Web of Science: 11 citations, Scopus: 11 citations, Google Scholar: citations,
Long-lived excitons in GaN/AlN nanowire heterostructures
Beeler, Mark (Commissariat à l’énergie atomique et aux énergies alternatives (França))
Lim, Caroline B. (Commissariat à l’énergie atomique et aux énergies alternatives (França))
Hille, Pascal (Justus Liebig-Universität Gießen. Physikalisches Institut)
Bleuse, Joel (Commissariat à l’énergie atomique et aux énergies alternatives (França))
Schörmann, J. (I. Physikalisches Institut, Justus-Liebig-Universität Gießen)
De La Mata, Maria (Institut de Ciència dels Materials de Barcelona)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Eickhoff, M. (I. Physikalisches Institut, Justus-Liebig-Universität Gießen)
Monroy, Eva (Commissariat à l’énergie atomique et aux énergies alternatives (França))

Date: 2015
Abstract: GaN/AlN nanowire heterostructures can display photoluminescence (PL) decay times on the order of microseconds that persist up to room temperature. Doping the GaN nanodisk insertions with Ge can reduce these PL decay times by two orders of magnitude. These phenomena are explained by the three-dimensional electric field distribution within the GaN nanodisks, which has an axial component in the range of a few MV/cm associated to the spontaneous and piezoelectric polarization, and a radial piezoelectric contribution associated to the shear components of the lattice strain. At low dopant concentrations, a large electron-hole separation in both the axial and radial directions is present. The relatively weak radial electric fields, which are about one order of magnitude smaller than the axial fields, are rapidly screened by doping. This bidirectional screening leads to a radial and axial centralization of the hole underneath the electron, and consequently, to large decreases in PL decay times, in addition to luminescence blue shifts.
Note: Número d'acord de subvenció EC/FP7/278428
Note: Número d'acord de subvenció MINECO/MAT2014-51480-ERC
Note: Número d'acord de subvenció AGAUR/2014/SGR-1638
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Language: Anglès.
Document: article ; recerca ; publishedVersion
Published in: Physical Review B, Vol. 91, issue 20 (May 2015) , art. 205440, ISSN 1550-235X

DOI: 10.1103/PhysRevB.91.205440


8 p, 2.1 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2018-12-17, last modified 2019-02-06



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