The electrochemical and photoelectrochemical characteristics of conducting polymer bilayers composed by polypyrrole, PPy, and poly(3-methylthiophene), PMeT, are described. The bilayers were produced by galvanostatic deposition of the polymers using different charge densities. Scanning electron micrographs indicate that the sequence of polymerization affects the surface morphology of the bilayers and, while PMeT polymerizes into the pores of the PPy film, a PPy film is formed over the PMeT film. Cyclic voltammetry of the bilayers shows the peaks corresponding to PPy and PMeT, regardless of the sequence of deposition; however, the potentials of redox processes are slightly shifted. The sequence of polymer deposition also affects the photoelectrochemical properties of the bilayers. The results show that, for a bilayer with PMeT as inner polymer and PPy as outer polymer, an enhanced photocurrent can be obtained by controlling polymer film thickness.
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