Thermoelectric properties of copper selenide with ordered selenium layer and disordered copper layer

By Bo Yu, Weishu Liu, Shuo Chen, Hui Wang, Hengzhi Wang, Gang Chen, Zhifeng Ren. 2012

299 citations recorded by the source corpus.

Abstract Thermoelectric figure-of-merit (ZT) of ∼1.6 at 700 °C is achieved in β-phase copper selenide (Cu2Se) made by ball milling and hot pressing. The β-phase of such material possesses a natural superlattice-like structure that combines ordered selenium (Se) and disordered copper (Cu) layers in its unit cell, resulting in a low lattice thermal conductivity of 0.4–0.5 W m−1 K−1. A λ-shaped specific heat peak indicates a phase transition from cubic β-phase to tetragonal α-phase at around 140 °C upon cooling and vice versa. An abnormal decrease in specific heat with increasing temperature was also observed due to the increased random motion of disordered Cu atoms. These features indicate that β-phase Cu2Se could be potentially an interesting thermoelectric material, competing with other conventional thermoelectric materials.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/9b7c34cfaa820a501ea4494083bd51f4031aa8b2

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

1. Xun Shi
2. Lidong Chen
3. C. Uher
4. P. Qiu
5. Li-dong Zhao

In Materials Chemistry

1. Xun Shi
2. Lidong Chen
3. C. Uher
4. P. Qiu
5. Weishu Liu
6. Kunpeng Zhao
7. B. Ge
8. Dudi Ren

Citations in the corpus

• Recent advances in high-performance bulk thermoelectric materials (2016, background): “This has been observed recently in copper selenide (Cu2Se) with a multiformity of Cu ordering on the nanoscales.(109,110) An alternative and, in a sense, extreme example of microstructural tailoring is to form a mosaic architecture.”
• New trends, strategies and opportunities in thermoelectric materials: A perspective (2017, background): “Cu2Se was another notable example for low klat compounds without large unit cell [65,66], in which the loosely bound Cu ions behaved as a “liquid” and resulted in reduced heat capacity.”