STUDY OF THE PHOTOELECTROCHEMICAL PROPERTIES OF POLY(AZO-BISMARCK BROWN R) OBTAINED BY ELECTROPOLYMERIZATION FOR SENSITIZATION OF SOLAR CELLS

Abstract

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 detailed investigation of its photoelectrochemical properties. A decrease in eletrical resistance was observed when light was induced on the polymer membrane indicating charge transfer to the polymer conduction band. Thus, photo-responsive film of Bismarck Brown can be developed for advanced organic photovoltaic such as solar cells.