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Impact of Drain Underlap Length Variation on the DC and RF Performance of Cylindrical Gate Tunnel FET


Sidhartha Dash and Guru Prasad Mishra*   Pages 1 - 6 ( 6 )


Introduction: Here, we have presented an n-channel cylindrical gate tunnel FET with drain underlap engineering (CGT-DU) and the simulation process is carried out using 3-D device simulator from Synopsys.

Methods: The analog and radio frequency (RF) performance of the device has been studied extensively in terms of electric field, energy band analysis, drain current, gain bandwidth product, unity gain cut‐off frequency, transconductance frequency product, and maximum oscillation frequency for different values of drain underlap length.

Results: The increase in underlap length in CGT paves way for substantial reduction in ambipolar current without degrading the ON-state current. The proposed device exhibits lower lateral electric field, larger tunneling length and lower gate to drain capacitance at the drain end with higher underlap length.

Conclusion: CGT-DU exhibits superior ambipolar and RF performance without degrading ON-state current and threshold voltage.


CGT, Underlap length, Energy band analysis, Ambipolar current, ON-state current, RF analysis


Dept. of Electronics & Communication Engg., Institute of Technical Education & Research, Siksha 'O' Anusandhan deemed to be University, Bhubaneswar-751030, Dept. of Electronics & Telecommunication Engineering, National Institute of Technology Raipur, Raipur

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