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Nitrogen doped and non-doped ZnO films are grown by the plasma-assisted metal-organic chemical vapor deposition (MOCVD) on sapphire. X-ray diffraction spectra show that they are both strongly c-oriented while the N-doped sample is of better crystal quality. A strong emission coming from A-exciton is observed at 10 and 77K photoluminescence (PL) spectra in both samples while deep level transition is...
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