Formation of Ligand-Coordinated Phthalocyanine Films by Vacuum Deposition Method

Abstract

The effect of the deposition rate on the crystallinity of vacuum-deposited films of phthalocyanine and the formation of ligand-coordinated phthalocyanine films were studied. The crystallinity of phthalocyanine films increased as the deposition rate was lowered even if the substrate was kept at room temperature. The film deposited at the rate less than 100 A/min had especially high crystallinity which was comparable to that of the film deposited on the substrate prepared at 200°C. Using these deposition conditions the formation of ligand-coordinated phthalocyanine film was studied by the co-deposition method. Iron phthalocyanine (FePc) and 1, 2-bis(diphenylphosphino)ethane (DPP) as ligand were evaporated from two sources simultaneously. Coordination of DPP with FePc was confirmed by the measurements of infrared spectra and visible light absorption spectra. The ratio of DPP/FePc was determined as 2/1 by fluorescence X-ray measurement X-Ray diffraction pattern of the FePc-DPP film showed the peak having a d-value of 12.1A. This indicated that the FePc-DPP film had a crystalline form. It was re vealed that the ligand-coordinated phthalocyanine films could be formed by the rate-controlled co-deposition method.