title: Structural Properties of wurtzite InP-InGaAs nanowire core-shell heterostructures.
abstract: We report on growth and characterization of wurtzite InP-In(1-x)Ga(x)As core-shell nanowire heterostructures. A range of nanowire structures with different Ga concentration in the shell was characterized with transmission electron microscopy and X-ray diffraction. We found that the main part of the nanowires has a pure wurtzite crystal structure, with occasional stacking faults occurring only at the top and bottom. This allowed us to determine the structural properties of wurtzite In(1-x)Ga(x)As. The InP-In(1-x)Ga(x)As core-shell nanowires show a triangular and hexagonal facet structure of {1100} and {101̅0} planes. X-ray diffraction measurements showed that the core and the shell are pseudomorphic along the c-axis, and the strained axial lattice constant is closer to the relaxed In(1-x)Ga(x)As shell. Microphotoluminescence measurements of the nanowires show emission in the infrared regime, which makes them suitable for applications in optical communication.
authors.affiliation: †The Nanometer Structure Consortium, Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
authors.forename: Magnus
authors.initials: M
authors.lastname: Heurlin
authors.affiliation: ‡Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
authors.forename: Tomaš
authors.initials: T
authors.lastname: Stankevič
authors.affiliation: ‡Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
authors.forename: Simas
authors.initials: S
authors.lastname: Mickevičius
authors.affiliation: †The Nanometer Structure Consortium, Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
authors.forename: Sofie
authors.initials: S
authors.lastname: Yngman
authors.affiliation: †The Nanometer Structure Consortium, Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
authors.forename: David
authors.initials: D
authors.lastname: Lindgren
authors.affiliation: †The Nanometer Structure Consortium, Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
authors.forename: Anders
authors.initials: A
authors.lastname: Mikkelsen
authors.affiliation: ‡Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
authors.forename: Robert
authors.initials: R
authors.lastname: Feidenhans'l
authors.affiliation: †The Nanometer Structure Consortium, Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
authors.forename: Magnus T
authors.initials: MT
authors.lastname: Borgström
authors.affiliation: †The Nanometer Structure Consortium, Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
authors.forename: Lars
authors.initials: L
authors.lastname: Samuelson
keywords: InGaAs; InP; Nanowire; X-ray diffraction; core−shell; wurtzite