Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 46: Poster 2

HL 46.76: Poster

Thursday, March 29, 2007, 15:00–17:30, Poster A

Electrodeposited ZnO / tetrasulfophthalocyanatonickel (TSPcNi) films: An inorganic / organic hybrid system with infinitely variable composition — Cathrin Boeckler, Armin Feldhoff, and •Torsten Oekermann — Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstrasse 3-3A, 30167 Hannover, Germany

Electrodeposition is a low-cost and convenient method for the preparation of inorganic / organic hybrid materials for optoelectronic applications such as dye sensitized solar cells, in which high efficiencies were achieved with electrodeposited nanostructured ZnO / dye films [1]. ZnO / dye hybrid systems investigated so far were based on a ZnO framework, which became instable at higher dye concentrations. We now found that electrodeposited ZnO / TSPcNi hybrid films represent a system which can be infinitely varied in its content. With increasing dye concentration in the deposition bath, a transition from films based on crystalline ZnO, which appear green due to TSPcNi momomers, over blue films with dye dimers or aggregates to deep blue films based on an amorphous dye framework is observed. All films are highly transparent. The electrical and photoelectrical properties are dominated by the respective framework of each film. Consequently, films with a balanced composition show the lowest conductivity, while their photoconductivity is the highest, indicating that both phases take part in the transport of photogenerated electrons.

[1] T. Yoshida, M. Iwaya, H. Ando, T. Oekermann, K. Nonomura, D. Schlettwein, D. Wöhrle, H. Minoura, Chem. Commun. 2004, 400.