TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition comprises (wt.%) the copolymer (5 - 20) based on N-methyl-2-pyrrolidone, and the titanium dioxide nanoparticles (10 - 30) based on the copolymer and has a viscosity of 35000 - 40000 cP. The composition further comprises iodine and an iodine compound supplying oxidizing and reducing ions. The amount of the copolymer added to the solvent is 5 - 20 wt.% of the solvent and that of the titanium dioxide nanoparticles added to the copolymer dissolved in the solvent is 10 - 30 wt.% of the copolymer. A weight ratio of the N-methyl-2-pyrrolidone, the copolymer and the titanium dioxide nanoparticles is 1:5 - 20:10 - 30. The cell further comprises the iodine and the iodine compound supplying oxidizing and reducing ions. Preferred Components: The iodine compound is 1-hexyl-2,3-dimethyl imidazolium iodide or lithium iodide. EXAMPLE - N-Methyl-2-pyrrolidone (NMP) and KynarFlex 2801 (RTM: a copolymer of vinylidene fluoride (PVDF) and hexafluoropropylene (HFP)) were mixed at a weight ratio of 85:15 to obtain a uniform transparent solution. PC-101 (RTM: titanium dioxide nanoparticles) (10 wt.%) were added to the transparent solution. The resultant solution which included the nanoparticles, the solvent and the copolymer, was then mechanically stirred. A predetermined amount of 1-hexyl-2,3-dimethyl imidazolium iodide to make the concentration of 1M with respect to the weight of the solvent was added to the resultant solution. 0.1 M Iodine was also added to the resultant solution and stirred to obtain a uniformly distributed electrolyte. The resultant slurry obtained after stirring the mixture had a viscosity of 35000 - 40000 cP. The slurry was then coated to a thickness of 10 micrometers over a photo-electrode formed of TiO2 nanoparticles, and an opposite electrode was placed over the resultant photo-electrode. For a comparison, dye-sensitized solar cells were prepared as above except that TiO2 nanoparticles were not added. For the evaluation of the electrical characteristics of the dye-sensitized solar cells, the test dye-sensitized solar cell was used as a test group, and the comparative solar cell was used. The test dye-sensitized solar cell had better electrical characteristics than the comparative dye-sensitized cell. It was found that the electrical characteristics improved as the quantity of the TiO2 nanoparticles added was increased.