Length-Dependent Conductance of Oligothiophenes

被引：127
作者：
Capozzi, Brian [1 ]
Dell, Emma J. [2 ]
Berkelbach, Timothy C. [2 ]
Reichman, David R. [2 ]
Venkataraman, Latha [1 ]
Campos, Luis M. [2 ]
机构：
[1] Columbia Univ, Dept Appl Phys & Math, New York, NY 10027 USA
[2] Columbia Univ, Dept Chem, New York, NY 10027 USA
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2014年 / 136卷 / 29期
基金：
美国国家科学基金会;
关键词：
SINGLE-MOLECULE CONDUCTANCE; METAL WORK FUNCTION; ELECTRICAL CONDUCTANCE; ALPHA; OMEGA-SUBSTITUTED OLIGOTHIOPHENES; ORGANIC SEMICONDUCTORS; CONJUGATED POLYMERS; CONTACT RESISTANCE; CHARGE-TRANSPORT; SOLAR-CELLS; JUNCTIONS;
D O I：
10.1021/ja505277z
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We have measured the single-molecule conductance of a family of oligothiophenes comprising 1-6 thiophene moieties terminated with methyl-sulfide linkers using the scanning tunneling microscope-based break-junction technique. We find an anomalous behavior: the peak of the conductance histogram distribution does not follow a clear exponential decay with increasing number of thiophene units in the chain. The electronic properties of the materials were characterized by optical spectroscopy and electrochemistry to gain an understanding of the factors affecting the conductance of these molecules. We postulate that different conformers in the junction are a contributing factor to the anomalous trend in the observed conductance as a function of molecule length.
引用
收藏
页码：10486 / 10492
页数：7
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