The Nature of Transport Variations in Molecular Heterojunction Electronics

被引：97

作者：

Malen, Jonathan A. ^{[1
,6
]}

Doak, Peter ^{[2
,6
]}

Baheti, Kanhayalal ^{[2
,6
]}

Tilley, T. Don ^{[2
,7
]}

Majumdar, Arun ^{[1
,3
,5
,6
]}

Segalman, Rachel A. ^{[3
,4
,6
]}

机构：

[1] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Appl Sci & Technol Program, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA

[5] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA

[7] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2009年 / 9卷 / 10期

关键词：

JUNCTION CONDUCTANCE; AU(111); FLUCTUATION; DEPENDENCE; MONOLAYERS; CHEMISTRY; MECHANISM; FORMALISM; CIRCUITS;

D O I：

10.1021/nl9013875

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Transport fluctuations and variations in a series of metal-molecule metal junctions were quantified through measurements of their thermopower. Thiol bound aromatic molecules of various lengths and degrees of freedom were chosen to understand the magnitude and origins of the variations. Junction thermopower was determined by measuring the voltage difference across molecules trapped between two gold contacts hold at different temperatures. While any given measurement was remarkably stable, the breadth of distributions from repeated measurements Implies variations in the offset of the highest occupied molecular orbital (HOMO) relative to the Fermi Energy of the contacts, similar In magnitude to the nominal offset Itself. Statistical analysis of data shows that these variations are born at the Junction formation, Increase with molecular length, and are dominated by variations in contact geometry and orbital hybridization, as well as intermolecular interactions.

引用

页码：3406 / 3412

页数：7

共 44 条

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