Efficient near-IR sensitization of nanocrystalline TiO2 films by zinc and aluminum phthalocyanines

✍ Scribed by MD. K. Nazeeruddin; R. Humphry-Baker; M. Grätzel; D. Wöhrle; G. Schnurpfeil; G. Schneider; A. Hirth; N. Trombach

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 88 KB
• Volume: 03
• Category: Article
• ISSN: 1088-4246
• DOI: 10.1002/(sici)1099-1409(199903)3:3<230::aid-jpp127>3.0.co;2-l

✦ Synopsis

Several zinc(II) and aluminum(III) phthalocyanines substituted by carboxylic acid and sulfonic acid groups were anchored to nanocrystalline TiO ~2~ films. By irradiation with visible light the photovoltaic behavior of the electrodes containing LiI / LiI ~3~/propylene carbonate electrolyte was measured. Most efficient results were found using zinc(II) 2,9,16,23-tetracarboxyphthalocyanine, with a current conversion efficiency at 700 nm approaching 45%. It is shown that electron injection into TiO ~2~ occurs from the excited singlet state of the phthalocyanine derivatives. High stability of the cell performance under continuous irradiation was found.