Abstract
Ultra-thin films of the cofacially stacked phthalocyanine polymer, (A1PcF) n ' have been grown using the highly controlled technique of MBE. A parallel orientation of the polymer backbone to the substrate surface occurs in films on silicon and quartz, but epitaxy is not apparent. On single crystal alkalihalide substrates, the backbone is perpendicular to the substrate surface and an epitaxial relationship exists which is influenced by the electrophillic interaction between the substrate and phthalocyanine molecule. Especially, the ultra-thin films grown on the (100) surfaces of KCl or KBr single crystals show unusual spectroscopic properties which can be described by the possibility of pseudomorphic layer formation at the thin film/substrate interface. The existence of the layer (“defect”) is directly related to the degree of lattice mismatch and sterically enhanced interaction between the substrate and phthalocyanine.
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