TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The dye is ruthenium complex dye or mercurochrome dye. The ruthenium complex dye is N3 dye (cis-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylato)-ruthenium(II)), N712 dye (tetrakis(tert-butylamine)(ruthenium(bis(dicarboxybipyridine)isothiocyanato)) complex, N719 dye (cis-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylato)-ruthenium(II) bis-tetrabutylammonium), N749 dye (tri(isothiocyanato)-ruthenium(II)-2,2':6',6''-terpyridine-4,4',4''-tricarboxylic acid, tris-tetrabutylammonium salt), 470 dye (tris(2,2'-bipyridyl-4,4'-dicarboxylato)ruthenium(II) dichloride), 505 dye (cis-bis(cyanido)(2,2'-bipyridyl-4,4'-dicarboxylato)ruthenium(II)), or Z907 dye (cis-bis(isothiocyanato) (2,2'-bipyridyl-4,4'-dicarboxylato)(2,2'-bipyridyl-4,4'-di-nonyl)ruthenium(II). The weight ratio of the carbon black nanoparticles to the titanium dioxide nanoparticles is 1:100-1:10000. The transparent substrate is made of glass or plastic. The titanium alkoxide is titanium isopropoxide. The acid is nitric acid, hydrochloric acid or acetic acid. The dye layer has a material comprising ruthenium complex dye or mercurochrome dye. The cathode electrode is made of a material of platinum, gold, carbon, or an electrically conductive polymer including polypyrrole, polyaniline or polythiophene. The electrolyte layer is a liquid-, gel- or solid-state, and comprises an acetonitrile solution containing iodine, lithium iodide and 4-isobutyl pyridine. Preferred Method: The sol-gel reaction further comprises: performing a condensation reaction, to make the titanium alkoxide, the carbon black nanoparticles and the acid for forming a precursor mixed with the carbon black nanoparticles, and subjecting the precursor mixed with the carbon black nanoparticles to perform a high-temperature and high-pressure reaction to form the carbon black-mixed titanium dioxide sol-gel; performing a condensation reaction, to make the titanium alkoxide and the acid for forming a precursor, and adding the carbon black nanoparticles into the precursor and subjecting the precursor and the carbon black nanoparticles to perform a high temperature and high pressure reaction to form the carbon black-mixed titanium dioxide sol-gel; or performing a condensation reaction to make the titanium alkoxide and the acid for forming a precursor, subjecting the precursor to perform a high temperature and high pressure reaction to form a titanium dioxide sol-gel, and adding the carbon black nanoparticles into the titanium dioxide sol-gel to form the carbon black-mixed titanium dioxide sol-gel. In the method, the high-temperature and high-pressure reaction is performed at 180-240 degrees C in a closed system including an autoclave. In the method, the step of forming the dye layer is to perform a soaking step to soak the transparent substrate with the carbon black-mixed titanium dioxide layer in a dye solution. EXAMPLE - Carbon black-mixed titanium dioxide sol-gel was dispersed in ethanol solution (95 wt.%) to obtain a slurry with a solid content of 15 wt.%. The slurry was blade-coated on a transparent glass or plastic substrate having indium tin oxide and then the coated transparent substrate was placed and dried for 30 minutes. The coated transparent substrate was dried on a hot plate at 50 degrees C for 10 minutes to obtain the carbon black-mixed titanium dioxide membrane electrode. The membrane electrode was soaked into the ethanol solution of N719 dye (cis-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylato)-ruthenium(II) bis-tetrabutylammonium) (5x 10-4 M) for 12 hours, to form N719 dye layer on the carbon black-mixed titanium dioxide layer. The N719 dye absorbing membrane electrode was taken out, roughly rinsed with ethanol and dried, to obtain the anode electrode of the DSSC including the carbon black-mixed titanium dioxide layer and the N719 dye layer disposed on it.