SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 19: Organic Electronics and Photovoltaics I (joint session CPP/HL)

HL 19.4: Talk

Tuesday, March 28, 2023, 10:15–10:30, GÖR 226

Controlling long-range order in dip coated piezo- and ferroelectric molecular materials — •Andrey Butkevich and Martijn Kemerink — Institute for Molecular Systems Engineering and Advanced Materials, Im Neuenheimer Feld 225, 69120 Heidelberg, Germany

Organic piezo- and ferroelectrics are of great interest due to their tunable properties. However, the extensive procedures that are often required to achieve saturation polarization limit their possible applications. A so far unexplored possible solution is to pre-align the molecules during the deposition from solution. Here, we analyzed the effect of dip coating parameters on the alignment of multiple supramolecular piezo- and ferroelectrics. Dip coated films were characterized for different material concentrations and dip coating velocities. The investigation revealed that morphologies with strong alignment along the dip coating direction are formed for both material types. For ferroelectrics, the changes in the ferroelectric switching behavior of the resulting thin films were investigated. The ferroelectric switching was investigated using the double wave method, revealing that dip coating perpendicular to the electrodes leads to an almost perfect in-plane alignment of the supramolecular polymers, which was confirmed by X-ray diffraction. The observed switching behavior was comparable to films that were aligned via conventional field-annealing. Hence, dip coating enhanced the ferroelectric switching in the investigated molecules, which we anticipate can be directly transferable to other molecular ferroelectrics.