Metal-molecule contacts and charge transport across monomolecular layers: Measurement and theory
Metal-molecule contacts and charge transport across monomolecular layers: Measurement and theory
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DOI：
10.1103/physrevlett.89.086802
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发表时间：
2002-08-19
影响因子：
8.6
通讯作者：
Shashidhar, R
中科院分区：
文献类型：
--
作者：
Kushmerick, JG;Holt, DB;Shashidhar, R
提出了使用简单的交叉线隧道结技术在对称和不对称金属分子接触条件下跨分子长度尺度的电荷传输研究。结果表明，低聚（亚苯基乙炔基）是一种共轭有机分子，在对称接触条件下表现得像分子线，但当连接不对称时则表现出分子二极管的特性。为了理解这种行为，我们使用扩展休克尔理论和格林函数方法计算了电流-电压 (I-V) 特性。实验观察到的 I-V 特性与理论具有极好的定性一致性。
Charge transport studies across molecular length scales under symmetric and asymmetric metal-molecule contact conditions using a simple crossed-wire tunnel junction technique are presented. It is demonstrated that oligo(phenylene ethynylene), a conjugated organic molecule, acts like a molecular wire under symmetric contact conditions, but exhibits characteristics of a molecular diode when the connections are asymmetric. To understand this behavior, we have calculated current-voltage (I-V) characteristics using extended Huckel theory coupled with a Green's function approach. The experimentally observed I-V characteristics are in excellent qualitative agreement with the theory.