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O: Fachverband Oberflächenphysik

O 28: Organic Molecules on Inorganic Substrates I: Switching and Manipulation

O 28.5: Vortrag

Dienstag, 2. April 2019, 11:30–11:45, H24

Controlled consecutive charging of self-assembled clusters of molecules — •Philipp Scheuerer and Jascha Repp — University of Regensburg, Regensburg, Germany

Molecular self-assembly on insulating films [1] or insulators is a promising approach to create functional molecular structures as building blocks for future electronics. Controlled manipulation of single electrons in such structures as recently demonstrated for individual weakly coupled molecules on insulating films [2], represents an important step to understanding intermolecular electronic interactions.

Here, we investigate the charge transfer in self-assembled molecular structures of Perylenetetracarboxylic dianhydride (PTCDA) molecules on thick insulating films. By applying a bias voltage between the tip of a non-contact atomic force microscope and the underlying conductive sample we inject charges into small molecular clusters with single-electron control. Making use of the sensitivity of AFM to detect single electrons we locate the position of charges within clusters. Depending on the number of injected charges either stable charge configurations or tip-induced motion of charges within the island is observed. The latter leads to a damping signal with a pronounced spatial signature.

[1] S. Burke et al., Nature Communications 6, 8312 (2015)

[2] W. Steurer et al., Nature Communications 6, 8353 (2015)