Abstract
In this work, we explored the properties of Barium Titanate (BaTiO3) for application in photoanodes. Unlike other works that used heterojunction, we developed a solar cell by combining Titanium Dioxide (TiO2) and BaTiO3 without sensitization. The increase of Voc in the cell with heterojunction may be explained with TiO2 acted as a blocking layer and as a charge acceptor from BaTiO3, improving the photovoltaic response of the cells, even without dye. For comparison, we developed a Dye-Sensitized Solar Cell (DSSC) by using Barium Titanate (BaTiO3) photoanodes with dye (N-3). The compounds used in the cells has been synthesized with: the microwave-assisted hydrothermal method for BaTiO3 and the Pechini method for TiO2. We use the techniques spin coating for TiO2 layer deposition and doctor blade for BaTiO3 layer. Typical features of a tetragonal structure were revealed by Raman and XAS spectroscopy, suggesting a non-centrosymmetric Ti atom in the TiO₆ octahedron. This result may generate localized states into the band gap. UV–vis absorption and photoluminescence indicate low recombination of the electron-hole pair. That may contribute to the photovoltaic behavior if associated with heterojunctions.
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