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Nano Lett. 2008 Dec;8(12):4238-42. doi: 10.1021/nl801913y.

Photogenerated free carrier dynamics in metal and semiconductor single-walled carbon nanotube films.

Author information

1
National Renewable Energy Laboratory, Golden, Colorado 80401, USA. matt_beard@nrel.gov

Abstract

Time-resolved THz spectroscopy (TRTS) is employed to study the photogenerated charge-carrier dynamics in transparent films of single-walled carbon nanotubes (SWNTs). Two films were investigated: a film with 94% semiconducting-type tubes (s-SWNTs) and a film with only 7% s-SWNT and 93% metal-type tubes (m-SWNTs). We conclude that charge-carriers are generated with >60% yields at low light intensities in both films. Free-carriers are generated by a linear exciton dissociation process that occurs within -1 ps and is independent of excitation wavelength or tube type.

PMID:
19367928
DOI:
10.1021/nl801913y

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