Berlin 2024 – scientific programme
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AKE: Arbeitskreis Energie
AKE 1: Innovative Energy Transformation Concepts
AKE 1.4: Talk
Monday, March 18, 2024, 16:00–16:15, TC 006
On the theoretical framework for meniscus-guided manufacturing of large scale OPV modules — •Fabian Gumpert1, Annika Jannßen1,2,3, Christoph J. Brabec2,3, Hans-Joachim Egelhaaf2,3, Jan Lohbreier1, and Andreas Distler2,3 — 1Technische Hochschule Nürnberg Georg Simon Ohm — 2Friedrich-Alexander-Universität Erlangen-Nürnberg — 3Helmholtz Institut Erlangen-Nürnberg
For the manufacturing of thin films of solution-processable organic semiconductors, e.g. for organic photovoltaics (OPV), meniscus guided-coating techniques are the method of choice for large scale industrial applications. However, the process requires an in-depth understanding to control the resulting film thickness. We propose an analytical expression to describe the layer thickness manufactured with a trapezoidal shaped applicator. Thus, the theoretical expression has the potential to reduce time and resource consuming experiments (e.g. maximum efficiency). For OPV, uniform layers with predefined thicknesses are necessary to achieve desired layer characteristics. For large surfaces, the significant loss of coating fluid beneath the applicator during the coating process leads to decreasing layer thicknesses with increasing coating distances. Here, we propose that an acceleration of the applicator during the process can compensate the liquid loss and thus, leads to a uniform predefined layer thickness. Expressions, which are based on theory and CFD simulation, to describe the velocity as a function of time are derived and validated by experimental data.
Keywords: Organic Photovoltaics; Numerical simulation; Meniscus-guided coating process; Thin film