Thermal Radiation from Metallic Single Walled Carbon Nanotubes of Different Shapes

Abstract

We have considered two terminal devices for the study of electroluminescence from the conducting channels of metallic single walled carbon nanotubes of different size and shapes under the influence of the single vacancy defect and the single walled defect. The metallic carbon nanotubes which were considered for the study the restriction of gapless armchair nanotubes were used. We have considered electron transport in the ballistic regime without electron-phonon interaction. It was found suitable when the length of the conducting channel was smaller than the electron mean free path of metallic single walled carbon nanotube. By turning off the applied bias in the device, we have studied the thermal radiation from perfect and defected carbon nanotubes. We have studied electroluminescence and thermal radiation from metallic armchair single walled carbon nanotubes having defects in the ballistic transport regime based on tight binding method. It was found that single vacancy defect and Stone-Wales defect have enhanced the electroluminescence which increased exponentially in the low bias range, while for the perfect nanotube only thermal radiation contributed and the electroluminescence was neglected. The strong radiation due to transition between high energy bands became dominant. Due to confinement of thermal excitation in the transverse direction, the intensity of the thermal radiation was independent of the nanotube diameter. We have studied the thermal radiation of perfect and carbon nanotubes with different defects. The obtained results were found in good agreement with previously obtained results.