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Direct observation of nanoscale switching centers in metal/molecule/metal structures

被引：197
作者：
Lau, CN
Stewart, DR
Williams, RS [1 ]
Bockrath, M
机构：
[1] Hewlett Packard Labs, Palo Alto, CA 94304 USA
[2] CALTECH, Dept Appl Phys, Pasadena, CA 91101 USA
来源：
NANO LETTERS | 2004年 / 4卷 / 04期
关键词：
D O I：
10.1021/nl035117a
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Conductance switching in metal/molecule/metal structures has attracted tremendous and broad interest. Understanding the switching mechanism, which remained controversial to date, will be vital for engineering nanoscale switches crucial for memory and logic applications. Here we describe a new switching mechanism revealed by a novel scanned-probe technique that images the mechano-electrical response of a Pt/ stearic acid/Ti structure switch device. In each image a single switching center, characterized by a nanoscale conductance peak, appeared or disappeared when the device was switched "on" or "off". Our results strongly indicate that the formation and dissolution of individual nanoscale filaments through the molecular layer give rise to conductance switching in our molecular structures with unusually high on/off ratios (similar to10(5)).
引用
收藏
页码：569 / 572
页数：4
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