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arXiv 1708.01591cond-mat.mtrl-scicond-mat.stat-mech
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Seebeck系数的第一性原理热力学理论

First-Principles Thermodynamic Theory of Seebeck Coefficients

Yi Wang, Yong-Jie Hu, Shun-Li Shang, Bi-Cheng Zhou, Zi-Kui Liu, Long-Qing Chen

摘要:

通过塞贝克系数测量的热电效应是指这样的现象,其中施加在热电材料上的温差或梯度引起电电势差或梯度,反之亦然,使得热能和电能能够直接转换。所有现有的理解和第一性原理计算的塞贝克系数已经基于玻尔兹曼动力学输运理论。在这里,我们证明了塞贝克系数是一个定义明确的热力学量,可以确定从由温度变化引起的电子的化学势的变化,因此可以有效地计算单独的基础上的电子态密度通过第一性原理计算在不同的温度。所提出的方法被证明使用原型PbTe和SnSe热电材料。所提出的热力学方法大大简化了Seebeck系数的计算,使得使用高通量第一性原理计算来搜索高性能热电材料成为可能。

英文摘要:

Thermoelectric effects, measured by the Seebeck coefficients, refer to the phenomena in which a temperature difference or gradient imposed across a thermoelectric material induces an electrical potential difference or gradient, and vice versa, enabling the direct conversion of thermal and electric energies. All existing understanding and first-principles calculations of Seebeck coefficients have been based on the Boltzmann kinetic transport theory. Here we demonstrate that the Seebeck coefficient is a well-defined thermodynamic quantity that can be determined from the change in the chemical potential of electrons induced by the temperature change and thus can be efficiently computed solely based on the electronic density of states through first-principles calculations at different temperatures. The proposed approach is demonstrated using the prototype PbTe and SnSe thermoelectric materials. The proposed thermodynamic approach dramatically simplifies the calculations of Seebeck coefficients, making it possible to search for high performance thermoelectric materials using high-throughput first-principles calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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