Novel photoelectrochromic cells containing a polyaniline layer and a dye-sensitized nanocrystalline TiO2 photovoltaic cell

We present a novel photoelectrochromic (PEC) cell containing a polyaniline layer and a dye-sensitized nanocrystalline TiO2 layer. Electrochromic thin films of polyaniline layers have been prepared by electrochemical deposition and by spin-coating a dispersion of a polyaniline lacquer. The influences of the preparing parameters on the micromorphologies of the polyaniline layers were investigated. Under illumination of about one sunlight intensity, this self-powered PEC cell can modulate its transmission, averaged over the whole visible spectral region. The structure-property relations of the photoelectrochromic cells are discussed.