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

ORAL

Abstract

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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Authors

  • Biddut K. Sarker

    • University of Central Florida Nanoscience Technology Center and Dept. of Physics
    • Department of Physics \& Nanoscience Technology Center, University of Central Florida, Orlando, Florida 32826, USA.

  • M. Arif

    • Nanoscience Technology Center, University of Central Florida, Orlando, Florida 32826, USA.
    • Univ. of Central Florida, Nanoscience Technology Center and Dept. of Physics

  • Saiful I. Khondaker

    • University of Central Florida Nanoscience Technology Center and Dept. of Physics
    • Department of Physics \& Nanoscience Technology Center, University of Central Florida, Orlando, Florida 32826, USA.
    • Univ. of Central Florida, Nanoscience Technology Center and Dept. of Physics
    • University of Central Florida
    • University of Central Florida, Nanoscience Technology Center and Department of Physics
    • Univ.of Central Florida, Nanoscience Technology Center and Dept. of Physics