Photoelectrochemical Studies of Electrodes Coated with Merocyanine Dye

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Abstract
Deposited films of merocyanine dye (3‐carboxymethyl‐5‐[2‐(3‐octadecyl‐2‐benzothiazolinylidene)ethylidene]‐2‐thioxo‐4‐thiazolidinone) show various kinds of intra‐ and intermolecular changes when they are heated and/or soaked in a neutral aqueous solution. The effect of such changes on photocurrent has been examined using electrodes coated with the dye film. A remarkable high quantum efficiency (above 10%) for cathodic photocurrent has been obtained when the dye film shows red‐shifted absorption bands owing to the dye aggregation. The high photoactivity is attributable to the high transfering ability of excitons in the aggregates.

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