中国物理B ›› 2018, Vol. 27 ›› Issue (4): 47202-047202.doi: 10.1088/1674-1056/27/4/047202
所属专题: SPECIAL TOPIC — Recent advances in thermoelectric materials and devices
• TOPIC REVIEW—Thermal and thermoelectric properties of nano materials • 上一篇 下一篇
Zhiyu Chen(陈志禹), Ruifeng Wang(王瑞峰), Guoyu Wang(王国玉), Xiaoyuan Zhou(周小元), Zhengshang Wang(王正上), Cong Yin(尹聪), Qing Hu(胡庆), Binqiang Zhou(周斌强), Jun Tang(唐军), Ran Ang(昂然)
Zhiyu Chen(陈志禹)1, Ruifeng Wang(王瑞峰)2,3, Guoyu Wang(王国玉)2,3, Xiaoyuan Zhou(周小元)4, Zhengshang Wang(王正上)1, Cong Yin(尹聪)1, Qing Hu(胡庆)1, Binqiang Zhou(周斌强)5, Jun Tang(唐军)1,6, Ran Ang(昂然)1,6
摘要: We have systematically studied the thermoelectric properties in Zn-doped SnTe. Strikingly, band convergence and embedded precipitates arising from Zn doping, can trigger a prominent improvement of thermoelectric performance. In particular, the value of dimensionless figure of merit zT has increased by 100% and up to~0.5 at 775 K for the optimal sample with 2% Zn content. Present findings demonstrate that carrier concentration and effective mass play crucial roles on the Seebeck coefficient and power factor. The obvious deviation from the Pisarenko line (Seebeck coefficient versus carrier concentration) due to Zn-doping reveals the convergence of valence bands. When the doping concentration exceeds the solubility, precipitates occur and lead to a reduction of lattice thermal conductivity. In addition, bipolar conduction is suppressed, indicating an enlargement of band gap. The Zn-doped SnTe is shown to be a promising candidate for thermoelectric applications.
中图分类号: (Thermoelectric and thermomagnetic effects)