title: Direct Measurement of Polarization-Induced Fields in GaN/AlN by Nano-Beam Electron Diffraction.
abstract: The built-in piezoelectric fields in group III-nitrides can act as road blocks on the way to maximizing the efficiency of opto-electronic devices. In order to overcome this limitation, a proper characterization of these fields is necessary. In this work nano-beam electron diffraction in scanning transmission electron microscopy mode has been used to simultaneously measure the strain state and the induced piezoelectric fields in a GaN/AlN multiple quantum well system.
authors.affiliation: Department of Materials Science and Metallurgic Engineering, and Inorganic Chemistry, Faculty of Sciences, University of Cádiz, Spain.|IMEYMAT: Institute of Research on Electron Microscopy and Materials of the University of Cádiz, Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Carvalho
authors.affiliation: Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany.
authors.forename: Knut
authors.initials: K
authors.lastname: Müller-Caspary
authors.affiliation: Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany.
authors.forename: Marco
authors.initials: M
authors.lastname: Schowalter
authors.affiliation: Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany.
authors.forename: Tim
authors.initials: T
authors.lastname: Grieb
authors.affiliation: Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany.
authors.forename: Thorsten
authors.initials: T
authors.lastname: Mehrtens
authors.affiliation: Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Rosenauer
authors.affiliation: Department of Materials Science and Metallurgic Engineering, and Inorganic Chemistry, Faculty of Sciences, University of Cádiz, Spain.|IMEYMAT: Institute of Research on Electron Microscopy and Materials of the University of Cádiz, Spain.
authors.forename: Teresa
authors.initials: T
authors.lastname: Ben
authors.affiliation: Department of Materials Science and Metallurgic Engineering, and Inorganic Chemistry, Faculty of Sciences, University of Cádiz, Spain.|IMEYMAT: Institute of Research on Electron Microscopy and Materials of the University of Cádiz, Spain.
authors.forename: Rafael
authors.initials: R
authors.lastname: García
authors.affiliation: IPFN, Instituto Superior Técnico, Campus Tecnológico e Nuclear, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal.|Departamento de Física Aplicada y Centro de Micro-Análisis de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Andrés
authors.initials: A
authors.lastname: Redondo-Cubero
authors.affiliation: IPFN, Instituto Superior Técnico, Campus Tecnológico e Nuclear, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal.
authors.forename: Katharina
authors.initials: K
authors.lastname: Lorenz
authors.affiliation: Univ. Grenoble Alpes, CEA/CNRS Group, "Nanophysique et Semiconducteurs", F-38000 Grenoble, France.
authors.forename: Bruno
authors.initials: B
authors.lastname: Daudin
authors.affiliation: Department of Materials Science and Metallurgic Engineering, and Inorganic Chemistry, Faculty of Sciences, University of Cádiz, Spain.|IMEYMAT: Institute of Research on Electron Microscopy and Materials of the University of Cádiz, Spain.
authors.forename: Francisco M
authors.initials: FM
authors.lastname: Morales