Near-infrared photoresponse in single walled carbon nanotube/polymer composite films

Details Near-infrared photoresponse in single walled carbon nanotube/polymer composite films Near-infrared photoresponse in single walled carbon nanotube/polymer composite films

2009-12-21

arxiv.org/abs/0912.4215v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

CARBON (in press)

Scientific paper

We present a near-infrared photoresponse study of single-walled carbon nanotube/poly(3-hexylthiophene)-block-polystyrene polymer (SWCNT/P3HT-b-PS) composite films for different loading ratios of SWCNT in the polymer matrix. Compared to the pure SWCNT film, the photoresponse [(light current - dark current)/dark current] is much larger in the SWCNT/polymer composite films. The photoresponse is up to 157% when SWCNTs are embedded in P3HT-b-PS while for a pure SWCNT film it is only 40%. We also show that the photocurrent strongly depends on the position of the laser spot with maximum photocurrent occurring at the metal-film interface. We explain the photoresponse due to exciton dissociations and charge carrier separation caused by a Schottky barrier at the metallic electrode - SWCNT interface

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