Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 74: Organic Molecules at Surfaces 5: Molecular Switches
O 74.1: Vortrag
Donnerstag, 8. September 2022, 15:00–15:15, S054
Reprogrammable molecular memory array based on chemical switching — •Tobias Birk1, Anja Bauer1, Fabian Paschke1, Rainer Winter2, and Mikhail Fonin1 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 2Fachbereich Chemie, Universität Konstanz, 78457 Konstanz, Germany
Technology on a molecular base promises highly interesting innovations for ultra-dense information storage devices and molecular electronics. Recently, a molecular three-state switch based on triazatruxene (TAT) on Ag(111) has been shown to have a great potential as data storage unit [1].
Here, we demonstrate the precise manipulation of the switching characteristics of individual TAT molecules within a 2D array using a low temperature scanning tunneling microscope (STM). By using the tip of the STM and the field applied within the contact, a successive pinning of the molecule via alkyl groups is achieved, leading to a gradual suppression of the current induced molecular switching. The possibility to reversibly switch between differently pinned molecules in combination with the three-level switching of the unpinned molecule offers the possibility to realize 9 states on a single molecule. We also demonstrate that the intermolecular interaction between the switches within the 2D array leads to a strong increase of the number of states, which can be detected on a single TAT unit, yielding up to 24 distinguishable states.
[1] A. Bauer et al., Adv. Mater 32, 1907390 (2020)