We investigate the dependence on Mg content of the lattice parameters and the surface morphology of nonpolar [formula] Zn1−xMgxO (x≤0.55) grown by molecular beam epitaxy. The anisotropy of the lattice parameters gives r

Chauveau, J.-M.; Vives, J.; Zuniga-Perez, J.; Laügt, M.; Teisseire, M.; Deparis, C.; Morhain, C.; Vinter, B.
December 2008
Applied Physics Letters;12/8/2008, Vol. 93 Issue 23, p231911
Academic Journal
We investigate the dependence on Mg content of the lattice parameters and the surface morphology of nonpolar [formula] Zn1-xMgxO (x≤0.55) grown by molecular beam epitaxy. The anisotropy of the lattice parameters gives rise to an unusual in-plane strain state in the ZnO QWs: tensile strain along [1100] and compressive strain along [0001]. For a Zn0.6Mg0.4O barrier, the strain in a ZnO QW reaches -1.3% along [0001] and +0.3% along [1100]. This induces a strong blueshift of the excitonic transitions, in addition to the confinement effects, which we observe in photoluminescence excitation experiments.


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