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Silicon nanowires, prepared by electroless chemical etching, are used to fabricate dual-gate field-effect transistors. The diameters of the nanowires vary from 40-300 nm, with a maximum aspect ratio of ~3000. Titanium silicide contacts are fabricated on single nanowires. An aluminium top-gate, combined with a back-gate, forms a dual-gate transistor. In an n-channel device with a nanowire diameter of ~70 nm, the output characteristics show current saturation, with a maximum current of ~100 nA. A drain-source threshold voltage exists for current flow, controlled by the gate voltage, and assists in device turn-off. The on/off current ratio is ~3000, and the subthreshold swing is ~780 mV/decade.
Date of Publication: Aug. 2010