• Effect of sintering pressure on electrical transport and thermoelectric properties of polycrystalline SnSe

• # Fulltext

https://www.ias.ac.in/article/fulltext/boms/043/0063

• # Keywords

Thermoelectric; tin selenide; texture; spark plasma sintering; sintering pressure.

• # Abstract

Tin selenide (SnSe), which has high thermoelectric (TE) performance due to its low thermal conductivity, is considered as a promising TE material. It is good that TE properties were reported in single crystal form because polycrystalline SnSe exhibits low electrical conductivity compared to that of single crystal SnSe. To improve the electrical conductivity of polycrystalline SnSe, the effects of the pressure applied during spark plasma sintering (SPS) on the electrical charge transport and the TE properties of the polycrystalline SnSe were investigated. Degree of texture was enhanced with increasing sintering pressure from 30 to 120 MPa during SPS, which lead to the increase in carrier mobility, which resultedin the increase in electrical conductivity. Increase in pressure led to a significant increase in thermal conductivity due to an increase in the lattice thermal conductivity, which can be attributed to the decrease in phonon scattering at the grain boundary. A ZT of $\sim$0.7 was obtained at 823 K from the polycrystalline SnSe sintered with a pressure of 60 MPa, which can result from large increase in electrical conductivity with very small increase in the thermal conductivity. This study shows that the TE properties of the polycrystalline SnSe can be enhanced by controlling the degree of texture which can be accomplished by changing the pressure applied during SPS.

• # Author Affiliations

1. Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
2. School of Chemical and Materials Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan
3. Department of Nano Science and Engineering, Kyungnam University, Changwon 51767, Korea
4. Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Korea

• # Bulletin of Materials Science

Volume 44, 2021
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020