State selective electron injection in non-aggregated titanium phthalocyanine sensitised nanocrystalline TiO2 films.

We describe a novel titanium phthalocyanine that shows no aggregation when anchored to nanocrystalline TiO2 films through its axial carboxylated ligand without the use of co-adsorbents; state selective electron injection into the TiO2 is demonstrated, resulting in efficient photocurrent generation in dye sensitised photoelectrochemical solar cells. Copyright 2004 The Royal Society of Chemistry