Fullerene functionalized polystyrene (PSFu) with a variety of fullerene (C 60 ) contents was synthesized and characterized. The best PSFu was selected on the basis of solubility and band gap energy for application studies. Feasibility for using PSFu as a replacement of C 60 in bulk heterojunction (BHJ) polymer solar cells was explored. Performance of the BHJ cells containing PSFu was comparable to that of the cells containing neat C 60 , irrespective of the acceptor=donor weight ratios, even the actual amount of C 60 in PSFu molecules was (about 5 times) lower than that of the neat C 60 .
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