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

Publication Year:
2008
Usage 545
Downloads 485
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Repository URL:
https://repository.upenn.edu/physics_papers/86
DOI:
10.1103/physrevb.78.155429.
Author(s):
Kinder, Jesse M.; Mele, Eugene J.
Tags:
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.