Aggregation and the photoelectric behavior of tetrasulfonated phthalocyanine adsorbed on a TiO2 microporous electrode

Absorption spectroscopy of tetrasulfonated Zn, Co, Ga, In, TiO and metal-free phthalocyanine on a transparent titanium dioxide film electrode, which is made up of interconnected particles and pores characterized by scanning electron microscopy, has been reported. The chemical modification of the TiO2 microporous electrode with tetrasulfonated phthalocyanine (MTsPc) extends its absorbance into the visible region. The tetrasulfonated phthalocyanine mainly exists as the dimer on the TiO2 microporous electrode. The photocurrent action spectroscopy shows that only the absorbance of the MTsPc monomer contributes to the photocurrent while that of the MTsPe dimer does not generate a photocurrent.