EFFECT OF DRYING CONDITION AND THICKNESS OF TO2 ELECTRODE ON PHOTOVOLTAC PERFORMANCE OF DYE SENSTIZED SOLAR CELL

Dye sensitized solar cells (DSSC) are based on adsorbtion of photon by dye and transfer it to TiO2 electrodes. The microstructure and defects of TiO2 electrodes are vital for fabrication of high efficiency dye sensitized solar cells. These properties strongly related to TiO2 electrode fabrication method and its parameters. In this research the effect of drying condition and thickness of the nanocrystalline TiO2 electrodes were investigated. Nanocrystalline TiO2 thin films with different thicknesses have been deposited on FTO coated glass substrates by a tape casting method, then these electrodes dried at different temperature (130°C and 70°C) by different speed. After that, these electrodes immersed into a dye solution. Then cell assembled by dye-covered TiO2 electrode and platinum coated FTO and Iodine electrolyte. The samples were characterized by SEM, TGAFTIR, OM and the cell performance was measured by solar light simulator at an intensity of 1000 W.m . Drying the electrodes at different temperature and different speed showed that solar cell with a TiO, electrode dried at 130 and lower speed gave higher short-circuit current density and open circuit voltage and the higher overall conversion efficiency of 5.1%. The effect of thickness of TiO2 film on parameters of DSSCs also was investigated and results showed that by increasing thickness of TiO2 films, adsorption of the N719 dye through TiO2 layers increased to optimum level and power conversion efficiency (n) of 7.51% was obtained.Keywords:

Keywords:

dye sensitized solar cells , Titanium dioxide electrodes , Nano titana , FTO , Platinum electrode