Improved double-gate armchair silicene nanoribbon field-effect-transistor at large transport bandgap. (7th December 2015)

• Record Type: Journal Article
• Authors: Mahmoudi, Mohsen; Ahangari, Zahra; Fathipour, Morteza
• Is Part Of: Chinese physics B. Volume 25:Number 1(2016)
• Publication Date: 2015-12-07
• Subjects: 85.30.Tv -- 73.61.Ga -- 73.20.–r -- 31.15.aq; silicene -- double-gate field-effect-transistor -- non-equilibrium Green's function -- tight binding; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1674-1056/25/1/018501
• Languages: English
• ISSNs: 1674-1056

Abstract

Abstract: The electrical characteristics of a double-gate armchair silicene nanoribbon field-effect-transistor (DG ASiNR FET) are thoroughly investigated by using a ballistic quantum transport model based on non-equilibrium Green's function (NEGF) approach self-consistently coupled with a three-dimensional (3D) Poisson equation. We evaluate the influence of variation in uniaxial tensile strain, ribbon temperature and oxide thickness on the on-off current ratio, subthreshold swing, transconductance and the delay time of a 12-nm-length ultranarrow ASiNR FET. A novel two-parameter strain magnitude and temperature-dependent model is presented for designing an optimized device possessing balanced amelioration of all the electrical parameters. We demonstrate that employing HfO2 as the gate insulator can be a favorable choice and simultaneous use of it with proper combination of temperature and strain magnitude can achieve better device performance. Furthermore, a general model power (GMP) is derived which explicitly provides the electron effective mass as a function of the bandgap of a hydrogen passivated ASiNR under strain.