Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster: Organic Semiconductors

CPP 24.17: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

In situ structural and electrical studies of P3HT droplet solidification — Linda Grodd, •Eduard Mikayelyan, Ullrich Pietsch, and Souren Grigorian — Solid State Physics, University of Siegen, Siegen, Germany

Due to it’s good semiconducting properties poly(3-hexylthiophene) (P3HT) is a promising candidate for organic field effect transistors (OFETs). Thus, there is a lot of effort to understand a conduction mechanism and to tune the material properties to receive optimal performance of the final device.

In our studies we investigated the structural and electrical properties of P3HT during the solidification process from the solution to the thin film formation stage. P3HT/chloroform solution was dropped onto Si/SiO₂ substrates with source/drain electrodes to which a fixed voltage was applied. During solidification the structure was investigated by monitoring the (100) reflection and (020) reflection, respectively, using grazing incidence x-ray diffraction (GIXD). Simultaneously, the source/drain current was recorded.

Interestingly, the measurements revealed that the current was peaking just before the Bragg peak intensity had reached its final maximum at the constant level. This fact leads to the conclusion that not only crystalline order, represented by Bragg peak intensity, but the overall network connection is a key parameter for high conductivity.

We gratefully acknowledge the BMBF, Germany for financial support.