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Measurements of Copper Phthalocyanine Ultrathin Films by Scanning Tunneling Microscopy and Spectroscopy

We have measured very thin films of copper phthalocyanine on graphite by means of scanning tunneling microscopy (STM) and spectroscopy (STS) in air. Microscopic surface structures, such as islands and grains, were found by STM. Among them, a sticklike island, with its edge parallel to the graphite lattice, suggested the epitaxial growth of the deposited film. Although the individual molecular shapes could not be obtained clearly, tunneling spectra taken simultaneously with STM provided information about the local distribution and orientation of the molecules.