Thermoelectric Properties of Pure SnSe Single Crystal Prepared by a Vapor Deposition Method

As a promising eco‐friendly high‐performance thermoelectric material, SnSe single crystal has attracted much attention during the past several years. In this work, SnSe single crystal is prepared through a novel vapor deposition method in which polycrystalline SnSe is volatilized on a hot side (800–850 °C) and single‐crystalline SnSe spontaneously nucleates on the cold side (500–650 °C) based on the inside wall of a quartz ampoule. This crystal growth technique is beneficial for obtaining high‐purity SnSe crystal as some metal ions, such as Li+, Na+, and K+, in the quartz ampoule will be restricted from diffusing into the material. SnSe single crystal along the a‐axis is measured to experience a Pnma–Cmcm phase transition around 800 K where power factor (PF) exhibits the highest value of 6.2 µW cm−1 K−2 and total thermal conductivity ktot shows the lowest value of 0.48 W m−1 K−1. Accordingly, SnSe single crystal reaches a maximum ZT = 0.98 near phase transition temperature. These results not only provide an effective approach for pure SnSe single crystal fabrication, but also reveal the intrinsic electronic and phononic transport properties of thermoelectric SnSe.

[1]  M. Kanatzidis,et al.  High thermoelectric performance in Bi0.46Sb1.54Te3 nanostructured with ZnTe , 2018 .

[2]  Yue Chen,et al.  3D charge and 2D phonon transports leading to high out-of-plane ZT in n-type SnSe crystals , 2018, Science.

[3]  Jun Jiang,et al.  Charge Transport in Thermoelectric SnSe Single Crystals , 2018 .

[4]  Jun Jiang,et al.  Growth and characterization of large size undoped p-type SnSe single crystal by Horizontal Bridgman method , 2017 .

[5]  Jun Jiang,et al.  Single crystal growth of Sn0.97Ag0.03Se by a novel horizontal Bridgman method and its thermoelectric properties , 2017 .

[6]  J. E. Lee,et al.  Achieving ZT=2.2 with Bi-doped n-type SnSe single crystals , 2016, Nature Communications.

[7]  D. Ory,et al.  Fatty acid synthesis configures the plasma membrane for inflammation in diabetes , 2016, Nature.

[8]  C. Uher,et al.  Broad temperature plateau for high ZTs in heavily doped p-type SnSe single crystals , 2016 .

[9]  Jun Jiang,et al.  Enhanced thermoelectric performance in p-type polycrystalline SnSe benefiting from texture modulation , 2016 .

[10]  Heng Wang,et al.  Ultrahigh power factor and thermoelectric performance in hole-doped single-crystal SnSe , 2016, Science.

[11]  Dipanshu Bansal,et al.  Orbitally driven giant phonon anharmonicity in SnSe , 2015, Nature Physics.

[12]  Y. Sung,et al.  Growth mechanism of vertically aligned SnSe nanosheets via physical vapour deposition , 2014 .

[13]  M. Kanatzidis,et al.  Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals , 2014, Nature.

[14]  M. Kanatzidis,et al.  High-performance bulk thermoelectrics with all-scale hierarchical architectures , 2012, Nature.

[15]  Heng Wang,et al.  Lead telluride alloy thermoelectrics , 2011 .

[16]  Xinbing Zhao,et al.  Microstructure and thermoelectric properties of SiGe-added higher manganese silicides , 2010 .

[17]  Jianlin Yu,et al.  Experimental study on low-temperature waste heat thermoelectric generator , 2009 .

[18]  E. Toberer,et al.  Complex thermoelectric materials. , 2008, Nature materials.

[19]  A. Agarwal,et al.  Growth and thermal studies of SnSe single crystals , 2007 .

[20]  Thierry Caillat,et al.  Thermoelectric Materials for Space and Automotive Power Generation , 2006 .

[21]  F. Disalvo,et al.  Thermoelectric cooling and power generation , 1999, Science.

[22]  J. Pannetier,et al.  Neutron diffraction study of the structural phase transition in SnS and SnSe , 1986 .