Abstract: Chlorophlla (Chla) was electrodeposited on SnO₂ optical transparent electrode from isooctane-chl a solution to form chl a/SnO₂ which was used as working electrode(WE)inthe photo electrochemical cell and another SnO₂ as counter electrode. The cell contained aqueous solution of dyes and triethanolamine (TEOA).As the light source,a 150W halogenlamp was used.The curves of working voltage vs working current were meaisured underthe potential of chl a/SnO₂ electrde controlled by means of a potentiostat. Accordingto the curves,open-circuit voltage (V_oc),short-circuit current (I_sc) and filling factoretc. were obtained.The change of photovoltage and photocurrent under illumination weremeasured.The output characters of photovoltage and photocurrent were obtained. Theresults indicated that Safranine T(ST) and halogenated fluorescein derivatives (FXn) hada great effect on the photoelectric parameters of the cells. The V_oc of the cell was about 6-8 times higher than that of the cells without ST and FXn.The increases of V_oc and I_sc were illustrated by the photoelectric effects of ST and chl a dihydrated aggregates andtheir absorption spectra. The mechanism of photoelectric effects was discussed throughthe output characters of photovoltages and photocurrents.

Key words: chlorophyll a, dyes, photoelectric effect