Optical study of the band structure of wurtzite GaP nanowires

S. Assali, J. Greil, I. Zardo, A. Belabbes, M. W.A. De Moor, Sebastian Koelling, P. M. Koenraad, F. Bechstedt, E. P.A.M. Bakkers, J. E.M. Haverkort

    Research output: Contribution to journalArticleScientificpeer-review

    19 Citations (Scopus)

    Abstract

    We investigated the optical properties of wurtzite (WZ) GaP nanowires by performing photoluminescence (PL) and time-resolved PL measurements in the temperature range from 4 K to 300 K, together with atom probe tomography to identify residual impurities in the nanowires. At low temperature, the WZ GaP luminescence shows donor-acceptor pair emission at 2.115 eV and 2.088 eV, and Burstein-Moss band-filling continuum between 2.180 and 2.253 eV, resulting in a direct band gap above 2.170 eV. Sharp exciton α-β-γ lines are observed at 2.140-2.164-2.252 eV, respectively, showing clear differences in lifetime, presence of phonon replicas, and temperature-dependence. The excitonic nature of those peaks is critically discussed, leading to a direct band gap of ∼2.190 eV and to a resonant state associated with the γ-line ∼80 meV above the Γ8C conduction band edge.

    Original languageEnglish
    Article number044304
    Number of pages11
    JournalJournal of Applied Physics
    Volume120
    Issue number4
    DOIs
    Publication statusPublished - 28 Jul 2016

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