Structural and Optical Properties of Phthalocyanine Thin Films Grown on Glass with 3,4,9,10-Perylene Tetracarboxylic Dianhydride Intermediate Layer

摘要

The molecular orientation and optical properties of phthalocyanine (H_2Pc) films grown on glass with a 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) intermediate layer were investigated by infrared reflection absorption spectroscopy and absorption spectrum analysis. The orientation of the H_2Pc molecular plane became almost parallel to the substrate surface with the introduction of a thin PTCDA layer on a glass substrate during initial growth. However, the orientation of the H_2Pc molecular plane turned from parallel to oblique with increasing layer thickness, and finally the angle approached 26.5°, which indicates the formation of a crystalline phase of α-H_2Pc with the b-axis perpendicular to the substrate surface. The optical absorption of the film was significantly affected by the molecular arrangement, and the importance of molecular orientation control was suggested.