title: Fabrication and characterization of axially doped silicon nanowire tunnel field-effect transistors.
abstract: Tunnel field-effect transistors were fabricated from axially doped silicon nanowire p-n junctions grown via the vapor-liquid-solid method. Following dry thermal oxidation to form a gate dielectric shell, the nanowires have a p-n-n(+) doping profile with an abrupt n-n(+) junction, which was revealed by scanning capacitance microscopy. The lightly doped n-segment can be inverted to p(+) by modulating the top gate bias, thus forming an abrupt gated p(+)-n(+) junction. A band-to-band tunneling current flows through the electrostatically doped p(+)-n(+) junction when it is reverse biased. Current-voltage measurements performed from 375 down to 4.2 K show two different regimes of tunneling current at high and low temperatures, indicating that there are both direct band-to-band and trap-assisted tunneling paths.
authors.affiliation: Department of Electrical Engineering.
authors.forename: Aaron L
authors.initials: AL
authors.lastname: Vallett
authors.forename: Sharis
authors.initials: S
authors.lastname: Minassian
authors.forename: Phil
authors.initials: P
authors.lastname: Kaszuba
authors.forename: Suman
authors.initials: S
authors.lastname: Datta
authors.forename: Joan M
authors.initials: JM
authors.lastname: Redwing
authors.forename: Theresa S
authors.initials: TS
authors.lastname: Mayer