Abstract
MgxZn1-xO films were successfully grown on a-plane sapphire (112̄0) substrates by remote-plasma-enhanced metalorganic chemical vapor-deposition (RPE-MOCVD) using diethyl zinc (DEZn) and bis-ethylcyclopentadienyl magnesium (EtCp2Mg). By increasing magnesium content in the films, the crystal structure was shifted through a mixed state from wurtzite to rock salt. The optical band-gap of the films at nearly 3.28 eV was shifted to 3.69 eV by alloying with magnesium depending on the alloy composition. Both optical absorption edges and emission peaks of MgxZn1-xO films shifted to higher energy when the magnesium content at room temperature was increased, showing alloy broadening. The Stokes' shift of wurtzite MgxZn1-xO alloy films was quantitatively evaluated. The results are relevant to exciton localization.
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