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.
Highlights
Femtosecond transient absorption measurements on single wall carbon nanotube/poly(3-hexylthiophene) composites are used to investigate the relaxation dynamics of this blended material
We have found that carrier relaxation within the valence and conduction bands of P3HT is beyond our resolution time (*150 fs) whereas the exciton dynamics have a double exponential relaxation
Based on the observed ultrafast relaxation we present a comparison of SWNTs and [6,6]-phenylC61butyric acid methyl ester (PCBM) as mixture materials in the P3HT polymer matrix for their photovoltaic performance
Summary
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 literature is lacking a comprehensive study of exciton and dissociated carrier (polarons and electrons) dynamics in these very promising composites for photovoltaic and optoelectronic applications.
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