Controlling destructive quantum interference in tunneling junctions comprising self-assembled monolayers via bond topology and functional groups

Yanxi Zhang, G. Ye, S. Soni, X. Qiu, T.L. Krijger, H.T. Jonkman, M. Carlotti, E. Sauter, M. Zharnikov, R.C. Chiechi*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)

Abstract

Quantum interference effects (QI) are of interest in nano-scale devices based on molecular tunneling junctions because they can affect conductance exponentially through minor structural changes. However, their utilization requires the prediction and deterministic control over the position and magnitude of QI features, which remains a significant challenge. In this context, we designed and synthesized three benzodithiophenes based molecular wires; one linearly-conjugated, one cross-conjugated and one cross-conjugated quinone. Using eutectic Ga–In (EGaIn) and CP-AFM, we compared them to a well-known anthraquinone in molecular junctions comprising self-assembled monolayers (SAMs). By combining density functional theory and transition voltage spectroscopy, we show that the presence of an interference feature and its position can be controlled independently by manipulating bond topology and electronegativity. This is the first study to separate these two parameters experimentally, demonstrating that the conductance of a tunneling junction depends on the position and depth of a QI feature, both of which can be controlled synthetically.
Original languageEnglish
Pages (from-to)4414-4423
JournalChemical science
Volume9
Issue number19
DOIs
Publication statusPublished - 23 Apr 2018
Externally publishedYes

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