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Optimization of single-gate carbon-nanotube field-effect transistors
Ungersboeck, E.,Pourfath, M.,Kosina, H.,Gehring, A.,Cheong, Byoung-Ho,Park, Wan-Jun,Selberherr, S. IEEE 2005 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.4 No.5
The performance of Schottky-barrier carbon-nanotube field-effect transistors (CNTFETs) critically depends on the device geometry. Asymmetric gate contacts, the drain and source contact thickness, and inhomogenous dielectrics above and below the nanotube influence the device operation. An optimizer has been used to extract geometries with steep subthreshold slope and high I<SUB>on</SUB>/I<SUB>off</SUB> ratio. It is found that the best performance improvements can be achieved using asymmetric gates centered above the source contact, where the optimum position and length of the gate contact varies with the oxide thickness. The main advantages of geometries with asymmetric gate contacts are the increased I<SUB>on</SUB>/I<SUB>off</SUB> ratio and the fact that the gate voltage required to attain minimum drain current is shifted toward zero, whereas symmetric geometries require V<SUB>g</SUB>=V<SUB>d</SUB>/2. Our results suggest that the subthreshold slope of single-gate CNTFETs scales linearly with the gate-oxide thickness and can be reduced by a factor of two reaching a value below 100 mV/dec for devices with oxide thicknesses smaller than 5 nm by geometry optimization.
M. HosseinpourRokni,R. Naderi,M. Soleimani,A.R. Jannat,M. Pourfath,M. Saybani 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
The electrochemical behavior of 5083 aluminum alloy in an alkaline solution in the absence and presenceof two green additives extracted from Mentha piperita L ‘MP’ and Lawsonia inermis ‘LI’ was analyzed inthis study. Corrosion-related investigations disclosed the mixed-type adsorptive function of the compounds,which reduced Al parasitic dissolutions and consequent H2 evolutions by about 80% at800 ppm of each additive. The performance made the Al alkaline corrosion more uniform, probably byremoving water molecules from the surface as approved by FE-SEM and EDS. Quantum calculations indicatedthe molecular adsorption type and the role of influencing functional groups, particularly =O and –COO(H,CH3) which were the most influencing. These results were also confirmed by FT-IR analysis. Theeffect of the additives on the dissolution of Al anode was investigated under different discharging rates,clarifying how the employed electrolyte containing the green extracts could improve Al anode capacitydensity by ~2.8 Ah/g and enhance the anode utilization efficiency by ~94% in an air battery. The resultsof this study can open the way for future investigations to replace the synthetic anti-corrosion additivesof Al air-batteries with non-toxic and biodegradable organic ones having similar corrosion inhibition performancewithout restricting anode discharge currents.