Abstract
Iron doped zinc oxide (Fe:ZnO) thin films were prepared on glass substrates using wet chemical process, spray pyrolysis by varying the substrate temperature (TS) in the range 300 - 450°C at a constant Fe-doping concentration of 2 at. %. The physical properties of as prepared Fe:ZnO films were investigated using various techniques. The XRD studies indicated polycrystalline nature with the (101) plane as dominant orientation and the layers exhibited the hexagonal wurtzite crystal structure. The SEM micrographs revealed uniform growth of spherical grains over the substrate surface and the EDS profiles confirm the presence of Zn, O and Fe elements in all the films. The FTIR spectra revealed that the existence of Zn-O stretching vibrational mode at 531cm-1 as a dominant mode in the films. Further the optical transmittance and reflectance properties were studied by UV-Vis-NIR spectrophotometer. The optical band gaps are computed from the differential reflectance (dR/dλ) spectra. The band gap values were varied with the change of substrate temperature in the range, 3.20 – 3.70 eV.
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