Multiple Exciton Generation in Single-Walled Carbon Nanotubes

Upon absorption of single photons, multiple excitons were generated and detected in semiconducting single-walled carbon nanotubes (SWNTs) using transient absorption spectroscopy. For (6,5) SWNTs, absorption of single photons with energies corresponding to three times the SWNT energy gap results in a...

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Bibliographic Details
Published in:Nano letters 2010-07, Vol.10 (7), p.2381-2386
Main Authors: Wang, Shujing, Khafizov, Marat, Tu, Xiaomin, Zheng, Ming, Krauss, Todd D
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electron states
Exact sciences and technology
Excitons and related phenomena
Fullerenes and related materials
Materials science
Nanoscale materials and structures: fabrication and characterization
Nanotubes
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
Visible and ultraviolet spectra
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Summary:Upon absorption of single photons, multiple excitons were generated and detected in semiconducting single-walled carbon nanotubes (SWNTs) using transient absorption spectroscopy. For (6,5) SWNTs, absorption of single photons with energies corresponding to three times the SWNT energy gap results in an exciton generation efficiency of 130% per photon. Our results suggest that the multiple exciton generation threshold in SWNTs can be close to the limit defined by energy conservation.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl100343j