The aggregation behavior of zinc-tetracarboxy-phthalocyanine and its spectral sensitization on titanium dioxide films

Abstract

The aggregation state of 2,9,16,23-tetracarboxy-zinc-phthalocyanine (ZnTCPc) in aqueous, non-aqueous and micellar systems was analyzed in correlation to its photochemical behavior. Titanium dioxide (TiO2) electrodes coated with ZnTCPc exhibit photocurrent action spectra similar to the absorption spectra, indicating the presence of different aggregation species. The monochromatic photon-to-current generation efficiency presents its maximum value where the presence of monomers is predominant.