Preparation and Characterization of Thermally Evaporated Octa Substituted Zinc Phthalocyanine Thin Films

Authors Vinu T. Vadakel, C.S. Menon

School of Pure and Applied Physics, Mahatma Gandhi University, Priyadarshini Hills P.O, Kottayam 686560 Kerala, India

Issue Volume 4, Year 2012, Number 4
Dates Received 25 November 2011; published online 29 December 2012
Citation Vinu T. Vadakel, C.S. Menon, J. Nano- Electron. Phys. 4 No 4, 04005 (2012)
PACS Number(s) 81.15kk, 78.20 – e, 78.20 ci
Keywords Zinc octakis octyloxy phthalocyanine, Band gap energy, Optical parameters, XRD (92) , SEM (114) .
Thin films of Zinc Octakis Octyloxy Phthalocyanine (ZnPcOC8) are prepared at a base pressure of 10 – 5 Torr using Hind Hi-Vac-12A4 thermal evaporation plant. The films are deposited onto precleaned glass substrates kept at room temperature. Absorption spectra of the films are recorded using the Shimadzu 160A UV-Visible spectrophotometer. The effect of post deposition annealing on the optical constants are studied. The nature of optical transition is found to be direct type. The optical band gap energy of the annealed samples remains almost the same. The invariance of the optical band gap shows the thermal stability of the material for optical applications. The X-ray diffraction analysis of vacuum evaporated films reveals that the crystallinity increases with increase in annealing temperature. The variation of the surface morphology with annealing is also studied using Scanning Electron Micrograph (SEM).

List of References