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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Focus: Controlling Phase Formation Dynamics in Solution Processed Semiconductors - organized by Christoph Brabec, Jens Harting and Hans-Joachim Egelhaaf

CPP 39.2: Hauptvortrag

Mittwoch, 3. April 2019, 15:30–16:00, H14

How do evaporating thin films evolve? Unravelling phase-separation mechanisms during solvent-based fabrication of polymer blends — •Olga Wodo — University at Buffalo, Materials Design and Innovation Department

Solvent-based fabrication is a flexible and affordable approach to manufacture organic thin films made from any combination of polymer, copolymers and/or small molecules. It is of paramount importance to understand morphology evolution during fabrication. However, it is challenging to experimentally visualize morphology evolution during processing.

In this talk, I will present our computational model to predict the evolving three-dimensional morphology during the fabrication of organic thin films. I will focus on multiscale challenges that when addressed allowed to resolve nano-morphological features while being able to simulate device scale domains. More importantly, I will discuss four modes of phase formation and subsequent propagation within the thinning film during solvent-based fabrication. I will address fundamental questions such as when and where phases are formed, and how they evolve to form the final structure. Finally, I will demonstrate how this analysis can be leveraged to ask questions on manufacturing designs with the ultimate goal of precise, yet affordable, morphology manipulation for a large spectrum of applications.