Abstract
We report the subthreshold characteristics of ballistic carbon nanotube field effect transistors (CNTFETs) showing the complex band structure effect. The tunneling of carriers from source to drain through a looped complex band structure increases the subthreshold drain current, reducing the on–off current ratio. We find that nanoscale CNTFETs can perform better with a larger on–off current ratio and better subthreshold swing if the CNT has a larger band gap.
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