Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-05-02
Nano Letters, 8 (6), pp. 1596--1601, 2008.
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
17 pages, 5 figures
Scientific paper
10.1021/nl0801226
Optical emission from carbon nanotube transistors (CNTFETs) has recently attracted significant attention due to its potential applications. In this paper, we use a self-consistent numerical solution of the Boltzmann transport equation in the presence of both phonon and exciton scattering to present a detailed study of the operation of a partially suspended CNTFET light emitter, which has been discussed in a recent experiment. We determine the energy distribution of hot carriers in the CNTFET, and, as reported in the experiment, observe localized generation of excitons near the trench-substrate junction and an exponential increase in emission intensity with a linear increase in current versus gate voltage. We further provide detailed insight into device operation, and propose optimization schemes for efficient exciton generation; a deeper trench increases the generation efficiency, and use of high-k substrate oxides could lead to even larger enhancements.
Avouris Phaedon
Koswatta Siyuranga O.
Lundstrom Mark S.
Perebeinos Vasili
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