Author(s): Abdulazeez O. Mousa and Ali F. Marmoss*
Lead oxide (PbO) thin films were deposited onto glass substrates using chemical spray pyrolysis (CSP) technique. The effect of substrate temperature on the structural and optical properties of PbO thin films has been investigated at thichness ( 177) nm . From the X-Ray diffraction measurement found all the films were polycrystalline in nature with tetragonal and orthrhombic structure corresponding to α -PbO and β -PbO. The films coated at 200 °C and 250 °C were (101) oriented, while the films deposited at 300 °C and 350 °C were (002) oriented. Above 350 °C, the pure tetragonal nature deteriorated and the peaks corresponding to orthorhombic phase were observed. The crystallite size of the films increased from 21.79 nm at (200°C) to 53.14 nm at (300°C) and then decreased with the increasing of substrate temperature. Atomic force microscopic (AFM) measurement showed the grain size ranging of (74.44-120.12) nm. From the UV-VIS we found the band gap of the films increased from (2.31) eV to (2.80) eV with the increasing of substrate temperature.