热电效应
纳米-
材料科学
热电材料
纳米技术
凝聚态物理
化学工程
复合材料
热导率
热力学
物理
工程类
作者
Guipeng Li,Guihong Song,Nan Wang,Yusheng Wu,Hao Du,Jinyuan You,Hangzhou Zhang
标识
DOI:10.1016/j.jallcom.2022.167432
摘要
The β-Cu2+xSe/a-C nano-multilayer films were prepared. The carrier concentration, mobility and thermal conductivity decrease and the resistivity and Seebeck coefficient increase with reducing the modulation periods. For the β-Cu2+xSe/a-C nano-multilayer film with the lowest modulation period 160 nm, the power factor and ZT value reach 0.57 mW·m−1·K−2 and 0.42 at room temperature, respectively. Enhanced power factor and ZT values in the nano-multilayer films are attributed to scattering effect of the depletion layer at the β-Cu2+xSe/a-C interface that decreases the carrier concentration and mobility. The existence of the heterogeneous interface effectively increases the Seebeck coefficient and decreases thermal conductivity due to increasing the scattering effect of carriers and phonons. The introduction of a-C layer with high electric conduction into β-Cu2+xSe to form β-Cu2+xSe/a-C nano-multilayer film can effectively improve its thermoelectric properties.
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