TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Layer: The porous oxide semiconductor layer is obtained by laminating a porous layer (b) containing titania nano rod having diameter of 5-30 nm, on another porous layer (a) containing oxide semiconductor nano particles with particle size of 1-5 nm. Further, another porous layer (c) containing semiconductor nano particles or oxide semiconductor nano rod with maximum diameter of 30 nm or more, is laminated on the porous layer (b). The layer thickness of the porous layer (a) is 0.5-5 microns, and the total thickness of layers (b,c) is 3-50 microns.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The aqueous solution further contains a long-chain alkyl group-containing halogenated quaternary ammonium salt as a cationic surface-active agent. The titanium organic compound is titanium alkoxide of formula: Ti(OR)4, where R is 1-6C alkyl. The organic amine is fatty amine or aliphatic amine.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: The hydrophobic block of the block copolymer is polyoxypropylene, and the hydrophilic block is polyoxyethylene. The block copolymer is preferably ternary block copolymer comprising polyoxyethylene polyoxypropylene polyoxyethylene. EXAMPLE - 10 wt.% aqueous solution of ternary block copolymer containing polyoxyethylene, polyoxypropylene and polyoxyethylene in ratio of 100-110:50-70:100-110 was prepared. Cetyl trimethyl ammonium bromide (in mol/L) (0.05) was added and stirred to obtain transparent aqueous solution. Ethylene diamine (0.2) and tetraisopropyl orthotitanate (0.22) were added to the aqueous solution, and stirred to obtain titania sol. The obtained titania sol was subjected to hydrothermal reaction at 160degreesC for 12 hours to obtain white liquid of titania nano rod. The obtained white liquid was filtered, water-washed and centrifuged to obtain titania nano rod. The obtained nano rod was used for forming oxide semiconductor layer of dye sensitized solar cell. The obtained solar cell had short circuit current density of 13.9 A/cm2, open-circuit voltage of 0.73V, and photoelectric conversion efficiency of 7.52%.