Issue 9, 2019

Optimized orientation and enhanced thermoelectric performance in Sn0.97Na0.03Se with Te addition

Abstract

Na doped SnSe shows excellent electronic properties and ultralow thermal conductivity, leading to a record high ZT value in its single crystal. Owing to weak orientation, polycrystalline SnSe shows a lower electrical conductivity and power factor. In this work, additional Te is introduced in the process of sample preparation to increase the orientation of polycrystalline Sn0.97Na0.03Se. The orientation obviously improves with the increase of Te amount, leading to a great improvement of the electronic properties, especially in the low temperature region. An enhanced averaged power factor (∼6.01 μW cm−1 K−2) and ZT (∼0.45) from 300 to 830 K are achieved. A maximum ZT value of 0.8 at 830 K is obtained in Sn 0.97Na0.03Se with 5 wt% additional Te.

Graphical abstract: Optimized orientation and enhanced thermoelectric performance in Sn0.97Na0.03Se with Te addition

Supplementary files

Article information

Article type
Paper
Submitted
26 Dec 2018
Accepted
30 Jan 2019
First published
31 Jan 2019

J. Mater. Chem. C, 2019,7, 2653-2658

Optimized orientation and enhanced thermoelectric performance in Sn0.97Na0.03Se with Te addition

J. Zhang, J. Xu, X. Tan, H. Wang, G. Liu, H. Shao, B. Yu, S. Yue and J. Jiang, J. Mater. Chem. C, 2019, 7, 2653 DOI: 10.1039/C8TC06545D

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