Adel H. Omran Alkhayatt1,a*
, Azhar A. Habeeb2,b and Nibras F. Ali3,c
1,2,3University of Kufa, Faculty of Science, AL-Najaf, Iraq
Keywords: Spray Pyrolysis; Optical properties, Hematite Fe2O3; Thin films.
Abstract. By using the spray pyrolysis technique, un-doped and Fluorine highly doped iron oxide
Fe2O3 thin films were deposited on a glass substrate at a temperature of 380 oC and at different
dopant concentrations (10, 15, and 20) %. The crystal structure and optical characterization of the
deposited thin film were performed by x-ray diffraction and UV-Vis spectrophotometer. The XRD
results revealed that the presence of a very wide peak in-between (15-35) o angles, this gives
evidence that un-doped and F-doped Fe2O3 thin films have very low crystallinity and amorphous
structures. The optical absorbance edge was shifted towards short wavelengths (blue shift) and the
absorbance was reduced with the increase of Fluorine dopant content. The optical constants such as
absorption, extinction coefficients, and the optical conductivity of the deposition films were
investigated as a function of dopant content. The optical energy band gap of un-doped and Fe2O3:F
thin films was found to be increased when increasing of the Fluorine content and exhibited a direct
allowed energy gap (Eg) from (2.55 to 2.7) eV which can related to the Burstein-Moss effect.