Carrier control and transport modulation in GaSb/InAsSb core/shell nanowires

Summary, in English

We report transport studies of GaSb/InAs core/shell nanowires. It is shown that with increasing InAs shell thickness, it is possible to tune the carrier concentrations and transport in the structures from p-type (core-dominated) to n-type (shell dominated). For nanowires with an intermediate shell thickness (5-7 nm), we show that the transport is ambipolar, such that an applied top-gate potential can provide further control of carrier type and transport path. In this range, the nature of the GaSb-InAs junction also changes from broken gap (semimetal) to staggered (narrow bandgap) with a small decrease in shell thickness. From a device point of view, we demonstrate that the presence of a thin (<3 nm) InAs shell improves p-type GaSb nanowire transistor characteristics. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4749283]

• Author: Bahram Ganjipour; Martin Ek; Mattias Borg; Kimberly Dick Thelander; Mats-Erik Pistol; Lars-Erik Wernersson; Claes Thelander
• Department/s: Solid State Physics; Centre for Analysis and Synthesis; Department of Electrical and Information Technology; NanoLund: Centre for Nanoscience
• Publishing year: 2012
• Language: English
• Publication/Series: Applied Physics Letters
• Volume: 101
• Issue: 10
• Links: http://dx.doi.org/10.1063/1.4749283
• Document type: Journal article
• Publisher: American Institute of Physics (AIP)
• Topic: Condensed Matter Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0003-6951