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    Optical Properties of Strained Wurtzite Gallium Phosphide Nanowires

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    Type
    Article
    Authors
    Greil, J.
    Assali, S. cc
    Isono, Y.
    Belabbes, Abderrezak
    Bechstedt, F. cc
    Valega Mackenzie, F. O.
    Silov, A. Yu.
    Bakkers, E. P. A. M.
    Haverkort, J. E. M.
    KAUST Department
    Materials Science and Engineering Program
    Date
    2016-06-08
    Permanent link to this record
    http://hdl.handle.net/10754/614818
    
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    Abstract
    Wurtzite gallium phosphide (WZ GaP) has been predicted to exhibit a direct bandgap in the green spectral range. Optical transitions, however, are only weakly allowed by the symmetry of the bands. While efficient luminescence has been experimentally shown, the nature of the transitions is not yet clear. Here we apply tensile strain up to 6% and investigate the evolution of the photoluminescence (PL) spectrum of WZ GaP nanowires (NWs). The pressure and polarization dependence of the emission together with a theoretical analysis of strain effects is employed to establish the nature and symmetry of the transitions. We identify the emission lines to be related to localized states with significant admixture of Γ7c symmetry and not exclusively related to the Γ8c conduction band minimum (CBM). The results emphasize the importance of strongly bound state-related emission in the pseudodirect semiconductor WZ GaP and contribute significantly to the understanding of the optoelectronic properties of this novel material.
    Citation
    Optical Properties of Strained Wurtzite Gallium Phosphide Nanowires 2016, 16 (6):3703 Nano Letters
    Sponsors
    J.G. acknowledges funding by the Austrian Science Fund (FWF): Proj. No. J3540-N30. This work was supported by the Dutch Organization for Scientific Research (NWO-VICI 700.10.441).
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    ISSN
    1530-6984
    1530-6992
    DOI
    10.1021/acs.nanolett.6b01038
    PubMed ID
    27175743
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.6b01038
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.nanolett.6b01038
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