NOVELTY - Polynuclear aromatic hydrocarbon photosensitive material, is claimed. The polynuclear aromatic hydrocarbon photosensitive material is naphthalenyl compound (I), tetracene and/or perylene or their geometrical isomers. The polynuclear aromatic hydrocarbon photosensitive material is the aromatic component separated from the heavy oil raw material. The separating method comprises precipitating the heavy oil raw material by using n-heptane into first four aromatic components and qualitatively separating them by liquid chromatography.    USE - Polynuclear aromatic hydrocarbon photosensitive material is useful for preparing dye-sensitized solar cell (claimed).    ADVANTAGE - The polynuclear aromatic hydrocarbon photosensitive material has good light, heat and chemical stabilities, strong characteristic electronic absorption spectrum in the visible region (450 nm), wide spectral response, high molar extinction coefficient and a photoelectric conversion efficiency of 0.15%.    DETAILED DESCRIPTION - Polynuclear aromatic hydrocarbon photosensitive material, is claimed. The polynuclear aromatic hydrocarbon photosensitive material is naphthalenyl compound of formula (I), tetracene and/or perylene or their geometrical isomers. The polynuclear aromatic hydrocarbon photosensitive material is the aromatic component separated from the heavy oil raw material. The separating method comprises precipitating the heavy oil raw material by using n-heptane into first four aromatic components and qualitatively separating them by liquid chromatography, preparing oxide or silica gel type column as stationary phase, pre-treating, adding the aromatic hydrocarbon and alcohol mobile phase respectively, where the size of the stationary phase is 40-200 meshes, temperature is 50-70 degrees C and the pressure is 0.1-0.15 MP, carrying out chromatographic separation at a flow rate of 3-3.5 ml/minute to obtain monocyclic aromatic components, bicyclic-aromatic components and polycyclic aromatic components. The separated polycyclic aromatic component is regarded as the photosensitive dye and is combined with the optical anode and cathode and electrolyte to form the dye-sensitized solar cell.    R1, R2, R3 = = H or 1-4C alkyl;    R4 = benzen-1,2-diyl, naphthalen-1,2-diyl, 5-methylnaphthalen-1,2-diyl or 6-methylnaphthalen-1,2-diyl;    R5 = naphthalen-1,2-diyl, 6-methylnaphthalene-1,2-diyl, 7-methylnaphthalene-1,2-diyl or 5-methylnaphthalene-1,2-diyl; and    R6 = benzen-1,2-diyl or 4-methyl benzen-1,2-diyl.    An INDEPENDENT CLAIM is also included for an use of polynuclear aromatic hydrocarbon photosensitive material as a sensitizing agent in the preparation of the dye-sensitized solar cell comprising a transparent substrate layer, a conductive layer, a light absorption layer, an electrolyte layer and a counter electrode and light absorption layer comprising a semiconductor nano particle layer and a dye layer modulator.