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Title
| - The Influence of Steps on the Orientation of CopperPhthalocyanine Monolayers on Au(111)
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Abstract
| - The structure of monolayer films of copper phthalocyanine (CuPc) deposited on a Au(111) surface inultrahigh vacuum is studied using scanning tunneling microscopy and low-energy electron diffraction.CuPc molecules adsorb with their molecular plane parallel to the surface and form a highly orderedoverlayer with a square unit cell. On terraces wider than ∼15 nm, the orientation of the monolayer isdetermined by the underlying substrate and the sides of CuPc square unit cells coincide very closely withthe [112̄] and [11̄0] directions of the Au(111) surface. On narrow terraces, the sides of the CuPc unit cellsare aligned along the step edges. This effect is explained in terms of the maximization of coverage whichfavors the formation of the CuPc domains where the molecules are aligned parallel to the step edges.
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