Open Access Nano Express

Femtosecond Dynamics in Single Wall Carbon Nanotube/Poly(3-Hexylthiophene) Composites

Emmanouil Lioudakis1*, Andreas Othonos1 and Ioannis Alexandrou2

Author Affiliations

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

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Nanoscale Research Letters 2008, 3:278-283  doi:10.1007/s11671-008-9149-x

Published: 29 July 2008

Abstract

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.

Keywords:
Ultrafast spectroscopy; Single wall carbon nanotubes; Exciton dissociation