Structural and optical properties of polycrystalline MgxZn1-xO and ZnO: Mn films prepared by chemical spray pyrolysis

Polycrystalline Mg(x)Z(1-x)O (0.00 <= x <= 0.21) and ZnO:Mn films prepared by chemical spray pyrolysis were characterized by X-ray diffraction, optical transmittance, photoacoustic (PA) spectroscopy and photoluminescence (PL). Successful growth of the MgxZn1-xO (0.00 <= x <= 0.21) films was confirmed by the blue shift of both the near-band-edge PL peak and absorption edge with increasing the alloy composition x. However, the influence of the tail states caused by the deviation from stoichiometric compsosition and/or the spatial fluctuation of the alloy composition x was observed on the PA and PL spectra. Both the transmittance and PA spectra for the ZnO:Mn films showed the absorption band due to the d-d transitions in Mn2+ ion. (c) 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.