Abstract
A photoelectric conversion film consisting of sandwich-type tetracadmium(II) tungstophosphorate [P2W18Cd4(H2O)2O68]10− (P2W18Cd4) and a bichromophore hemicyanine of (E)-1,1′-(hexane-1,6-diyl)bis(4-((E)-2-(4-(dimethylamino)naphthalen-1-yl)vinyl)pyridinium) bromide (N6) was prepared by electrostatic self-assembly technique, and characterized by UV–vis spectroscopy, cyclic voltammetry and photoelectrochemistry. The UV–visible spectra showed that the film was uniformly deposited and N6 molecules formed J-aggregations in the films. The cyclic voltammetry showed that the P2W18Cd4 and N6 in the films were electrochemically active with surface-confined characteristics. As irradiated with white light, the (P2W18Cd4/N6) monolayer film gave stable cathodic photocurrent that is 2.4- and 6.7-fold as great as electrostatically self-assembled monolayer film of (P2W18Cd4/H6) {H6=(E)-1,1′-(hexane-1,6-diyl)bis(4-(4-(dimethylamino)styryl)pyridinium) bromide} and Langmuir–Blodgett monolayer film of analogous hemicyanine (E)-4-(2-(4-(dimethylamino)naphthalen-1-yl)vinyl)-1-octadecylpyridinium iodide. The photocurrent action spectrum indicated that the cathodic photocurrent was generated based on charge transfer excitation of the N6 in the film. The effects of applied bias voltages, electron acceptor, and layer numbers of the (P2W18Cd4/N6)n films on photocurrent generation of (P2W18Cd4/N6)n film were examined.
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