Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Organic Thin Films, Organic-Inorganic Interfaces II (joint session DS/CPP)
CPP 48.5: Talk
Tuesday, March 17, 2020, 12:15–12:30, CHE 91
Epitaxial Growth of PEN and PFP Thin Films on hBN(0001) — •Darius Günder1, Tobias Breuer1, Takashi Taniguchi2, and Gregor Witte1 — 1Philipps University, Marburg, Germany — 2National Institute for Materials Science, Tsukuba, Japan
Hexagonal boron nitride (hBN) has gained considerable attention because it is an insulating 2D material, which is frequently used as gate dielectric in transistor applications [1]. Combining XRD, AFM, UV/Vis spectroscopy and polarization resolved optical microscopy we demonstrate that pentacene (PEN) and perfluoropentacene (PFP) form epitaxial films on exfoliated hBN(0001) substrates where molecules adopt a lying orientation on highly ordered hBN surfaces, while they grow in an upright molecular fashion on defective surfaces. We demonstrate in particular that PEN does not crystallize in a new polymorph as reported by Zhang et al. [2]. Based on our azimuthal analyses, the epitaxial relation between PEN and PFP films and hBN substrates is resolved and compared to the similar growth behavior on graphite substrates [3,4].
[1] M. Kratzer et al., J. Journal of Physics D 52, 383001 (2019).
[2] Y. Zhang et al., Phys. Rev. Lett. 116, 016602 (2016).
[3] J. Götzen et al., Phys. Rev. B 81, 085440 (2010).
[4] R. Felix et al., Cryst. Growth Des 16, 6941 (2016).