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Optical transmission and absorption spectra of undoped ZnO, undoped , and Al-doped films. In the film equals 0.11 and the Al content is about .
Band-gap energy as a function of the electron concentration in Al-doped films. The solid and dashed lines are the fitting curves.
Dependence of the band-gap blueshift on the carrier concentration of Al-doped films, with increasing from 0 to 0.21. The points are the experimental data. The curves show the fitting results using the modified BM theory. The inset shows the electron effective masses of alloys with different Mg contents.
Resistivity, Hall mobility, and electron concentration of films. The Al contents in these films are about .
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