Nonradiative Recombination of Excitons in Carbon Nanotubes Mediated by Free Charge Carriers

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Kinder, J. M.
Mele, E. J.
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Free electrons or holes can mediate the nonradiative recombination of excitons in carbon nanotubes. Kinematic constraints arising from the quasi one-dimensional nature of excitons and charge carriers lead to a thermal activation barrier for the process. However, a model calculation suggests that the rate for recombination mediated by a free electron is the same order of magnitude as that of two-exciton recombination. Small amounts of doping may contribute to the short exciton lifetimes and low quantum yields observed in carbon nanotubes.
Comment: 18 pages, 4 figures. Submitted to Physical Review B
Keywords
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
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