Photogenerated Free Carrier Dynamics in Metal and Semiconductor Single-Walled Carbon Nanotube Films
2008; American Chemical Society; Volume: 8; Issue: 12 Linguagem: Inglês
10.1021/nl801913y
ISSN1530-6992
AutoresMatthew C. Beard, Jeffrey L. Blackburn, Michael J. Heben,
Tópico(s)Fullerene Chemistry and Applications
ResumoTime-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.
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