Frequency modulation atomic force microscopy (FM-AFM) was employed to study molecular structures of rubrene single crystals in ultrahigh vacuum. Molecularly flat and extraordinarily wide terraces were extended over the width of more than a few micrometers with monomolecular steps. Molecular packing arrangements and internal structures were revealed by FM-AFM. The unit cell determined by FM-AFM was consistent with the lattice parameters of bulk crystal within the experimental error, suggesting that the surface structure of rubrene is not reconstructed.

Topics
Organic semiconductors, Field effect transistors, Crystal lattices, Crystalline solids, Crystallography, Atomic force microscopy, Scanning tunneling microscopy, X-ray diffraction, Organic compounds, Medical imaging
© 2009 American Institute of Physics.
2009
American Institute of Physics

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