Hetro-Dielectric (HD) Oxide-Engineered Junctionless Double Gate all around (DGAA) Nanotube Field Effect Transistor (FET)

This paper proposed Hetero-Dielectric (HD) Oxide-Engineered Junctionless double gate all around nanotube (DGAA-NT) FET for performance enhancement in low power circuits. In HD configuration, hafnium based high-k dielectric (HfO₂ and Hf_xTi_1-xO₂) as gate oxide (for inner as well as outer gate oxide) is introduced on source side and SiO₂ on drain side of HD JL-DGAA-NT FET. The tunnelling width and source-to-channel barrier height are significantly increased in the HD-JL-DGAA-NT FET as compared JL-DGAA-NT FET, causes the reduction in leakage current an order of 10⁻¹⁴ to 10⁻¹⁷ and I_ON/I_OFF ratio increased by 54%. It has been observed that side spacer with suitable dielectric constant can be considered to improve the performance of device. Further, Subthreshold slope (SS) and DIBL and I_ON/I_OFF current ratio has shown tremendous improvement on reducing channel thickness from 10 nm to 8 nm. It has been found that in HD-JL-DGAA-NT FET provides 25% and 57% improvement in SS and DIBL respectively. Therefore, HD-JL-DGAA-NT FET with adequate design parameters and dielectric material may be used for future digital applications.