title: Silver as Seed-Particle Material for GaAs Nanowires--Dictating Crystal Phase and Growth Direction by Substrate Orientation.
abstract: Here we investigate the feasibility of silver as seed-particle material to synthesize GaAs nanowires and show that both crystal phase and growth direction can be controlled by choice of substrate orientation. A (111)B substrate orientation can be used to form vertically aligned wurtzite GaAs nanowires and a (100) substrate orientation to form vertically aligned zinc blende GaAs nanowires. A 45-50% yield of vertical nanowire growth is achieved on the (100) substrate orientation without employing any type of surface modification or nucleation strategy to promote a vertical growth direction. In addition, photoluminescence measurements reveal that the photon emission from the silver seeded wurtzite GaAs nanowires is characterized by a single and narrow emission peak at 1.52 eV.
authors.affiliation: Center for Quantum Devices & Nano-Science Center, Niels Bohr Institute, University of Copenhagen , Nørregade 10, 1165 København, Denmark.
authors.forename: Caroline
authors.initials: C
authors.lastname: Lindberg
authors.affiliation: Center for Quantum Devices & Nano-Science Center, Niels Bohr Institute, University of Copenhagen , Nørregade 10, 1165 København, Denmark.
authors.forename: Alexander
authors.initials: A
authors.lastname: Whiticar
authors.forename: Kimberly A
authors.initials: KA
authors.lastname: Dick
authors.forename: Niklas
authors.initials: N
authors.lastname: Sköld
authors.affiliation: Center for Quantum Devices & Nano-Science Center, Niels Bohr Institute, University of Copenhagen , Nørregade 10, 1165 København, Denmark.
authors.forename: Jesper
authors.initials: J
authors.lastname: Nygård
authors.affiliation: Center for Quantum Devices & Nano-Science Center, Niels Bohr Institute, University of Copenhagen , Nørregade 10, 1165 København, Denmark.
authors.forename: Jessica
authors.initials: J
authors.lastname: Bolinsson
keywords: GaAs; III−V semiconductors; growth direction; nanowire; photoluminescence; silver catalyst