New metal-free organic dye sensitizers containing mono-triphenylamine or bis-triphenylamine as the electron donor,a thiophene as the π-conjugated system,and a cyanoacrylic acid moiety as the electron acceptor were synthesized.The optical and electrochemical properties of the dyes were investigated,and their performance as sensitizers in solar cells was evaluated.Dye-sensitized solar cells based on dye containing bis-triphenylamine as the electron donor produced a photon-to-current conversion efficiency of 6.06％ (Jsc =14.21 mA/cm2,Voc =0.62 V,ff=0.69) under 100 mW/cm2 simulated AM 1.5 G solar irradiation (100 mW/cm2).