Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Solid-Liquid Interfaces II: Reactions and Electrochemistry
O 45.6: Talk
Tuesday, March 17, 2020, 12:00–12:15, WIL C107
Dependence of Electron and Ion Transport on the Intermolecular Coupling in Fluorinated Phthalocyanine Thin Films as Electrochromic Materials — •Thi Hai Quyen Nguyen1, Marius Pelmus2, Sergiu M. Gorun2, and Derck Schlettwein1 — 1Justus Liebig University Gießen, Institute of Applied Physics — 2Seton Hall University, Department of Chemistry and Biochemistry
Phthalocyanines as organic ionic and electronic conductors are of great interest for the application in electrochromic devices. An influence of the degree of fluorination in copper phthalocyanines on the intermolecular coupling of the molecules in the solid state and, thus, on the rate of electron and ion transport was observed: For F16PcCu the transport of electrons was faster than the diffusion of ions as opposed to F64PcCu. In this work, thin films of a new type of fluorinated phthalocyanine (F40PcCu) were prepared by physical vapor deposition. The dependence of the intermolecular coupling on the film thickness was analyzed by in situ UV/Vis spectroscopy. The transport of electrons and ions in these films as well as their electrochromic behaviour were investigated by electrochemical and spectroelectrochemical measurements with an aqueous solution of KCl as electrolyte. The films provided a well-balanced, equally fast transport of electrons and ions. The optical absorption spectra revealed reversible changes of the films upon reduction with intercalation of the K+ counter ions and re-oxidation with extraction of the counter ions. Fast and stable electrochromic switching of the films was achieved over at least 200 cycles.