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Fig. 1. Mg content in the Mg_xZn_1xO epitaxial films as a function of target Mg content. First citation in article

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Fig. 2. Mg content dependences of the a- and c-axis lattice parameters and the cell volume of Mg_xZn_1xO films. Segregation of the MgO impurity phase was observed for x0.33 of Mg content. First citation in article

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Fig. 3. X-ray diffraction rocking curves showing (0002) and (101) scans of a Mg_0.19Zn_0.81O film. The width of the peaks are comparable to the highest quality pure ZnO films. First citation in article

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Fig. 4. Transmittance spectra of Mg_xZn_1xO films measured at room temperature. The inset shows the band gap (E_g) determined from the spectra assuming an ²(hE_g) dependence, where and h are the absorption coefficient and the photon energy, respectively. First citation in article

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Fig. 5. Photoluminescence (solid lines) and absorption spectra (dotted lines) of Mg_xZn_1xO films (0x0.33). The spectra were taken at 4.2 K. The inset shows the luminescence peak position as a function of Mg content. For the films with 0x0.14, HeCd laser excitation (3.81 eV) was employed. For the films with 0.19x0.33, XeCl laser pulses (4.03 eV) were used. Solid triangles corresponded to the peaks due to phonon replicas. First citation in article