Impact Excitation by Hot Carriers in Carbon Nanotubes

Abstract

We investigate theoretically the efficiency of intra-molecular hot carrier induced impact ionization and excitation processes in carbon nanotubes. The electron confinement and reduced screening lead to drastically enhanced excitation efficiencies over those in bulk materials. Strong excitonic coupling favors neutral excitations over ionization, while the impact mechanism populates a different set of states than that produced by photoexcitation. The excitation rate is strongly affected by optical phonon excitation and a simple scaling of the rate with the field strength and optical phonon temperature is obtained.

arXiv comment5 pages 4 figures

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• Multi-Band Mobility in Semiconducting Carbon Nanotubes
• Avalanche-Induced Current Enhancement in Semiconducting Carbon Nanotubes
• Ultrafast photocurrent measurement of the escape time of electrons and holes from carbon nanotube PN junction photodiodes
• Can impact excitation explain efficient carrier multiplication in carbon nanotube photodiodes?
• Tunable electronic correlation effects in nanotube-light interactions
• Multiple Exciton Generation in Chiral Carbon Nanotubes: Density Functional Theory Based Computation
• Singlet Fission in Chiral Carbon Nanotubes: Density Functional Theory Based Computation
• Ballistic and resonant negative photocurrents in semiconducting carbon nanotubes
• Computational study of exciton generation in suspended carbon nanotube transistors
• Trion-based High-speed Electroluminescence from Semiconducting Carbon Nanotube Films