Double-walled carbon nanotubes-incorporated donor-acceptor-type organic photovoltaic devices using poly(3-octylthiophene) and C60

Donor-acceptor-type photovoltaic devices with a heterojunction between regioregular poly(3-octylthiophene) (P3OT) and C-60 are fabricated with and without the addition of double-walled carbon nanotubes (DWCNs) in the polymer layer. Incorporation of DWCNs in the polymer layer improves the performance of the device by many folds, which is attributable to improved exciton dissociation and better charge transport leading to the suppression of charge carrier recombination. We report an open-circuit voltage, short-circuit current density, fill factor and conversion efficiency (%) of approximately 0.37 V, 0.014 mA/cm(2), 0.22 and 0.001%, respectively, for an unoptimized device incorporating DWCNs.