Single-Metal Nanoscale Thermocouples
Single-Metal Nanoscale Thermocouples
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DOI：
10.1109/tnano.2014.2358532
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发表时间：
2014-09
影响因子：
2.4
通讯作者：
G. Szakmany;A. Orlov;G. Bernstein;W. Porod
中科院分区：
文献类型：
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作者：
G. Szakmany;A. Orlov;G. Bernstein;W. Porod
我们研究了纳米热电偶（TC）形成的单层金属与横截面不连续的热电发电。通常，当第二导体插入第一导体的两个部分之间时形成TC，从而形成位于不同温度下的两个结。在这里，我们调查的行为TC形成的两个导体，而是纳米线的两个横截面面积相同的金属。Monclerton TC构造从光刻定义的纳米线具有一个突然的变化，在宽度沿着其长度，并在室温下进行测试，这些结构利用塞贝克系数的变化，是目前在这些尺寸尺度。为了研究这种“形状工程”TC的热电特性，采用纳米级加热器来设置局部温度。通过模拟和实验确定了热电偶热端和冷端的温度分布。结果表明，开路电压的大小，因此相对塞贝克系数，是在段宽度的变化的参数的函数。这种形状工程化的monoclonal纳米线TC的制造复杂性相比于传统的monoclonal纳米线TC大大降低，并且可以使用更简单的制造技术大规模生产。
We study the generation of thermoelectricity by nanoscale thermocouples (TCs) formed from a single layer of metal with cross-sectional discontinuity. Typically, a TC is formed when a second conductor is inserted between two sections of a first conductor forming two junctions situated at different temperatures. Here, we investigate the behavior of TCs formed not of two conductors but rather nanowires of the same metal of two cross-sectional areas. Monometallic TCs were constructed from a lithographically defined nanowire having one abrupt variation in width along its length, and tested at room temperature; these structures exploit a change in Seebeck coefficient that is present at these size scales. To investigate the thermoelectric properties of such “shape-engineered” TCs, nanoscale heaters were employed to set the local temperatures. Temperature profiles at the hot and cold junctions of the TCs were determined both by simulations and experiments. Results demonstrate that the magnitude of the open-circuit voltage, and hence the relative Seebeck coefficient, is a function of the parameters of the variations in the segment widths. The fabrication complexity of such shape-engineered monometallic nanowire TCs is greatly reduced compared to that of conventional bimetallic TCs, and could be mass-produced using simpler manufacturing techniques.