Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 33: Poster: Thin Films: Applications, Transport and Phase Change Materials
DS 33.6: Poster
Wednesday, March 18, 2020, 15:00–18:00, P1A
In-operando studies on thiophene based organic field-effect transistors — •Manuel Johnson1, Tim Hawly1, Baolin Zhao2, Marcus Halik2, and Rainer Fink1 — 1Lehrstuhl für Physikalische Chemie II, FAU Erlangen-Nürnberg, Germany — 2Lehrstuhl für Werkstoffwissenschaften II, FAU Erlangen-Nürnberg, Germany
Organic field effect transistors have drawn growing interest for novel electronic applications like backplanes for flexible displays or low-cost circuits for sensor applications. Main reason for this has been their increased performance due to the development of materials with improved charge carriers mobility and environmental stability [1]. Nevertheless, there are still open questions regarding charge carrier transport and its mechanism. To address this issue we performed Raman and Kelvin probe force microscopy studies to get an insight into our devices, based on pentacene and different thiophene derivatives while operating the devices. We observe a permanent change in the surface potential after the first device stress (i.e. functional operation) and a reversible potential increase during device operation. Furthermore, we found that the permanent potential change is homogenous across the device while the reversible effect is strongly correlated to the local microstructure. We interpret these findings as different effects of charge trapping, whereby the permanent charge trapping takes place inside the dielectric layer while the reversible charge trapping happens inside the organic semiconductor film and at the organic-dielectric interface. This research is funded by the DFG within GRK1896.
[1] D. Natali, et al., Adv. Mater. 2012, 24, 1357