Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VI
O 96.10: Vortrag
Donnerstag, 15. März 2018, 17:30–17:45, MA 004
Charge state control of F16CoPc on h-BN/Cu(111) — •Mathias Pörtner1, Yinying Wei2, Alexander Riss1, Knud Seufert1, Manuela Garcia1, Johannes V. Barth1, Lars Diekhöner2, and Willi Auwärter1 — 1Physik-Department E20, Technische Universität München, James-Franck-Str. 1, D-85748 Garching, Germany — 2Department of Physics and Nanotechnology, Fredrik Bajers Vej 5, DK-9100 Aalborg, Denmark
Molecules on metal supported hexagonal boron nitride (h-BN) are of great interest as far as their electronic properties and self-assemblies are accessible by scanning probe methods [1]. Here, we report on the control of the charge state of F16CoPc on atomically thin h-BN on Cu(111) studied by low temperature scanning tunneling microscopy and spectroscopy. In the submonolayer regime, molecules adsorb on pore areas of the work-function template h-BN/Cu(111) [2]. Tunneling spectroscopy shows that the charge state of F16CoPc can be controlled by three parameters: (i) template-induced gating by the work-function variation of h-BN/Cu(111) [2], (ii) field-induced gating by the STM tip [3] and (iii) screening, which depends on the neighboring molecules [4]. These parameters influence the properties of the molecular layer and thus its (templating) functionality. For example the preferred adsorption positions of second layer molecules differ from the first layer.
[1] Kumar, et al., Nanotechnology 28, 082001 (2017).
[2] Joshi, et al., ACS Nano 8, 430 (2014).
[3] Liu, et al., ASC Nano 9, 10125 (2015).
[4] Cochrane, et al., Nat. Commun. 6, 8312 (2015).