Influence of 3,4,9,10-Perylene Tetracarboxylic Dianhydride Intermediate Layer on Molecular Orientation of Phthalocyanine

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Abstract
The influences of a 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) layer on the molecular orientation and crystalline structure of phthalocyanine (H2Pc) films grown on PTCDA/glass structures were studied by X-ray diffraction analysis, grazing incidence X-ray diffraction analysis, atomic force microscopy and infrared reflection absorption spectroscopy. The orientation of the H2Pc molecular plane became parallel to the substrate surface with the introduction of a thin PTCDA layer on a glass substrate, although the molecular plane of a H2Pc film without a PTCDA layer was almost perpendicular to the substrate surface. Such a parallel orientation of the H2Pc molecular plane was observed even when the PTCDA layer thickness was only 5 Å. It was found that the intensity of the optical absorption of a H2Pc film is significantly influenced by the molecular orientation of H2Pc, and the importance of controlling this molecular orientation is suggested.

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