The effects of annealing process influence on optical properties and the molecular orientation of selected organometallic compounds thin films

The paper presents the optical properties of four metallophtalocyanines (MPcs, M = Cu, Co. Mg and Zn) and two metallophtalocyanine chlorides (MCIPcs, M = Al, Ga) thin films. Investigated films were fabricated by Physical Vapor Deposition (PVD) in high vacuum onto quartz substrates. After fabrication both MPcs and MCIPcs thin films were undergone an annealing process in ambient atmosphere for 12 h at temperature equal 150 degrees C or 250 degrees C. The absorbance spectra were measured in range 190-1100 nm to investigate the optical and structural properties. Theoretical model of physical dimer was used to explain experimental results. The position and shape of the main absorbance peak (Q-band) in these materials are compared and discussed, taking into consideration the molecular arrangement and the longitudinal contribution which depends on the transition moment orientation. It was found that annealing process changing both optical and structural properties of MPcs and MCIPcs comparing to samples without applying the process. (C) 2012 Elsevier B.V. All rights reserved.