The optical Properties of Fe2O3 Thin Film Prepared By Chemical spray pyrolysis Deposition (CSP)

Abstract

In this work, Fe2O3thin films have been prepared on glass substrate by chemical
spray pyrolysis (CSP) technique at temperature 450oC. Structural and optical properties
of Fe2O3 thin films have been investigated and analyzed extensively with respect to
deposition time.
The XRD results indicate that the structure of all prepared thin films from aqueous
solutions FeCl3 were polycrystalline in nature and has a rhombohedral (hexagonal) phase
with preferred orientation along (104) plane.
The average grain size values for all prepared films have been found in the range from
76.543 to 83.258 nm , which indicates that all films have been Nano crystalline .The
absorbance and transmittance spectra have been recorded in the wavelength range 300-
600 nm, which showed that the absorption edges of Fe2O3 thin films differed at different
deposition times. The optical band gap for allowed direct transition has been decreased
from (2.4813 to 2.449 )eV and with increasing deposition time. Moreover, the effect of
deposition time on optical constants (absorption coefficient, reflectance, extinction
coefficient, and refractive) has been investigated.