Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 76: Organic, Polymeric, Biomolecular Films - also with Adsorbates
O 76.1: Talk
Thursday, February 28, 2008, 15:15–15:30, MA 043
The Adsorption of Calcium on Regioregular Poly(3-Hexylthiophene) Studied by Microcalorimetry and X-Ray Photoemission Spectroscopy — •Fabian Bebensee1, Wanda Lew2, Junfa Zhu3, Jack Hess Baricuatro2, Hans-Peter Steinrück1, J. Michael Gottfried1, and Charles T. Campbell2 — 1Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, Germany — 2Department of Chemistry, University of Washington, Seattle, WA 98195, USA — 3National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China
Regioregular poly(3-hexylthiophene) (rr-P3HT) is a semiconducting polymer used in organic electronics (OLED, OFET). In such applications, the interface structure and the interaction strength between the polymer and the electrode (e.g. Ca) play a crucial role in the performance of the device. The energetics of the interface, which directly reflects the interactions strength between the polymer and the metal film, is not accessible with conventional surface science techniques, but can be studied using adsorption microcalorimetry. We present a microcalorimetric study of the adsorption of Ca onto freshly prepared and, via electron irradiation, predamaged rr-P3HT films. Calorimetric measurements are supplemented by high-resolution XPS. The unusual combination of these complementary techniques leads to a new level of understanding of this technologically relevant interface. Financial support by the DAAD and the NSF is gratefully acknowledged.