Deposition Sequence Determines Morphology of C₆₀ and 3,4,9,10-Perylenetetracarboxylic Diimide Islands on CaF₂(111)

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• The coadsorption of C₆₀ and 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) molecules on atomically flat terraces of the CaF₂(111) surface is studied under ultra-high vacuum conditions using non-contact atomic force microscopy (NC-AFM). Deposition of PTCDI molecules on CaF₂(111) yields needle-shaped, molecularly well-ordered crystals. Upon following deposition of C₆₀ molecules, the PTCDI islands are completely covered by C₆₀. For the opposite deposition order, the initially grown C₆₀ islands are not covered by PTCDI molecules, instead, most of the PTCDI molecules condense in pure islands, while only few PTCDI molecules nucleate at the edges of previously grown C₆₀ islands. Simultaneous deposition of both molecules results in an intermixed phase with yet another island morphology. The observed fundamental differences in island morphology suggest that different dewetting barriers are involved in the formation process.

• 2011-08-25

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