title: Remote p-doping of InAs nanowires.
abstract: We report on remote p-type doping of InAs nanowires by a p-doped InP shell grown epitaxially on the core nanowire. This approach addresses the challenge of obtaining quantitative control of doping levels in nanowires grown by the vapor-liquid-solid (VLS) mechanism. Remote doping of III-V nanowires is demonstrated here with the InAs/InP system. It is especially challenging to make p-type InAs wires because of Fermi level pinning around 0.1 eV above the conduction band. We demonstrate that shielding with a p-doped InP shell compensates for the built-in potential and donates free holes to the InAs core. Moreover, the off-current in field-effect devices can be reduced up to 6 orders of magnitude. The effect of shielding critically depends on the thickness of the InP capping layer and the dopant concentration in the shell.
authors.affiliation: Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands.
authors.forename: H-Y
authors.initials: HY
authors.lastname: Li
authors.forename: O
authors.initials: O
authors.lastname: Wunnicke
authors.forename: M T
authors.initials: MT
authors.lastname: Borgström
authors.forename: W G G
authors.initials: WG
authors.lastname: Immink
authors.forename: M H M
authors.initials: MH
authors.lastname: van Weert
authors.forename: M A
authors.initials: MA
authors.lastname: Verheijen
authors.forename: E P A M
authors.initials: EP
authors.lastname: Bakkers