Internal Electric Field Modulation in Molecular Electronic Devices by Atmosphere and Mobile Ions

Journal of the American Chemical Society
Prakash Chandra MondalRichard L McCreery

Abstract

The internal potential profile and electric field are major factors controlling the electronic behavior of molecular electronic junctions consisting of ∼1-10 nm thick layers of molecules oriented in parallel between conducting contacts. The potential profile is assumed linear in the simplest cases, but can be affected by internal dipoles, charge polarization, and electronic coupling between the contacts and the molecular layer. Electrochemical processes in solutions or the solid state are entirely dependent on modification of the electric field by electrolyte ions, which screen the electrodes and form the ionic double layers that are fundamental to electrode kinetics and widespread applications. The current report investigates the effects of mobile ions on nominally solid-state molecular junctions containing aromatic molecules covalently bonded between flat, conducting carbon surfaces, focusing on changes in device conductance when ions are introduced into an otherwise conventional junction design. Small changes in conductance were observed when a polar molecule, acetonitrile, was present in the junction, and a large decrease of conductance was observed when both acetonitrile (ACN) and lithium ions (Li+) were present. Transient...Continue Reading

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Citations

Jul 23, 2019·Physical Chemistry Chemical Physics : PCCP·Colin Van DyckGino A DiLabio
Jun 3, 2020·Nature Materials·Yingmei HanChristian A Nijhuis
May 8, 2020·Physical Chemistry Chemical Physics : PCCP·Adriano SantosPaulo R Bueno
Oct 6, 2020·Chemistry, an Asian Journal·Yingmei Han, Christian Albertus Nijhuis
Jun 23, 2020·Journal of the American Chemical Society·Mustafa SupurRichard L McCreery
Oct 16, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Bai SunQunliang Song

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