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Thermoelectric power factor: Enhancement mechanisms and strategies for higher performance thermoelectric materials

机译:热电功率因数:高性能热电材料的增强机制和策略

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摘要

Thermoelectric research has witnessed groundbreaking progress over the past 15-20 years. The thermoelectric figure of merit, ZT, a measure of the competition between electronic transport (i.e. power factor) and thermal transport (i.e. total thermal conductivity), has long surpassed once a longtime barrier of ~1 and thermoelectric scientists are targeting ZT> 2 as the new goal. A majority of this recent improvement in ZT has been achieved through the reduction of lattice part of thermal conductivity (K_l) using nanostructuring techniques. The rapid progress in this direction focused the efforts on the development of experimental methods and understanding phonon transport to decrease lattice thermal conductivity. This fact left the development of ideas to improve electronic transport and thermoelectric power factor rather overlooked. With thermal conductivity of the potential thermoelectrics approaching the minimum theoretical limit, on the journey to higher ZT values, a paradigm shift is necessary toward the enhancement of the thermoelectric power factor. This article discusses the ideas and strategies proposed and developed in order to improve the thermoelectric power factor and thus hopefully move us closer to the target of a ZT > 2!
机译:热电研究见证了过去15-20年中的突破性进展。 ZT是衡量电子传输(即功率因数)与热传输(即总热导率)之间竞争关系的一种度量标准,它的长期热阻一旦长期达到〜1便已超过,热电科学家将ZT> 2作为目标新目标。通过使用纳米结构技术降低热导率(K_1)的晶格部分,可以实现ZT的最新改进。在这个方向上的快速进展集中精力在实验方法的开发和理解声子传输以降低晶格导热率上。这一事实使人们对改善电子传输和热电功率因数的想法的发展被忽视了。随着潜在热电元件的热导率接近最小理论极限,在向更高的ZT值过渡的过程中,必须朝着提高热电功率因数的方向转变。本文讨论了为提高热电功率因数而提出和发展的思想和策略,从而有望使我们更接近ZT> 2的目标!

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