Blueshift in Mgx Zn1-xO alloys: Nature of bandgap bowing

Almamun Ashrafi*, Yusaburo Segawa

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    A Mg composition-dependent blueshift has been studied in Mgx Zn1-xO alloys deposited on 6H-SiC (0001) substrates. The localized exciton energy in Mgx Zn1-xO alloys for x∼0.3 was blueshifted in the range 212-248 meV. The large negative bowing parameter was estimated in Mgx Zn1-xO alloys to be 4.72±0.84 eV. This large bandgap bowing emphasizes the Stokes shift, which has been attributed to the existence of spontaneous polarization effects due to the polar growth of Mgx Zn1-xO /SiC heterostructure and local compositional inhomogeneity.

    Original languageEnglish
    Article number123528
    JournalJournal of Applied Physics
    Volume104
    Issue number12
    DOIs
    Publication statusPublished - 2008

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