title: Pseudodirect to Direct Compositional Crossover in Wurtzite GaP/InxGa1-xP Core-Shell Nanowires.
abstract: Thanks to their uniqueness, nanowires allow the realization of novel semiconductor crystal structures with yet unexplored properties, which can be key to overcome current technological limits. Here we develop the growth of wurtzite GaP/InxGa1-xP core-shell nanowires with tunable indium concentration and optical emission in the visible region from 590 nm (2.1 eV) to 760 nm (1.6 eV). We demonstrate a pseudodirect (Γ8c-Γ9v) to direct (Γ7c-Γ9v) transition crossover through experimental and theoretical approach. Time resolved and temperature dependent photoluminescence measurements were used, which led to the observation of a steep change in carrier lifetime and temperature dependence by respectively one and 3 orders of magnitude in the range 0.28 ± 0.04 ≤ x ≤ 0.41 ± 0.04. Our work reveals the electronic properties of wurtzite InxGa1-xP.
authors.affiliation: Department of Applied Physics, Eindhoven University of Technology , 5600 MB Eindhoven, The Netherlands.
authors.forename: L
authors.initials: L
authors.lastname: Gagliano
authors.affiliation: Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.|Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universitat , Max-Wien-Platz 1, D-07743 Jena, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Belabbes
authors.affiliation: L-NESS and Department of Materials Science, University of Milano Bicocca , 20125, Milano, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Albani
authors.affiliation: Department of Applied Physics, Eindhoven University of Technology , 5600 MB Eindhoven, The Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Assali
authors.affiliation: Department of Applied Physics, Eindhoven University of Technology , 5600 MB Eindhoven, The Netherlands.|Philips Innovation Laboratories Eindhoven , High Tech Campus 11, 5656AE Eindhoven, The Netherlands.
authors.forename: M A
authors.initials: MA
authors.lastname: Verheijen
authors.affiliation: L-NESS and Department of Materials Science, University of Milano Bicocca , 20125, Milano, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Miglio
authors.affiliation: Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universitat , Max-Wien-Platz 1, D-07743 Jena, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Bechstedt
authors.affiliation: Department of Applied Physics, Eindhoven University of Technology , 5600 MB Eindhoven, The Netherlands.
authors.forename: J E M
authors.initials: JE
authors.lastname: Haverkort
authors.affiliation: Department of Applied Physics, Eindhoven University of Technology , 5600 MB Eindhoven, The Netherlands.|Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands.
authors.forename: E P A M
authors.initials: EP
authors.lastname: Bakkers