Boosted carrier mobility and enhanced thermoelectric properties of polycrystalline Na0.03Sn0.97Se by liquid-phase hot deformation. Issue 5 (16th July 2020)

• Record Type: Journal Article
• Authors: Sun, Hao; Tan, Chang; Tan, Xiaojian; Wang, Hongxiang; Yin, Yinong; Song, Yuexin; Liu, Guo-Qiang; Noudem, Jacques G.; Jiang, Quanguo; Zhang, Jianfeng; Huang, Huajie; Jiang, Jun
• Is Part Of: Materials advances. Volume 1:Issue 5(2020)
• Page Start: 1092
• Page End: 1098
• Publication Date: 2020-07-16
• Subjects: 620.11
• DOI: 10.1039/d0ma00405g
• Languages: English
• ISSNs: 2633-5409

Abstract

Abstract : An unconventional liquid-phase hot deformation technique was used to prepare Sn0.97 Na0.03 Se thermoelectric materials, leading to high orientation with good thermoelectric properties. Abstract : SnSe emerges as a promising thermoelectric material due to an ultrahigh ZT value in its single crystal while polycrystalline SnSe offers much lower ZT s resulting from the weak texturing degree. Here, we report a liquid-phase hot deformation technique to enhance the texturing degree of polycrystalline Na0.03 Sn0.97 Se, leading to a significantly boosted carrier mobility of 30.1 cm 2 V −1 s −1 at room temperature and a remarkable average power factor of 5.73 μW cm −1 K −2 between 300 and 830 K. Moreover, the liquid-phase hot deformation procedure introduces dense dislocation defects and realizes an obviously reduced lattice thermal conductivity of 0.40 W m −1 K −1 at 747 K. Consequently, a peak ZT of 0.9 at 780 K and a high average ZT ave of 0.49 from 300 to 830 K were obtained for the polycrystalline Na0.03 Sn0.97 Se sample. This work indicates that liquid-phase hot deformation is a convenient and energy-saving strategy to enhance the texturing degree and improve the thermoelectric performance in polycrystalline SnSe materials.