The Effect of Substrate Temperature on the Spray-Deposited TiO2 Nanostructured Films for Dye-Sensitized Solar Cells
Abstract:The nanostructured TiO2 films have deposited on SnO2:F (FTO) coated glass substrate by spray pyrolysis technique at different substrate temperatures of 200–500 °C. The structural, surface morphological and optical properties of TiO2 films significantly vary with the substrate temperature. The surface of the TiO2 films deposited at 400 °C shows the nanoflakes and short nanorods (∼130 nm) like structures while the TiO2 films prepared at 500 °C shows only the nanoflakes like structures. The band gap of the TiO2 films prepared at higher temperatures (300–500 °C) becomes narrow due to presence the rutile phases in their crystal structure. Ruthenium (II) complex as a dye, KI/I2 as an electrolyte and carbon on FTO glass as a counter electrode has used to fabricate the dye-sensitized solar cell (DSC). The TiO2 film deposited at 400 °C has showed the best photovoltaic performance in DSC with the efficiency of 3.81%, the photovoltage of 773 mV, the photocurrent of 8.34 mA/cm2, and the fill factor of 56.17%. The photovoltage of the DSC increases with the increase of substrate temperature during the deposition of TiO2 films. Moreover, all the DSCs exhibit reasonably high fill factor value.
Document Type: Research Article
Publication date: April 1, 2011
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