Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 85: Organic Semiconductors: Transistors and OLEDS
HL 85.2: Vortrag
Donnerstag, 29. März 2012, 15:15–15:30, EW 203
IR spectroscopy at the ITO-organic interface — •Milan Alt1, Ahmad Shazada3, Akemi Tamanai2, Jens Trollmann2, Tobias Glaser2, Sebastian Beck2, Sven Tengeler2, and Annemarie Pucci2 — 1Karlsruher Institut für Technologie, Karlsruhe, Germany — 2Kirchhoff-Institut für Physik, Heidelberg, Germany — 3Max-Planck Institut für Polymerforschung, Mainz, Germany
Thin films of P3HT have been prepared by spin coating and electrooxidative polymerization on platinum- and ITO-coated substrates. Additionally, P3HT-films on silicon substrates have been prepared by spin coating only. The measured IR spectra of the spin coated films allowed for an elaboration of a detailed optical model for P3HT, which has been used to simulate IR reflection-absorption spectra on ITO and Pt substrates. Comparison of simulated spectra with measurements revealed no substrate influence on the IR spectra for the spincoated films. In case of spincoated P3HT-films on ITO-substrate, the obtained IR spectra correspond to simulation data very well up to 6000 wavenumbers. In the electropolymerized P3HT films we have identified residuals of the electrolyte ionic liquid, acting as dopand for P3HT. While IR spectra of the electropolymerized P3HT films on Pt substrate could be explained reasonably well as a superposition of chemically doped P3HT and the ionic electrolyte, the IR spectra of electropolymerized P3HT films on ITO substrates showed strongly deposition-time dependent deviations. These were most likely related to varying properties of the ITO surface between reference and sample measurement due to an interaction of ITO and the electrolyte at the film-substrate interface.