Quasi solid state dye-sensitized solar cells with modified TiO2 photoelectrodes and triphenylamine-based dye

✍ Scribed by G.D. Sharma; P. Suresh; John A. Mikroyannidis

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 543 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2009.11.101

✦ Synopsis

Quasi solid state dye-sensitized solar cells (DSSCs) have been fabricated with organic sol or TiCl 4 modified TiO 2 and porous TiO 2 photoanode and a triphenylamine-based dye (TPAR3) used as photosensitizer. Dark current measurements suggested that both modified TiO 2 photoelectrodes had significantly reduced the recombination rate of photoelectrons due to the reduced bare FTO surface in comparison to porous photoelectrode. The DSSC based on modified TiO 2 photoelectrodes showed improved photovoltaic parameters compared to the porous TiO 2 photoelectrode. The overall power conversion efficiency (PCE) is 3.27%, 4.73% and 6.8% for porous, TiCl 4 modified and sol modified TiO 2 photoelectrodes, respectively. The improved PCE with modified TiO 2 electrodes was attributed to the formation of a compact layer. This effectively improves adherence of TiO 2 to FTO surface, providing a larger TiO 2 /FTO contact area and reducing the electron recombination by blocking the direct contact between redox electrolyte and the conductive FTO surface and enhances the electron collection efficiency.