Abstract
We present evidence for the generation of free carriers in aggregated single-wall carbon nanotubes by photoexcitation in the energetic range of the transition associated with the saddle point of the graphene lattice. The underlying broad absorption culminating at 4.3 eV can be fit well with a Fano line shape that describes strong coupling of a saddle-point exciton to an underlying free electron-hole pair continuum. Moreover, it is demonstrated that transitions in this energetic region autoionize into the continuum by detecting features unique to the presence of free charges in the transient transmission spectra of the continuum-embedded second sub-band exciton, .
- Received 20 May 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.257402
© 2011 American Physical Society
Focus
Nanotube Bundles Show Promise for Solar Cells
Published 16 December 2011
Bundles of nearly identical carbon nanotubes have properties that are well-suited for making electricity from light.
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