Molecular Conformation in Charge Tunneling across Large-Area Junctions

Date
2021-08-20
Authors
VanVeller, Brett
Du, Chuanshen
Norris, Sean
Thakur, Abhishek
Chen, Jiahao
VanVeller, Brett
Thuo, Martin
Thuo, Martin
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Chemistry
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Electrical and Computer EngineeringMaterials Science and EngineeringChemistryCenter for Bioplastics and BiocompositesMicroelectronics Research Center (MRC)
Abstract

Self-assembled monolayers are predicated on thermodynamic equilibrium; hence, their properties project accessible relaxation pathways. Herein, we demonstrate that charge tunneling correlates with conformational degrees of freedom(s). Results from open chain and cyclic head groups show that, as expected, distribution in tunneling data correlates with the orientation of the head group, akin to the odd–even effect and more importantly the degree of conformational freedom, but fluctuates with applied bias. Trends in nature of distributions in current density illuminate the need for higher statistical moments in understanding these rather dynamic systems. We employ skewness, kurtosis, and estimation plots to show that the conformational degree of freedom in the head group significantly amplifies the odd–even effect and may lead to enhanced or perturbed tunneling based on whether the head group is on an odd- or even-parity spacer.

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This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Journal of the American Chemical Society, copyright © American Chemical Society after peer review. To access the final edited and published work see DOI: 10.1021/jacs.1c06622 Posted with permission.

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