Stranski-Krastanov growth of para-sexiphenyl on Cu(110)–(2×1)O revealed by optical spectroscopy
Literature Information
Lidong Sun, Günther Weidlinger, Mariella Denk, Richard Denk, Michael Hohage, Peter Zeppenfeld
We have studied the growth of para-sexiphenyl (p-6P) on the Cu(110)–(2×1)O surface using reflectance difference spectroscopy (RDS) in combination with scanning tunneling microscopy (STM). The evolution of the optical anisotropy reveals that the growth of p-6P on the Cu(110)–(2×1)O surface at room temperature follows the Stranski-Krastanov growth mode with a two monolayer thick wetting layer. During all stages of growth, the p-6P molecules are well orientated with their long molecular axis aligned parallel to the Cu–O rows along the [001] direction of the Cu(110) substrate. The high packing density of the p-6P molecules in the first and second monolayer evidenced by RDS and STM is believed to be responsible for the switch from layer-by-layer to three-dimensional island growth.
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