NOVELTY - Triphenylamine organic dye i.e. (E)-2-Cyano-3-(4-((E)-2-(4-diphenylamino-phenyl)-vinyl)-2-methoxy-phenyl)-acrylic acid (I) is new.    USE - (I) is useful as a sensitizer for the liquid dye-sensitized solar cell (claimed).    ADVANTAGE - (I) exhibit reduced aggregation, enhanced light harvesting ability and improved utilization efficiency of visible light, and produces absorption spectrum with red shift and broadening effect.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) preparing (I);    (2) manufacturing a liquid dye-sensitized solar cell, comprising (i) cutting conductive glass in a rectangle shape with a dimension of 1.8x 1.5 cm, ultrasonically cleaning the conductive glass using deionized water, ethanol, isopropanol, acetone and further deionized water, drying the glass, coating titanium dioxide slurry on the conductive glass using screen printing method, repeating the coating for 6 times to obtain a titanium dioxide film with a thickness of 12 mu m, sintering the prepared titanium dioxide film in a tubular furnace at 500 degrees for 60 minutes, immersing the sintered titanium dioxide film in 40 mM titanium tetrachloride, heating the film at 70 degrees C for 30 minutes, washing the film with deionized water, sintering the film again in the tubular furnace at 500 degrees C for 60 minutes, cooling the film to 70 degrees C, immersing the cooled titanium dioxide film in a solution of 2x 10-4 mol/l (I) in ethanol for 24 hours, and washing the film using anhydrous ethanol and drying it to obtain photoelectrode, (ii) coating chloromolybdic acid solution on surface of a transparent conductive glass using screen printing method, sintering the glass in the tube furnace at 500 degrees C for 30 minutes, and cooling the glass to obtain counter electrode, and (iii) adding 2-3 drops of the electrolytic solution into the titanium dioxide film of the photoelectrode, assembling molybdenum electrode downwardly with the photoelectrode, slightly staggering the two glass electrodes for testing, and pressing hardly with a clip for sandwiching two electrodes and to obtain the cell assembly; and    (3) the liquid dye-sensitized solar cell manufactured by the above method, comprising the photoelectrode, electrolyte and the counter electrode.