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Title: Harnessing Quantum Interference in Molecular Dielectric Materials

Journal Article · · ACS Nano

We investigate the relationship between dielectric response and charge transport in molecule-based materials operating in the quantum coherent regime. We find that quantum interference affects these observables differently, for instance, allowing current passing through certain materials to be reduced by orders of magnitude without affecting dielectric behavior (or band gap). As an example, we utilize ab initio electronic structure theory to calculate conductance and dielectric constants of cross-conjugated anthraquinone (AQ)-based and linearly conjugated anthracene (AC)-based materials. In spite of having nearly equal fundamental gaps, electrode bonding configurations, and molecular dimensions, we find a ~1.7 order of magnitude (~50-fold) reduction in the conductance of the AQ-based material relative to the AC-based material, a value in close agreement with recent measurements, while the calculated dielectric constants of both materials are nearly identical. From these results, we propose two molecular materials in which quantum interference is used to reduce leakage currents across a ~25 Å monolayer gap with dielectric constants larger than 4.5.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Bio-Inspired Energy Science (CBES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Belgian American Educational Foundation (BAEF)
Grant/Contract Number:
SC0000989; DMR-1121262
OSTI ID:
1370551
Journal Information:
ACS Nano, Vol. 9, Issue 6; Related Information: CBES partners with Northwestern University (lead); Harvard University; New York University; Pennsylvania State University; University of Michigan; University of Pittsburgh; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (7)

Breakdown of Curly Arrow Rules in Anthraquinone journal October 2018
Transition-Metal-Free Synthesis of Homo- and Hetero-1,2,4-Triaryl Benzenes by an Unexpected Base-Promoted Dearylative Pathway journal April 2016
Chemical principles of single-molecule electronics journal February 2016
Systematic experimental study of quantum interference effects in anthraquinoid molecular wires journal January 2019
Controlling destructive quantum interference in tunneling junctions comprising self-assembled monolayers via bond topology and functional groups journal January 2018
Transition-Metal-Free Synthesis of Homo- and Hetero-1,2,4-Triaryl Benzenes by an Unexpected Base-Promoted Dearylative Pathway journal April 2016
Breakdown of Curly Arrow Rules in Anthraquinone journal November 2018