单分子充电的原子尺度控制

Atomic scale control of single molecule charging.

作者信息

Mikaelian G, Ogawa N, Tu X W, Ho W

机构信息

Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA.

出版信息

J Chem Phys. 2006 Apr 7;124(13):131101. doi: 10.1063/1.2174961.

DOI:10.1063/1.2174961

PMID:16613439

Abstract

A scanning tunneling microscope was used to study charging of single copper phthalocyanine molecules adsorbed on an ultrathin Al(2)O(3) film grown on a NiAl(110) surface. A double-barrier tunnel junction is formed by a vacuum barrier between the tip and the molecule and an oxide barrier between the molecule and the NiAl. In this geometry the molecule can be charged by the tunneling electrons. This charging was found to be strongly dependent on the position of the tip above the molecule and the applied bias voltage.

摘要

利用扫描隧道显微镜研究了吸附在生长于NiAl(110)表面的超薄Al₂O₃薄膜上的单个铜酞菁分子的充电情况。双势垒隧道结由针尖与分子之间的真空势垒以及分子与NiAl之间的氧化物势垒形成。在这种几何结构中，分子可被隧穿电子充电。发现这种充电强烈依赖于针尖在分子上方的位置以及所施加的偏置电压。