期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 130, 期 51, 页码 17309-17319出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja804399q
关键词
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资金
- NSF-Chemistry [CHF-0719420, CHE-0414554, CHE-0718928]
- NSF-MRSEC [DMR-0520513]
- ONR-Chernistry
- American Australian Foundation
Molecular electronics is partly driven by the goal of producing active electronic elements that rival the performance of their solid-state counterparts, but on a much smaller size scale. We investigate what constitutes an ideal switch or molecular device, and how it can be designed, by analyzing transmission plots. The interference features in cross-conjugated molecules provide a large dynamic range in electron transmission probability, opening a new area for addressing electronic functionality in molecules. This large dynamic range is accessible through changes in electron density alone, enabling fast and stable switching, Using cross-conjugated molecules, we show how the width, depth, and energetic location of the interference features can be controlled. In an example of a single molecule transistor, we calculate a change in conductance of 8 orders of magnitude with an applied gate voltage. Using multiple interference features, we propose and calculate the current/voltage behavior of a molecular rectifier with a rectification ratio of >150 000. We calculate a purely electronic negative differential resistance behavior, suggesting that the large dynamic range in electron transmission probability caused by quantum interference could be exploited in future electronic devices.
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