Fabrication of rubrene nanowires on vicinal (0 0 0 1) sapphire surfaces |
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Authors: | Primo? Rebernik Ribi? |
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Institution: | Laboratory for Epitaxy and Nanostructures, University of Nova Gorica, Vipavska 13, SI-5001, Nova Gorica, Slovenia |
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Abstract: | Morphology of high-vacuum deposited rubrene thin films on the annealed (0 0 0 1) vicinal sapphire surfaces was studied by atomic force microscopy in non-contact mode. Atomic force microscopy images of rubrene thin films indicate that a regular array of steps on the sapphire surface acts as a template for the growth of the arrays of rubrene nanosize wires. To further demonstrate that morphological features of a substrate are crucial in determining the morphology of rubrene layers we have grown rubrene on the sapphire surfaces that were characterized by the terrace-and-step morphology with islands. We have found preferential nucleation of rubrene molecules at the intersection between a terrace and a step, as well as around the islands located on terraces. |
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Keywords: | Atomic force microscopy Growth Semiconductor-insulator interfaces |
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