Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 38: Semiconductor Substrates

O 38.8: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Ordered growth of hexagonal molecules on hexagonal surfaces: a new type of epitaxy? — •Falko Sojka, Matthias Meissner, Tobias Huempfner, Roman Forker, and Torsten Fritz — Friedrich Schiller University, Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena, Germany

We analyzed the growth of diverse monolayers of organic molecules with hexagonal symmetry on different hexagonal surfaces using coronene and hexa-peri-hexabenzocoronene (HBC). By compensating geometric distortions and other systematic errors in low-energy electron diffraction (LEED), high-precision determination of the epitaxial matrices using numerical fitting routines is feasible [1, 2]. The LEED studies are complemented by other methods like low temperature scanning tunneling microscopy (LT-STM) and differential reflectance spectroscopy (DRS) [3].

We found well-defined ordered structures which are, however, partially in contrast to the literature. Within error margins the lattice alignment cannot be assigned to any known type of epitaxy [4] and may therefore point towards a new type of epitaxy.

References: [1] F. Sojka et al., Rev. Sci. Instrum. 84, 015111 (2013).

[2] F. Sojka et al., Ultramicroscopy 133, 35-40 (2013).

[3] R. Forker et al., Annu. Rep. Prog. Chem., Sect. C: Phys. Chem. 108, 34-68 (2012).

[4] S.C.B. Mannsfeld et al., Phys. Rev. Lett. 94, 056104 (2005).