Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.51: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Phase separation in vacuum co-deposited pentacene/6,13-pentacenequinone thin films — •Ingo Salzmann1, Ricarda Opitz1, Siegfried Rogaschewski1, Jürgen Rabe1, Norbert Koch1, and Bert Nickel2 — 1Humboldt-Universität zu Berlin, Institut für Physik, Newtonstraße 15, D-12489 Berlin, Germany — 2Ludwig-Maximilians-Universität, Department für Physik and CeNS, Geschwister-Scholl-Platz 1, D-80539 München, Germany
Pentacene (P) and 6,13-pentacenequinone (PQ) have been vacuum co-deposited onto SiO2 in order to control phase separation in thin films for the application as bulk heterojunctions in organic photovoltaic devices. Structural investigations by means of scanning electron microscopy (SEM) and atomic force microscopy (AFM) revealed pronounced phase separation of the two materials at length scales that turned out to be tuneable by the variation of the deposition rate. X-ray diffraction (XRD) provided evidence for polymorphism in pure films of P and PQ on SiO2. While pure films exhibited both the bulk and thin film phase, the bulk phase is mainly suppressed within the co-deposited films (P+PQ). This was corroborated by Fourier-transform infrared spectroscopy (FT-IR) results. SEM investigations of pure and co-deposited films indicated that PQ bulk crystallites of up to 200nm height form continuous paths to the substrate and grow within a matrix formed of P and PQ thin film phases. The obtained heterojunction morphologies thus appear interesting for the application in organic-based photovoltaic cells.