Effect of Titanium Dioxide (TiO2) Light Scattering Layer deposited by Spray Deposition Method at Room Temperature for Dye-sensitized Solar Cell (DSSC)

Abstract

Abstract TiO2 light scattering layer was prepared form TiO2 (Degussa P25) colloidal solution of 0.75% by Wt. by spray coating machine under O2 gas. The conditions were varied with pulse spray at 5, 10, 15 and 20 times under substrate rotation deposited on the nano-porous TiO2/FTO substrate. The TiO2 working electrodes were sintered at 500°C for 1 hour and lead to immersed in dye sensitizer for 24 hours. Morphological, structural and optical properties were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-vis spectrophotometer, respectively. DSSC cells were fabricated by the TiO2 working electrodes sandwich with the Pt counter electrode. Photo-conversion efficiency of DSSC cells were compared between the standard cells which non-TiO2 scattering layer and the TiO2 scattering layer by solar simulator (AM 1.5). Structural characteristic exhibits crystalline of anatase phase TiO2 plane (101). Surface morphology is beginning uniform distribution when the pulses spray since to 15 times and obtains nano-microparticles sizes. Moreover, thickness of TiO2 light scattering layer and TiO2 working electrodes have approximately of 1 to 1.5 µm and 10 to 20 µm. Transmittances spectra of have lower 50%. Reflections spectra have lower of 50% and absorbance can be absorbed of 1 to 2% show that low transmittance, low reflection and low absorption in visible light which occur light scattering effect in TiO2 scattering layer well. The efficiency can be highest obtains which consists of the open circuit voltage (Voc), the current density (Jsc), fill factor.