INFLUENCE OF POST DEPOSITION ANNEALING ON THE OPTICAL AND STRUCTURAL PROPERTIES OF ZINC-TETRA-TERT-BUTYL PHTHALOCYANINE THIN FILMS

B R Rejitha; C S Menon

Volume : VI, Issue : V, May - 2017

INFLUENCE OF POST DEPOSITION ANNEALING ON THE OPTICAL AND STRUCTURAL PROPERTIES OF ZINC-TETRA-TERT-BUTYL PHTHALOCYANINE THIN FILMS

B R Rejitha, C S Menon

Abstract :

Zinc-tera-tert-butylphthalocyanine (Zinc2, 9, 16, 23-tetra-tert-butyl-29H, 31H-phthalocyanine) (ZnTTBPc) is a new material in phthalocyanine family. Its molecular formula is C₄₈H₄₈N₈Zn. Phthalocyanines are organic semiconductors; ZnTTBPc in the powder form is used as the source material. Thin films of ZnTTBPc are deposited onto precleaned glass substrates kept at room temperature using a Hind Hivac vacuum coating unit. The thickness of the films is cross checked by Tolansky�s multiple beam interference technique. Films of equal thickness prepared at room temperature are annealed in air by keeping them in a furnace fitted with a temperature-controller cum recorder for one hour. The UV-VIS-NIR spectra of these samples are recorded. The optical studies are carried out by analyzing the absorption and reflection spectra. Graphs are plotted α² against photon energy .From this band gap energy of ZnTTBPc thin films are calculated. The surface morphology of the films deposited on glass substrate of as deposited and annealed samples are studied using Scanning Electron Micrographs (SEM), which show that there is a change in surface morphology of the film due to annealing.