A novel trichromophore amphiphilic dye N-methyl-2,4,6-tri-(4-dioctadecylamino)stilbazolium iodide (P(3)n) has been synthesized and successfully transferred on semiconducting transparent indium-tin oxide (ITO) electrodes by a Langmuir-Blodgett (LB) technique. Photocurrent generation was studied in a conventional photoelectrochemical cell. An action spectrum of the photocurrent generation is coincident with the absorption spectrum of the LB film-modified electrode, indicating that the dye aggregate in the LB film is responsible for the photocurrent. Some factors that may affect the observed photocurrent, such as the presence of O-2, the concentrations of methyl viologen (MV2+) and hydroquinone (H(2)Q), pH, and the bias voltage have been investigated. Models fur the mechanism of light-induced electron transfer under different conditions are proposed.