Systematic experimental study of quantum interference effects in anthraquinoid molecular wires

Marco Carlotti, Saurabh Soni, Xinkai Qiu, Eric Sauter, Michael Zharnikov, Ryan C. Chiechi*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

In order to translate molecular properties in molecular-electronic devices, it is necessary to create design principles that can be used to achieve better structure-function control oriented toward device fabrication. In molecular tunneling junctions, cross-conjugation tends to give rise to destructive quantum interference effects that can be tuned by changing the electronic properties of the molecules. We performed a systematic study of the tunneling charge-transport properties of a series of compounds characterized by an identical cross-conjugated anthraquinoid molecular skeleton but bearing different substituents at the 9 and 10 positions that affect the energies and localization of their frontier orbitals. We compared the experimental results across three different experimental platforms in both single-molecule and large-area junctions and found a general agreement. Combined with theoretical models, these results separate the intrinsic properties of the molecules from platform-specific effects. This work is a step towards explicit synthetic control over tunneling charge transport targeted at specific functionality in (proto-) devices.

Original languageEnglish
Pages (from-to)2018-2028
Number of pages11
JournalNanoscale advances
Volume1
Issue number5
DOIs
Publication statusPublished - 1-May-2019

Keywords

  • SELF-ASSEMBLED MONOLAYERS
  • TUNNELING JUNCTIONS
  • LARGE-AREA
  • CROSS-CONJUGATION
  • CONDUCTANCE
  • TRANSPORT
  • ELECTRONICS
  • ROBUST
  • EGAIN

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