Harnessing Quantum Interference in Molecular Dielectric Materials
- Northwestern Univ., Evanston, IL (United States)
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
Web of Science
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Related Subjects
catalysis (homogeneous)
solar (photovoltaic)
bio-inspired
charge transport
mesostructured materials
materials and chemistry by design
synthesis (novel materials)
synthesis (self-assembly)
molecular dielectric material
quantum interference
density functional theory
nonequilibrium quantum transport