Abstract
The photoelectrochemical behavior of chlorophyll a and pheophytin a monolayers, deposited on tin oxide (SnO 2) optically transparent electrodes (OTE) by means of the Langmuir-Blodgett technique, has been investigated. The photocurrent action spectra coincide with the absorption spectra of photosynthetic pigment monolayers at the SnO 2/solution interfaces. Anodic and cathodic photocurrents were measured at various electrode potentials. Effects of electrolyte concentration, pH, electrode potentials, type of SnO 2 OTE and the nature of redox reagents on the magnitude of the photocurrent in solar energy conversion are discussed. A mechanism for the electron transfer in thin films of photosynthetic pigments in monolayers at the SnO 2 OTE is proposed. On the other hand, the absorption and fluorescence spectral characteristics, and fluorescence lifetime measurements of pheophytin a in monolayers and thin films are also discussed in view of the aggregation properties of the photosynthetic pigments.
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