热电效应
材料科学
热电材料
功勋
三元运算
声子
三元合金
价(化学)
合金
散射
凝聚态物理
调制(音乐)
铜
声子散射
格子(音乐)
光电子学
热导率
热力学
冶金
光学
复合材料
物理
计算机科学
量子力学
声学
程序设计语言
作者
Luping Qu,Luping Qu,Yong Luo,Cong Liu,Zhengliang Du,Lihua Xie,Jiaolin Cui
标识
DOI:10.1021/acsami.4c02739
摘要
CuInTe2 (CIT) is one of the typical ternary chalcogenides known for its characteristic mixed polyanionic/polycationic site defects, making it a subject of continuous interest in the field of thermoelectrics. In this work, we propose a chemical composition modulation strategy for CIT by alloying GeTe and then introducing a copper deficiency (denoted by VCu). This strategy aims to unpin its Fermi level (Fr) and shift Fr into the valence band (VB) while simultaneously enabling coupling between the optical and acoustic phonon, thereby providing an extra phonon scattering path at low frequencies. The simultaneous composition regulations not only enhance the carrier concentration (nH) to 1019–1020 cm–3 but also significantly reduce the lattice thermal conductivity (κL) to ∼0.48 W m–1 K–1, thus effectively realizing electro-acoustic coordination in the present material. As a consequence, the thermoelectric (TE) performance is remarkably improved with the highest TE figure of merit (ZT) of 1.51 at ∼838 K. This value ranks at a higher level among CIT-based materials, which showcases the great significance of chemical composition modulation.
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