Femtosecond Dynamics in Single Wall Carbon Nanotube/Poly(3-Hexylthiophene) Composites
1 Department of Physics, Research Center of Ultrafast Science, University of Cyprus, P.O. Box 20537, 1678, Nicosia, Cyprus
2 Electrical Engineering and Electronics, University of Liverpool, Liverpool, L69 3GJ, UK
Nanoscale Research Letters 2008, 3:278-283 doi:10.1007/s11671-008-9149-xPublished: 29 July 2008
Femtosecond transient absorption measurements on single wall carbon nanotube/poly(3-hexylthiophene) composites are used to investigate the relaxation dynamics of this blended material. The influence of the addition of nanotubes in polymer matrix on the ultrashort relaxation dynamics is examined in detail. The introduction of nanotube/polymer heterojunctions enhances the exciton dissociation and quenches the radiative recombination of composites. The relaxation dynamics of these composites are compared with the fullerene derivative-polymer composites with the same matrix. These results provide explanation to the observed photovoltaic performance of two types of composites.