We report here optical and electrochemical properties of a modified fullerene derivative, bis-F. It has two large 4-nitro- α -cyanostilbene moiety instead of ester methyl groups of bisPCBM. This replacement aimed to increase the absorption, enhance the solubility. bis-F shows higher solubility in common organic solvents and stronger absorption than PCBM in the range of 250~900nm like F. The LUMO energy level of bis-F is -3.73eV.