Adsorption Behavior Research Of Iron Phthalocyanine On Ag(110) Surface By STM

Organic semiconductors, because of its potential application in the electronics field become an important research area in recent years. And as a member of this large family, the metal phthalocyanines form a family of compounds with wide range of commercial applications such as catalysts or dyes, and more recently in thin film technology because of their electro-optical properties. Meanwhile, the reliable production of high ordered, self-assembled phthalocyanine(Pc) superstructures on a large variety of solid surfaces represents a major progress toward the fabrication of manometer-sized electronic devices such as thin-film transistors, solar cells, nonlinear optical devices, and sensors. Obviously, the associated optical, electrical and other properties can be improved by growing a clean thin-film of metal phthalocyanines (MPcs). Thus, the growth of MPcs and its internal mechanism is an important part.The growth behavior of iron phthalocyanine(FePc) adsorption on Ag (110) surface at different coverage was studied by scanning tunneling microscopy (STM) at room temperature. At the coverage of 3.5 ML an ordered multilayer (-3 3,4 2) phase is observed with a lateral shift, and we interpret the densely-packed unit cell as a result of substrate commensuration and intermolecular van der Waals attractive interaction. While concentrating on the in-plane lateral shift, we revealed its specifically favored direction along [110] azimuth, which may provide new perspective to understand the intermolecular interaction among FePc molecules.