Roles of lattice cooling on local heating in metal-molecule-metal junctions
Roles of lattice cooling on local heating in metal-molecule-metal junctions
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DOI：
10.1063/1.3353969
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发表时间：
2010-03
影响因子：
4
通讯作者：
M. Tsutsui;M. Taniguchi;Kazumichi Yokota;T. Kawai
中科院分区：
文献类型：
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作者：
M. Tsutsui;M. Taniguchi;Kazumichi Yokota;T. Kawai
我们报告了一个定量评估晶格冷却的有效性，减轻局部加热的电流载流单分子线连接到金纳米电极的高场有效温度在不同的环境温度下的比较分析。我们发现大量的局部加热在苯二硫醇单分子结提高局部温度从周围环境的10320 K到10400 K在0.85 V的强烈的自加热是由于在低温下，导致恶化的热传递在金属分子接触的热导率降低，从而表现出晶格冷却的关键作用，以减轻金属分子金属结过热。
We report a quantitative assessment of the efficacy of lattice cooling on mitigating local heating in a current-carrying single molecule wire connected to gold nanoelectrodes by comparative analyses of high-field effective temperatures at different ambient temperatures. We find substantial local heating in benzenedithiol single molecule junctions raising the local temperatures by ∼320 K from the ambient to ∼400 K at 0.85 V. The intense self-heating are attributable to decreased thermal conductance at low temperatures that leads to deteriorated heat transfer at metal-molecule contacts, thereby manifesting a critical role of lattice cooling for alleviating metal-molecule-metal junction overheating.