title: Electrical properties of GaSb/InAsSb core/shell nanowires.
abstract: Temperature dependent electronic properties of GaSb/InAsSb core/shell and GaSb nanowires have been studied. Results from two-probe and four-probe measurements are compared to distinguish between extrinsic (contact-related) and intrinsic (nanowire) properties. It is found that a thin (2-3 nm) InAsSb shell allows low barrier charge carrier injection to the GaSb core, and that the presence of the shell also improves intrinsic nanowire mobility and conductance in comparison to bare GaSb nanowires. Maximum intrinsic field effect mobilities of 200 and 42 cm(2) Vs(-1) were extracted for the GaSb/InAsSb core/shell and bare-GaSb NWs at room temperature, respectively. The temperature-dependence of the mobility suggests that ionized impurity scattering is the dominant scattering mechanism in bare GaSb while phonon scattering dominates in core/shell nanowires. Top-gated field effect transistors were fabricated based on radial GaSb/InAsSb heterostructure nanowires with shell thicknesses in the range 5-7 nm. The fabricated devices exhibited ambipolar conduction, where the output current was studied as a function of AC gate voltage and frequency. Frequency doubling was experimentally demonstrated up to 20 kHz. The maximum operating frequency was limited by parasitic capacitance associated with the measurement chip geometry.
authors.affiliation: Solid State Physics, Lund University, SE-221 00 Lund, Sweden.
authors.forename: Bahram
authors.initials: B
authors.lastname: Ganjipour
authors.forename: Sobhan
authors.initials: S
authors.lastname: Sepehri
authors.forename: Anil W
authors.initials: AW
authors.lastname: Dey
authors.forename: Ofogh
authors.initials: O
authors.lastname: Tizno
authors.forename: B Mattias
authors.initials: BM
authors.lastname: Borg
authors.forename: Kimberly A
authors.initials: KA
authors.lastname: Dick
authors.forename: Lars
authors.initials: L
authors.lastname: Samuelson
authors.forename: Lars-Erik
authors.initials: LE
authors.lastname: Wernersson
authors.forename: Claes
authors.initials: C
authors.lastname: Thelander