期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 1, 页码 16-19出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja409771u
关键词
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资金
- Northwestern University from the U.S. Department of Energy [DE-SC0000989]
- DOE fund of Northwestern University
- Bill and Melinda Gates Foundation [51308]
This paper describes a physical-organic study of the effect of uncharged, polar, functional groups on the rate of charge transport by tunneling across self-assembled monolayer (SAM)-based large-area junctions of the form (AgS)-S-TS(CH2)(n)M(CH2)(m)T//Ga2O3/EGaIn. Here Ag-TS is a template-stripped silver substrate, -M- and -T are middle and terminal functional groups, and EGaIn is eutectic gallium-indium alloy. Twelve uncharged polar groups (-T = CN, CO2CH3, CF3, OCH3, N(CH3)(2), CON(CH3)(2), SCH3, SO2CH3, Br, P(O)(OEt)(2), NHCOCH3, OSi(OCH3)(3)), having permanent dipole moments in the range 0.5 < mu < 4.5, were incorporated into the SAM. A comparison of the electrical characteristics of these junctions with those of junctions formed from n-alkanethiolates led to the conclusion that the rates of charge tunneling are insensitive to the replacement of terminal alkyl groups with the terminal polar groups in this set. The current densities measured in this work suggest that the tunneling decay parameter and injection current for SAMs terminated in nonpolar n-alkyl groups, and polar groups selected from common polar organic groups, are statistically indistinguishable.
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