EVALUATION OF BLOCKING LAYERS SENSITIZED SOLAR CELLS OF NANOSTRUCTURED TITANIUM OXIDE

Abstract

In conventional Grätzel cells, the conductive substrate (FTO) on the electrode, a mesoporous
TiO2 layer ~ um, prepared by the doctor blade method, with a heat treatment at 450 ° C,
the dye-sensitized deposited (D7). In this article an additional TiO2 layer between the FTO
and the electrode is added, because the electrode has a high porosity and don´t has a good
contact with the FTO, so we suggested adding a compact layer that helps transfer electron
of electrode to FTO and prevents direct contact between the FTO and electrolyte. Thus
electron recombination is prevented by the FTO hollow electrolyte. Subsequently certain
characterizations are performed to determine the thickness of the block and to analyze the
morphology of the electrode by Scanning Electron Microscopy. Finally the I-V curve was
we determined to analyze its efficiency with a radiation of 1000W/ m2 efficiency of 2,39%
was reached.