Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.42: Poster

Monday, March 14, 2011, 17:30–19:30, P2

(contribution withdrawn) In-situ GIXRD studies of current induced structural changes of P3HT thin films — •Linda Grodd, Anton Davydok, Souren Grigorian, and Ullrich Pietsch — Solid State Physics, University of Siegen, Siegen, Germany

Conjugated polymers are of great interest for electronic applications. Especially, the poly(3-hexylthiophene) (P3HT) is a promising candidate for application in organic thin film transistors (OFETs). The correlation of electric and structural properties is essential for understanding the processes that are taking place inside the polymer, and in particular, charge transfer processes.

In-situ studies of P3HT OFETs were done by using synchrotron radiation in GIXRD geometry. The 100 reflection of a drop casted P3HT film was monitored while applying voltages between 0V and 100V to source and drain of the sample with top contacts geometry. A channel length of 2 mm ensured that the whole conducting area of polymer was illuminated by the synchrotron beam. Simultaneously to the structural studies, the current at the fixed voltage was also recorded.

The current-voltage characteristics were featuring a sudden increase of the current by several orders of magnitudes from uA range to mA range. For the latter one, a reversible change of the d(100) spacing of about 1.3% has been observed.