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

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Kinder, Jesse M.; Mele, Eugene J.
Physical Sciences and Mathematics; Physics
article description
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 of 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.