Effect of Thickness on Crystal Structure and Dispersion Parameters of Haematite Iron Oxide by Spray Pyrolysis Technique |
| Ahmed T. Hassana, Ehssan S. Hassanb
aMinistry of Education, Directorate General for Education, Iraq, Baghdad bDepartment of Physics, College of Science, Mustansiriyah University, Baghdad, Iraq |
| Full Text PDF |
| Thin films of haematite iron oxide Fe2O3 (of thicknesses t=200, 300, and 400 nm) were prepared on glass substrates using a spray pyrolysis technique. X-ray diffraction measurements showed that the films were polycrystalline, with crystallite size increasing from 16.8 to 30.7 nm as the sample thickness increased. The refractive index data was used to calculate the single oscillator power and scattering energy as predicted by the Wemple-Domenico model. The dispersion energy increased from 10.86 to 16.54 eV as the thickness increased. The optical energy gap decreased from 2.74 to 2.21 eV. The calculated values for the Urbach energy were found to increase from 680 to 1230 meV as the thickness increased. |
DOI:10.12693/APhysPolA.140.295 topics: Urbach energy, transmittance, absorption coefficient |