Spectroscopic and structural properties of Zinc-Phthalocyanine prepared by pulsed laser deposition

Abstract

Zinc Phthalocyanine (ZnPc) was prepared by pulsed laser deposition using Q-Switching Nd:YAG laser with wavelength 1064nm, frequency 6Hz and energy 240mJ at room temperature under vacuum condition with 10-3torr. Ultra violet-Visible spectra were used to evaluated the optical properties included the absorption coefficient, extinction coefficient, refractive index and energy gap of the ZnPc films and the results were discussed. The energy gap of ZnPc film with different thickness are varied from (1.7 to 1.5 eV) at Q-band and from(3 to 2.7eV)at B-band for increasing thickness from (150 to 500 nm).The optical transition was found to be direct and allowed transition. X-ray diffraction (XRD) was used to analyze the ZnPc organic thin films with different thickness that the preferential orientation around (111) at 7 degree. FTIR spectra for ZnPc and metal free phthalocyanine (H2Pc) is used to find the molecular vibration . It can be observed that a strong peak around 3500 Cm-1 which refers to N-H bond for metal free phthalocyanine where absents for ZnPc and appear a new strong line around 730 Cm-1 which refers to Zn metal.