Computational study of exciton generation in suspended carbon nanotube transistors.
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.
Koswatta
Siyuranga O
SO
Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906, USA. koswatta@purdue.edu
Perebeinos
Vasili
V
Lundstrom
Mark S
MS
Avouris
Phaedon
P
D003198:Computer Simulation; D017076:Computer-Aided Design; D008027:Light; D008956:Models, Chemical; D037742:Nanotubes, Carbon / Q000737:chemistry*; D014159:Transducers; D014173:Transistors, Electronic
D037742:Nanotubes, Carbon