Nanoscale self-assembly of thermoelectric materials: a review of chemistry-based approaches
Nanoscale self-assembly of thermoelectric materials: a review of chemistry-based approaches
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DOI：
10.1088/1361-6528/aad673
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发表时间：
2018-08
期刊：
影响因子：
3.5
通讯作者：
Sajad Yazdani;M. Pettes
中科院分区：
文献类型：
--
作者：
Sajad Yazdani;M. Pettes
本文综述了自底向上制备热电能量互转换材料的主要方法。从材料合成的角度调查了优势、能力和挑战，并讨论了这些方法在改善（或可能恶化）与应用相关的传输特性方面的潜力。基于纳米线、量子点、介孔、水/溶剂热和微波辅助合成的报道过程，从热电应用的角度重新评估了基于溶液化学的合成方法，因为这些技术可以有效地用于工业大规模生产。就能量转换效率而言，自组装的好处可以从三个途径出现：抑制导热性，增加热功率和提高导电性。理想的热电材料同时受益于这三种改进。与自上而下（固态）的材料相比，大多数自下而上的材料表现出非常低的导热系数，尽管主要的挑战在于改善其糟糕的电性能。本综述讨论的领域的最新发展表明，将自下而上的热电材料视为性能差的劣质材料的传统观点是不合适的。由于尺寸和能量过滤效应、电导率增强以及自底向上纳米级自组装合成中固有的热导率降低机制而产生的热功率增强表明了这些技术将在未来热电应用中发挥的影响。
This review is concerned with the leading methods of bottom-up material preparation for thermal-to-electrical energy interconversion. The advantages, capabilities, and challenges from a material synthesis perspective are surveyed and the methods are discussed with respect to their potential for improvement (or possibly deterioration) of application-relevant transport properties. Solution chemistry-based synthesis approaches are re-assessed from the perspective of thermoelectric applications based on reported procedures for nanowire, quantum dot, mesoporous, hydro/solvothermal, and microwave-assisted syntheses as these techniques can effectively be exploited for industrial mass production. In terms of energy conversion efficiency, the benefit of self-assembly can occur from three paths: suppressing thermal conductivity, increasing thermopower, and boosting electrical conductivity. An ideal thermoelectric material gains from all three improvements simultaneously. Most bottom-up materials have been shown to exhibit very low values of thermal conductivity compared to their top-down (solid-state) counterparts, although the main challenge lies in improving their poor electrical properties. Recent developments in the field discussed in this review reveal that the traditional view of bottom-up thermoelectrics as inferior materials suffering from poor performance is not appropriate. Thermopower enhancement due to size and energy filtering effects, electrical conductivity enhancement, and thermal conductivity reduction mechanisms inherent in bottom-up nanoscale self-assembly syntheses are indicative of the impact that these techniques will play in future thermoelectric applications.