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Blueshift in MgxZn1-xO alloys: nature of bandgap bowing

Ashrafi, Abm; Segawa, Y


A Mg composition-dependent blueshift has been studied in MgxZn1−xO alloys deposited on 6H-SiC(0001) substrates. The localized exciton energy in MgxZn1−xO alloys for x ∼ 0.3 was blueshifted in the range 212–248 meV. The large negative bowing parameter was estimated in MgxZn1−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 MgxZn1−xO/SiC heterostructure and...[Show more]

CollectionsANU Research Publications
Date published: 2008-12-23
Type: Journal article
Source: Journal of Applied Physics
DOI: 10.1063/1.3050338


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