Dresden 2009 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 23: Organic Thin Films III
DS 23.5: Vortrag
Mittwoch, 25. März 2009, 15:45–16:00, GER 38
Formation of a Polymer-Metal Interface: Deposition of Ca on Poly(3-hexylthiophene) Films — •Fabian Bebensee1, Jack Hess Baricuatro2, Junfa Zhu3, Wanda Lew2, Hans-Peter Steinrück1, J. Michael Gottfried1, and Charles T. Campbell2 — 1Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg — 2Department of Chemistry, University of Washington — 3National Synchrotron Radiadion Laboratory, University of Science and Technology of China
The interface between Ca and poly(3-hexylthiophene) (P3HT) belongs to the technologically important class of interfaces between low work function metals and semiconducting polymers, which can be found in many applications in the rapidly developing field of organic electronics. We used various complementary techniques, including ISS and HR-XPS, to study the morphology, the chemical composition, and the electronic structure of this interface. In addition, we applied adsorption microcalorimetry to quantitatively study the energetics of Ca adsorption on the polymer, a measurement that has only recently become technically feasible. We find a strong interaction between Ca and P3HT, as indicated by a high initial heat of adsorption (629 kJ/mol). Furthermore, the appearance of a new peak doublet in the S2p XP spectra indicates that Ca interacts mainly with the sulphur in the polymer. The XPS data also allow for the determination of the penetration depth of Ca into P3HT, which is between 2.7 and 3.7 nm. Support by the DAAD, the NSF, and the Excellence Cluster "Engineering of Advanced Materials" is gratefully acknowledged.