Bulk Heterojunction Photoelectrochemical Cells Consisting of Oxotitanyl Phthalocyanine Nanoporous Films and I3 -/I- Redox Couple

• Published in: The journal of physical chemistry. B 2006-11, Vol.110 (46), p.23321-23328
• Main Authors: Hoshino, Katsuyoshi, Hirasawa, Yusuke, Kim, Sang-Kook, Saji, Tetsuo, Katano, Jun-ichi
• Format: Article
• Language: English
• ISSN: 1520-6106; 1520-5207
• DOI: 10.1021/jp0644659

Photoelectrochemical cells based on oxotitanylphthalocyanine (TiOPc) films and an I3 -/I- redox couple have been constructed. The TiOPc films were prepared on an indium−tin oxide coated glass plate (ITO) by the micellar disruption method and characterized by their unique nanoporous structure. A photocurrent action spectrum for input radiation directed through the ITO/TiOPc film, film-thickness dependence, and morphological investigation revealed that the cells consisted of a bulk heterojunction formed between the nanoporous TiOPc films and the liquid I3 -/I- electrolyte, resulting in a larger short-circuit current (J sc = 2.1 mA/cm2), open-circuit voltage (V oc = 0.11 V), fill factor (ff = 0.31), and hence a larger energy conversion efficiency (η = 0.13% for an incident white-light intensity of 53 mW/cm2) than the bilayer structure composed of the vaccum-evaporated TiOPc compact film and the I3 -/I- electrolyte (J sc = 0.16 mA/cm2, V oc = 0.018 V, ff = 0.27, and η = (1.5 × 10-3)%).