BPCPPDYSOE21 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Perovskites - organized by Eva M. Herzig (University of Bayreuth, Bayreuth)

CPP 7.3: Talk

Tuesday, March 23, 2021, 09:40–10:00, CPPa

In situ reflectometry and air flow control enables modeling of the drying process in blade coated hybrid perovskite solution films. — •Simon Ternes^1,2,3, Tobias Börnhorst³, Jonas A. Schwenzer¹, Ihteaz M. Hossain^1,2, Uli Lemmer¹, Philip Scharfer^2,3, Wilhelm Schabel³, Bryce S. Richards^1,2, and Ulrich W. Paetzold^1,2 — 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.