The present research investigates the electrochemical behavior of a solar cell sensitized with Bismark Brown R azopolymer. This cell was developed from the electropolymerization of the dye on a conductive glass substrate coated with fluorine-doped tin oxide(FTO) by cyclic voltammetry. The photosensitive behavior of the obtained film was analyzed by cyclic voltammetry and chronoamperometry in the presence of pulsed light. The poly(azo-Bismarck R) exhibited reversible light-induced changes of electrical conductance, due to azo group photoisomerization. Electrochemical impedance spectroscopy was also carried out under a light source. This technique allowed to evaluate interfacial phenomena existing in the photovoltaic device, performing a Recebido em: 27/08/2018Aprovado em: 16/09/2018 52Colloquium Exactarum, v. 10, n.3,Jul-Set. 2018, p.51–65. DOI: 10.5747/ce.2018.v10.n3.e245detailed investigationof its photoelectrochemical properties. A decrease in electrical resistance was observed with the lightincidence on the polymer membrane indicating charge transfer to the polymer conduction band.Photo-responsive film of Bismarck Brown can be developed for advanced organic photovoltaic such as solar cells.