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[60]PCB-C₄ is a conducting polymer, which can be used in a variety of applications such as organic photovoltaic cells (OPVs) and bulk heterojunction (BHJ) solar cells.

[6,6]-Phenyl-C₆₁?butyric acid butyl ester ([60]PCB-C₄) is a fullerene derivative that is used as an acceptor molecule with good field effect mobility in organic electronics. It has a structural similarity to PCBM based fullerene and its aliphatic groups facilitate an increase in its solubility.