Photoconductivity Spectra of Single-Carbon Nanotubes: Implications on the Nature of Their Excited States
- 9 March 2005
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 5 (4), 749-752
- https://doi.org/10.1021/nl050227y
Abstract
We have measured the photoconductivity excitation spectra of individual semiconducting carbon nanotubes incorporated as the channel of field-effect transistors. In addition to the pronounced resonance that correlates with the second van Hove transition (E22) in semiconducting carbon nanotubes, a weaker sideband at about 200 meV higher energy is observed. Electronic structure calculations that include electron−phonon coupling indicate that the spectra originate from the simultaneous excitation of an exciton (main resonance) and a C−C bond stretching phonon (sideband). The spectral features are not compatible with an interband interpretation of the excitation involved.Keywords
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