Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.15: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Doping and Phase Separation in Mixtures of Differently Substituted Phthalocyanines Measured in-situ During Film Growth — •Lena Cornelius, Max Beu, Christopher Keil, and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen

Mixed films of the unsubstituted phthalocyaninato copper (H₁₆PcCu) and its perfluorinated derivative (F₁₆PcCu) with different molecular mixtures were prepared by co-evaporation and were analyzed in-situ by conduction measurements. High admixtures of H₁₆PcCu in F₁₆PcCu films disturbed the charge transport, presumably caused by phase separation and the presence of poorly conducting grains of H₁₆PcCu in the conductive F₁₆PcCu films. Very low admixtures increased the conductivity, indicating a successful doping of F₁₆PcCu by H₁₆PcCu. For pure thin films of F₁₆PcCu well-defined crystal structures (β_bilayer-structure and β-structure) were determined in the literature and correlated to optical absorption bands. Optical transmission spectroscopy performed for the present films revealed the presence of these structures as expected for the pure films of F₁₆PcCu and also for low admixtures of H₁₆PcCu but a disturbance of the F₁₆PcCu solid state structure was seen for increased admixtures of H₁₆PcCu. The proportions of the β_bilayer-structure and the β-structure of F₁₆PcCu were decreased indicating disturbance of the F₁₆PcCu film growth by a large admixture of H₁₆PcCu.