Indian Journal of Engineering & Materials Sciences

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Simulation of the process variation in negative capacitance virtual-source carbon nanotubeFET devices and circuits


Affiliations
1 Department of Electronics and Communication Engineering, College of Engineering Guindy, Anna University, Chennai 600 025, Tamil Nadu, India
2 Department of Electronics and Communication Engineering, National Institute of Technology Delhi, Delhi 110 040, India

We have reported the impact of process variation of virtual- source carbon nanotube field-effect transistor (VS-CNFET) device externally connected to the epitaxial ferroelectric (FE) capacitor through the spectre parametric simulation. We have found that the FE materials with high remnant polarization produces better transfer characteristics and suppressed short channel effects (SCE). The increase in the ferroelectric thickness (tfe) has brought out the good impact of 4x improvement in ON current and reduced subthreshold swing of 40 mV/decade. The ON current has been increased with increase in thickness of ferroelectric material and has followed a monotonic trend, where the leakage current becomes a major concern and optimization of crucial parameters such as a diameter of the nanotube has given importance. Relative to the VS- CNFET model, the negative capacitance VS-CNFET model has stacked in ring oscillator (RO) displays immune to delay variation and produces better switching characteristics.
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  • Simulation of the process variation in negative capacitance virtual-source carbon nanotubeFET devices and circuits

Abstract Views: 147  | 

Authors

Bharathi Raj Muthu
Department of Electronics and Communication Engineering, College of Engineering Guindy, Anna University, Chennai 600 025, Tamil Nadu, India
Ewins Pon Pushpa Solomon
Department of Electronics and Communication Engineering, College of Engineering Guindy, Anna University, Chennai 600 025, Tamil Nadu, India
Vaithiyanathan Dhandapani
Department of Electronics and Communication Engineering, National Institute of Technology Delhi, Delhi 110 040, India

Abstract


We have reported the impact of process variation of virtual- source carbon nanotube field-effect transistor (VS-CNFET) device externally connected to the epitaxial ferroelectric (FE) capacitor through the spectre parametric simulation. We have found that the FE materials with high remnant polarization produces better transfer characteristics and suppressed short channel effects (SCE). The increase in the ferroelectric thickness (tfe) has brought out the good impact of 4x improvement in ON current and reduced subthreshold swing of 40 mV/decade. The ON current has been increased with increase in thickness of ferroelectric material and has followed a monotonic trend, where the leakage current becomes a major concern and optimization of crucial parameters such as a diameter of the nanotube has given importance. Relative to the VS- CNFET model, the negative capacitance VS-CNFET model has stacked in ring oscillator (RO) displays immune to delay variation and produces better switching characteristics.