Regensburg 2019 – wissenschaftliches Programm

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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 39.7: Hauptvortrag

Mittwoch, 3. April 2019, 17:15–17:45, H14

Thin film structuring upon liquid-vapor mass exchange — •Jasper Michels — Max Planck Institute for Polymer Research, Mainz, Germany

Organic and hybrid thin film electronic devices, such as memory diodes, solar cells and transistors, typically contain a functional layer comprising a blend of polymeric or small-molecular species whose properties cooperatively give rise to a specific function. Depending on the desired device functionality, phase transitions during solution processing of these blends is either encouraged or suppressed. In many cases a microstructure evolves during solidification on account of, for instance, demixing or crystallization from solution. These processes may lead to drop-like or spherulitic structures, with associated feature sizes and domains shapes that depend on the processing conditions.

This presentation focuses on how phase separation couples with mass exchange across the liquid-vapor boundary, i.e. solvent evaporation and vapor condensation. I give an overview of the work we have done to understand the influence of liquid-vapor exchange rates on the dynamics of structure evolution. Modeling multi-component mixtures in the thermodynamic limit elucidates how microstructures evolve. Numerically simulated morphologies are consistent with experimentally observed ones and demonstrate in what way domain size and phase composition are affected by internal and environmental factors.