Morphology and structure of copper-phthalocyanine and iron-phthalocyanine thin films on Ag(111)

ORAL

Abstract

Copper-phthalocyanine and iron-phthalocyanine have been in situ deposited onto Ag(111) surface at room temperature by vacuum sublimation. Thin heteroepitaxial films formed thereof have been investigated using scanning tunneling microscopy. When annealed up to $\sim $ 500\r{ }K, both molecules form well-ordered square lattices on the hexagonal substrate lattice but result in different molecular orientations within the surface unit cell. For CuPc, benzo units of the molecules are rotated by approximately 30\r{ } with respect to the surface lattice vectors forming a high-density packing whereas for FePc the benzo units are rotated by about 45\r{ }. Consequently, the square lattice constant for CuPc measured at $\sim $14 {\AA} is significantly smaller than that of $\sim $16 {\AA} for FePc. Annealing to $\sim $700\r{ }K results desorption of as much as 70{\%} of surface monolayer of phthalocyanine molecules. The aggregates are observed in dendrite-like form, and further discussion of temperature effects on CuPc and FePc thin films will be presented.

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Authors

  • Kedar Manandhar

  • Kenneth Park

    Baylor University

  • Zhen Song

  • Nilanjan Das

    Dept. of Physics, ESFM-IPN, Mexico City, Dept. of Physics, The University of Texas at El Paso, Texas A\&M University, Southeast Missouri State University, Departamento de Fisica, FCEN, Universidad de Buenos Aires, Nunez, Argentina, Cyclotron Institute, Texas A\&M University, University of Houston, Denison U., Advanced Space Propulsion Laboratory, AdAstra Rocket Company, Texas Tech University, Department of Chemistry and Biochemistry, Texas State Unv. - San Marcos, Department of Physics, Texas State Unv. - San Marcos, Rice U., Texas State University - San Marcos, Freescale Semiconductor, Inc., Varian Semiconductor Equipment Associates, Gloucester, MA, University of North Texas, Denton, TX, National Insitute of Standards \& Technology, Gaithersburg, MD, James Madison University, Harrisonburg, VA, Texas A\&M University, College Station, TX, Hong Kong University of Science and Technology; Texas Center for Superconductivity and Advanced Materials, University of Houston, Texas Center for Superconductivity at the University of Houston, University of Houston, University of Idaho, Department of Physics, Istanbul Technical University, University of California at Davis, Physics Department, University of South Florida, FL 33620, Physics Department, Texas A\&M University, TX 77843, Center for Studies in Statistical Mechanics and Complex Systems, The University of Texas at Austin, Rice University, TcSUH, University of Houston, Lawrence Berkeley National Laboratory, Hong Kong University of Science and Technology, Institute of Solid State Physics, Bulgarian Academy of Sciences, Hong Kong University of Science and Technology; Texas Center for Superconductivity, University of Houston; Lawrence Berkeley National Laboratory, Texas Center for Superconductivity, University of Houston

  • Shuguo Ma

  • Jan Hrbek

    Brookhaven National Laboratory