Transport time studies in Titanium Dioxide sensitized Solar Cells doped with Aluminum (III).
Keywords:
TiO2 nanoparticles, solar cells, aluminum oxide, electron lifetime, electron transport timeAbstract
Grätzel-type nanocrystalline solar cells were prepared using films made from commercial titanium dioxide that was modified with aluminum oxide and sensitized with dye. The Al+3-modified TiO2 nanocrystalline films were obtained from a suspension of TiO2 containing a small amount of aluminum nitrate on a conductive glass substrate, followed by drying, compression, and finally sintering at 530°C. Electrodes prepared with the TiO2 nanoparticles with less than 0.3% by weight of aluminum oxide with respect to TiO2 improve the efficiency of the sensitized solar cell. This amount corresponds to less than a monolayer of aluminum oxide, the aluminum ions found on the surface of titanium dioxide affect the solar cell in different ways: they change the position of the conduction band potentials, increase the electron lifetime and make the electron transport time much slower due to the presence of the aluminum ions found between the Ti02 particles.
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