Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 23: POSTER Functional Organic Thin Films
CPP 23.6: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Structure and Crystallinity Study of Conjugated Polymers — •siddharth Joshi1, Ullrich Pietsch1, Souren Grigorian1, Achmad Zen2, and Dieter Neher2 — 1Festkörperphysik , Universität Siegen, Siegen, Germany — 2Institut für Physik, Universität Potsdam, Potsdam, Germany
The molecular aggregation structure of organic thin films based on semiconducting conjugated polymers has received much attention due to application to polymer electronic devices such as light-emitting diodes, field-effect transistors (FETs) and photovoltaic cells (PVs). One central problem in organic field-effect transistor concerns with the relatively low charge-carrier mobility compared to semiconductor devices. Our current studies are focussed on structure investigations of polymer thin films. Using Ruland*s method several fractions of regioregular (RR) polymers (P3HT, P3dHT) with different molecular weight fractions. To have access to thin films of about 10 nm thickness we used the grazing incidence X-ray diffraction (GIXD) and synchrotron radiation. We determined the degree of crystallinity, and average size of crystallites in polymer films. At the same time we have also employed atomic force microscopy AFM (tapping mode) and X-ray reflectivity methods to study the surface morphology and average thickness of organic thin film. As major result we found that polymers with low molecular weight show a higher degree of crystallinity compared to films with high molecular weight. The results of this structure investigations can used to interpret the charge-carrier mobility for OFETs.