TECHNOLOGY FOCUS - ELECTRONICS - Preferred Method: At least one compound selected from the compounds (I) - (V), is adsorbed to the surface of the porous semiconductor by dipping in a solution having the compound dissolved in an organic solvent and evaporation. The thiophene-ring-containing compound contained in the electrolyte has a concentration of 0.01-1 mol/l or 1 mmol/l. The step of the adsorption of the thiophene-ring-containing compound is carried out by dipping the substrate having the porous semiconductor formed, into a solution having the organic compound dissolved in it, or coating the solution on the substrate; or allowing the substrate to stand in a container filled with the vapor of the thiophene-ring-containing compound. The manufacturing of the semiconductor electrode (E1) further involves forming an auxiliary electrode interconnection on the surface of the substrate having optical transparency, and forming the transparent conductive layer on the surface on which the auxiliary electrode interconnection has been formed.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The thiophene-ring containing compound is represented by the compound of formula (I) (preferably compounds of formulae (II) or (III), 3,4-ethylenedioxythiophene (IV), or benzo(b)thiophene (V)). The thiophene-ring-containing compound has a molecular weight of less than or equal to8000.R1 and R2 = H, 1-20C hydrocarbon, or 1-20C alkoxy;R3 and R4 = not defined. EXAMPLE - A gel as a precursor of titanium oxide was prepared using the process as described in Adachi et al., J. of Electrochemical Society, 151, 1653 (2004). The gel was applied on a glass substrate having a layer of fluorine-doped tin oxide. After application, the gel was dried at room temperature and baked in electric furnace at 450degreesC for 10 minutes. The application of gel, drying and baking steps were repeated until the layer thickness of titanium oxide reached 10 microns. A dye was adsorbed on the resulting thin layer of titanium oxide using a sensitizing dye N719 (RTM: cis-di(thiocyanato)-N,N'-bis(2,2'-bipyridyl-4,4'-dicarboxylic acid)-ruthenium (II)), by dipping the substrate in the ethanol solution of the dye. To the dye-adsorbed semiconductor electrode, 3,4-ethylenedioxythiophene (EDOT) was adsorbed in a solution of EDOT in acetonitrile (1 mol/l) by dipping the electrode in the solution and then allowed to stand at room temperature for 5 minutes, washed and dried in a dark place naturally to obtain the semiconductor electrode. A dye-sensitized solar cell was prepared using the semiconductor electrode. The properties of the cell, such as short-circuit current density, open circuit voltage and photovoltaic conversion efficiency were evaluated by exposing the cell to artificial sunlight at one sun illumination and air mass of 1.5 by using a solar simulator. It was observed that the cell showed following characteristics: short-circuit current density: 13.2 mA/cm2; open circuit voltage: 0.62 V; and photovoltaic conversion efficiency: 4.62%.