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Carbon enhanced blue-violet luminescence in ZnO films grown by pulsed laser deposition
R.J. Mendelsberg,J. Kennedy,S.M. Durbin,R.J. Reeves 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
samples were all deposited onc-axis sapphire at dierent ambient oxygen pressures. They were then characterized using ellipsometry,atomic-force microscopy (AFM), photoluminescence (PL) spectroscopy, Rutherford backscattering spectroscopy (RBS), and nuclearreaction analysis (NRA).Along with the characteristic band-edge (3.36 eV) and deep level (2.3 eV) PL features, strong blue/violet emissions around 3 eV werealso observed and are generally attributed to zinc vacancies and zinc interstitials. NRA reveals carbon impurities in all samples and theintroduction of more carbon impurities enhanced the blue/violet emissions and inhibited the green luminescence. It is concluded that thecarbon impurities promote the zinc related native defects in ZnO and may also be radiative centers in the violet part of the spectrum.