, large-scale solution processing. However, in order to design industrial-scale printing machines for PCSs in an efficient manner, general modeling of the dynamic drying and crystallization processes in perovskite solution films is required. This modeling must extend beyond trail-and-error optimization and beyond the commonly used, non-scalable spin coating technique. In the work presented here, we demonstrate simultaneous exact drying control by a laminar air flow and in situ film thickness measurements by reflectometry on blade coated perovskite solution films. In this way, we derive a general model of the drying process in these solution films and correlate it with the evolving morphology, providing a strategy of optimal process transfer from spin coating to any industrial coating and drying technique.