Progress of microscopic thermoelectric effects studied by micro- and nano-thermometric techniques
Progress of microscopic thermoelectric effects studied by micro- and nano-thermometric techniques
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微纳米测温技术研究微观热电效应的进展
DOI：
10.1007/s11467-021-1101-x
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发表时间：
2021-07
影响因子：
7.5
通讯作者：
Zhenghua An
中科院分区：
文献类型：
--
作者：
Xue Gong;Ruijie Qian;Huanyi Xue;Weikang Lu;Zhenghua An
随着现代集成电子器件尺寸的不断减小，散热问题已成为最严重的问题之一。大部分消耗的功率不可避免地以废热的形式耗散，这不仅制约了设备本身的能效性能，也导致了严重的环境问题和能源危机。热电塞贝克效应是一种绿色能量回收方法，而热电珀耳帖效应可用于热管理，通过主动冷却过热的设备，其中通过热传导的被动冷却是不够的。然而，由于热电转换效率低，对微观层次的热电现象缺乏深入的了解，限制了热电技术的应用。因此，探测和管理热电是非常重要的，特别是在纳米尺度。在这篇简短的评论中，我们将首先简要介绍研究纳米热电的显微技术，主要集中在扫描热显微镜（SThM）。SThM是一个强大的工具，映射的晶格热与纳米空间分辨率，从而检测纳米尺度的热输运和耗散过程。然后，我们将回顾最近的实验，利用这些技术来研究热电在各种纳米材料系统，包括（两种材料）异质结和（单一材料）同质结定制塞贝克系数，也自旋塞贝克和珀尔帖效应的磁性材料。接下来，我们将提供我们最近开发的扫描噪声显微镜（SNoiM）直接探测热电器件中的非平衡传输热电荷（而不是晶格热）的前景广阔的应用前景。SNoiM与SThM一起有望能够提供更完整和全面的理解热电的微观机制。最后，对热电材料微观研究的发展进行了总结和展望。
Heat dissipation is one of the most serious problems in modern integrated electronics with the continuously decreasing devices size. Large portion of the consumed power is inevitably dissipated in the form of waste heat which not only restricts the device energy-efficiency performance itself, but also leads to severe environment problems and energy crisis. Thermoelectric Seebeck effect is a green energy-recycling method, while thermoelectric Peltier effect can be employed for heat management by actively cooling overheated devices, where passive cooling by heat conduction is not sufficiently enough. However, the technological applications of thermoelectricity are limited so far by their very low conversion efficiencies and lack of deep understanding of thermoelectricity in microscopic levels. Probing and managing the thermoelectricity is therefore fundamentally important particularly in nanoscale. In this short review, we will first briefly introduce the microscopic techniques for studying nanoscale thermoelectricity, focusing mainly on scanning thermal microscopy (SThM). SThM is a powerful tool for mapping the lattice heat with nanometer spatial resolution and hence detecting the nanoscale thermal transport and dissipation processes. Then we will review recent experiments utilizing these techniques to investigate thermoelectricity in various nanomaterial systems including both (two-material) heterojunctions and (single-material) homojunctions with tailored Seebeck coefficients, and also spin Seebeck and Peltier effects in magnetic materials. Next, we will provide a perspective on the promising applications of our recently developed Scanning Noise Microscope (SNoiM) for directly probing the non-equilibrium transporting hot charges (instead of lattice heat) in thermoelectric devices. SNoiM together with SThM are expected to be able to provide more complete and comprehensive understanding to the microscopic mechanisms in thermoelectrics. Finally, we make a conclusion and outlook on the future development of microscopic studies in thermoelectrics.
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影响因子：
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通讯作者：
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通讯作者：
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影响因子：
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