Photoelectrochemical properties of merocyanine film electrode

• Published in: Nippon Kagakukai shi (1972) Vol. 1985; no. 12; pp. 2226 - 2230
• Main Authors: TAKAHASHI, Kohshin, KOMURA, Teruhisa, IMANAGA, Hiroto
• Format: Journal Article
• Language: English
• Published: Tokyo Japan Science and Technology Agency 1985
• ISSN: 0369-4577; 2185-0925
• DOI: 10.1246/nikkashi.1985.2226

The specific resistance of 3-ethyl-5-[(3-ethyl-2(3H)-benzothiazolylidene)ethylidene]-2thioxo-4-thiazolidinone film is 4.5×109Ωcm in the dark and 4.2×108Ωcm under illumination, respectively. The film, therefore, is intermediate between insulator and semiconductor, and slightly photoconductive. When the thick film of 500 nm on gold is illuminated in methylviologen, FeIII EDTA complex, quinone and [Fe(CN)6]3- aqueous solutions, cathodic photocurrent is obserbed in more positive potential than the reduction potential. Anodic photocurrent, on the other hand, is observed only in more positive potential than the Dxidation potential in FeII EDTA complex, hydroquinone and [Fe(CN)6]4- solutions. The thick film, therefore, is probably a p-type semiconductor with low carrier density and the Hatband potential of 0.4∼0.5 V vs. AgCl/Ag. When the thin film of 50 nm on gold is illuminated in quinhydrone solution, short circuit anodic photocurrent is observed. The anodic photocurrent can be attributed to dye-sensitized photoreaction because the thin film is not semiconductor.