Thin films of Nickel Phthalocyanine (NiPc) are prepared of a base pressure of 10-5 m bar using Edwards 306 system of thermal evaporation technique .The films are deposited on to glass substrate at various thickness (50, 265 , 350) nm. The optical properties and spectral behavior of of NiPc films as a function of thickness were studied at room temperature using UV - Visible –NIR absorption spectra. Increase in thickness, leads to increase absorbance of films and shifts peak position of all bands towards low energy side of spectra. Direct allowed transitions near the sort absorption edges were observed. Present studies reveal that the optical energy gap of NiPc thin film is around (3.3-3.25) eV for direct energy band gap respect to B bands, and around (1.68-1.63) eV for direct energy band gap respect to Q bands. The UV-Visible bands of Ni-Phthalocyanine are broadened and overlap in the solution in dioxane compare with thin film. The energy gap is slightly dependent on the thin film thickness. The optical constant of absorption coefficient α, refractive index, n, and extinction coefficient, k, were calculated and it was found that they are slightly dependent of film thickness.
T. Hussein , Eman M. Nasir , Addnan H. Al-Aarajiy, Mohammed
"Study on the UV-Visble of Ni-Phthalocyanine thin film Optical Properties,"
International Journal of Thin Film Science and Technology: Vol. 1
, Article 4.
Available at: https://digitalcommons.aaru.edu.jo/ijtfst/vol1/iss2/4