(581b) Understanding Crystallization of Oriented Domains in Solution Printed Organic Semiconductor Thin Films
AIChE Annual Meeting
2018 AIChE Annual Meeting
Materials Engineering and Sciences Division
Polymer Phase Change and Assembly
Wednesday, October 31, 2018 - 4:00pm to 4:15pm
In this work, we employed diverse characterization methods to understand and develop generally applicable design rules for molecular orientation and morphology control in conjugated polymer thin films. We hypothesize that the out-of-plane molecular orientation of a semiconducting polymer is jointly determined by intermolecular interactions (thermodynamic driving force) and the rate of aggregation near the polymer-substrate interface (kinetic pathway), both of which are sensitively modulated by the solution coating conditions and the polymer and substrate properties. We directly obtained the crystallization kinetics of conjugated polymers by monitoring polymer aggregation in situ during solution coating. We also evaluated polymer self-interactions and polymer-substrate interactions to help determine the thermodynamically favored molecular orientation. Our work will enable rational design approaches for controlling out-of-plane molecular orientation and the resulting electronic properties of advanced (opto)electronic devices, as well as having a broad and profound impact that goes far beyond organic heterojunction devices.