Journal
NANO LETTERS
Volume 21, Issue 1, Pages 550-555Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03984
Keywords
Phthalocyanine; Switching; Logic Gate; Coulomb Repulsion; STM; Molecule
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Funding
- Dresden-Wurzburg Center for Topological Quantum Matter Research (ct.qmat)
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This study reports on the controlled assembly of linear clusters consisting of phthalocyanine molecules on an Ag(111) surface. By manipulating the structure of molecules, information can be relayed along molecule chains and used as inputs and outputs in logic gates.
One particularly fascinating vision for charge-operated devices is the controlled assembly of structures from single surface-deposited molecules. Here, we report on the assembly of linear clusters that consist of phthalocyanine (H2Pc) molecules on a Ag(111) surface. The molecules are imaged as well as manipulated with a low-temperature scanning tunneling microscope (STM). Upon deprotonation of every second H2Pc, the resulting HPc molecule exhibits an isomeric bistability which can be used as inputs in logic gates. Combining our STM measurements with density functional theory calculations we show that the HPc isomers exhibit a repulsive electrostatic interaction with adjacent H2Pc molecules which, due to the asymmetric charge distribution on HPc, results in a counterclockwise or clockwise molecule tilt of the latter, thereby defining the logic 0 and 1 of the output. It is shown that information can be relayed along molecule chains over distances equivalent to at least nine molecules.
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