Dresden 2011 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 62: Organic Thin Films I
DS 62.5: Vortrag
Freitag, 18. März 2011, 11:15–11:30, GER 38
Reversible light-controlled capacity switching of chromophore based metal/polymer nanocomposites — •Christina Pakula1, Sri Wahyuni Basuki1, Vladimir Zaporojtchenko1, Thomas Strunskus1, Dordaneh Zargarani2, Rainer Herges2, and Franz Faupel1 — 1Institut für Materialwissenschaft - Materialverbunde, Technische Fakultät der Christian-Albrechts-Universität zu Kiel, Kaiserstr. 2, 24143 Kiel, Germany — 2Institut für Organische Chemie, CAU Kiel, Otto-Hahn-Platz 4, 24098 Kiel, Germany
Electro-optical switching based on photochromism is under extensive research nowadays, due to applications in the new generation of organic electronics ranging from non-linear optical devices and optical switches to information storage. We report on photo-switchable AC conductance of nano sheet capacitors which are produced by sandwiching some hundred nm or µm thick polymer films containing dissolved chromophores between transparent percolated Pt nanoparticle electrodes. The photoactive thin polymer films show a complete and fully reversible switching of the capacitance with changes > 50% [1]. This change is correlated to the azo dye concentration. We observe an increase in the capacitance change with increasing temperature below and also in a small range above the glass transition temperature of the polymer blend. The dependence of the capacitance changes on the irradiation wavelength and on application of an electrical field under irradiation is discussed.
[1] Zaporojtchenko, V, Pakula, C, Basuki, SW, Strunskus, T, Zargarani, D, Herges, R, Faupel, F Applied Physics A, accepted.