Dye-sensitized solar cells (DSSCs) have attracted great interest as potential candidates of “low cost solar cells” in the solution of global energy demand. Typical DSSCs consist of a dyed semiconductor TiO2 photo-electrode, a counter electrode and a redox electrolyte. Dye sensitized oxide semiconductors(as TiO2, SnO2 and ZnO) are often used as porous photo-electrodes. If the used materials in photo-electrodes are of nano-scale particles or fibers, a porous structure will be obtained. Depend on the number of pores, the actual surface area will become more than the apparent surface area. In this case, the amounts of adsorbed dyes increase and the increasing in light absorption will result consequently. In the various researches it has been said that the photo-electrodes will be dyed after layer adsorption. Meaning the dying process will be done after all of the photo-electrodes adsorbed on the layers of a material. In this work, during nano-electrospinning, using Titanium-isopropoxide and also choosing a valid polymer with the spinning capability, a Titanium-dioxide/ poly-vinyl pyrrolidine composite nanofibers were produced during nano-electrospinning process. Moreover, the colored Titanium-dioxide composite nanofibers were obtained using ceramic dyes. Finally, the optimized conditions for maximum dye-absorption in nanofibers were analyzed. To evaluate the effect of ceramic dyes on the electrical conductivity of nanofibers, electrical conductivity of colored and uncolored nanofibers was measured. Statistical test results showed no significant difference. Then titanium dioxide nanofibers in red and black, no color was obtained with removing the PVP polymer by heating process. Comparison of FTIR spectra of composite nanofibers TiO2/PVP and nanofibers TiO2 showned that polymer have removed. Using these kinds of nanofibers, colored and uncolored Titanium-dioxide nano-rods were produced in order to be used in dye-sensitized solar photo-electrode cells. We believe that simple energy-efficient approaches such as the present one to fabricate TiO2 NR-based DSSCs would help in their commercialization at low-cost. The results showed the highest efficiency of a kind of dye-sensitized solar cells produced by Titanium-dioxide composite nanofibers. The value of efficiency for these solar cells calculated as 2.99. Key words : dye sensitized solar cell, electrospinning, nano-rod, titanium dioxide.
