Title:	Drying Dynamics of Solution-Processed Perovskite Thin-Films
Author(s):	S. Ternes, T. Börnhorst, J.A. Schwenzer, I.M. Hossain, H.M. Pham, T. Abzieher, T.J. Feeney, U. Lemmer, P. Scharfer, W. Schabel, B.S. Richards, U.W. Paetzold
Topic:	Perovskites and Other Non-Silicon Materials, MJs and Tandems
Subtopic:	Perovskites
Event:	37th European Photovoltaic Solar Energy Conference and Exhibition
Session:	3BO.9.1
ISBN:	3-936338-73-6
Price:	0,00 EUR
Document(s):	presentation

Abstract/Summary:

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The champion power conversion efficiencies of organometal perovskite photovoltaics have all been realized via spin-coating, however the possibility of transferring these results to large scale coating and drying machines is limited. In this work, we present a novel and innovative strategy of process transfer affording the simultaneous exact control of the drying process via a laminar flow channel and in situ monitoring of the solution film thickness over time on multiple probing positions with laser interferometry. Our findings result in a general and comprehensive model for the drying process of perovskite thin-films in terms of general drying parameters which we correlate with the evolving polycrystalline thin-film morphology. In this way, we transfer the fabrication of methylammonium lead iodide perovskite absorber layers from spin-coating to blade-coating, yielding reproducible, stabilized PCEs over 17% in small-scale test devices. The derived drying model can potentially be used to predict general coating windows for obtaining homogeneous and pinhole-free morphologies in large scale dryers beyond trial-and-error optimization.