Structure and thermoelectric properties of 2D Cr2Se3−3xS3x solid solutions. Issue 4 (9th January 2018)

• Record Type: Journal Article
• Authors: Zhang, Tingting; Su, Xianli; Yan, Yonggao; Liu, Wei; You, Yonghui; Xie, Hongyao; Yang, Dongwang; Uher, Ctirad; Tang, Xinfeng
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 4(2017)
• Page Start: 836
• Page End: 846
• Publication Date: 2018-01-09
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc04749e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : S substitution improves the ZT value of Cr2 Se3−3 x S3 x which has a two-dimensional layered structure by 32%. Abstract : Chromium selenide (Cr2 Se3 ), consisting of earth-abundant elements, is a new cost-efficient thermoelectric material. In this study, a series of Cr2 Se3−3 x S3 x ( x = 0–0.1) solid solutions was synthesized by solid-state reaction combined with the spark plasma sintering (SPS) process. The correlation between sulphur substituted on selenium sites, the structure, and the thermoelectric properties of Cr2 Se3−3 x S3 x solid solutions was systematically investigated. The solubility limit of S in Cr2 Se3−3 x S3 x is about 10%. Through S substitutions, the band gap has been widened, the Seebeck coefficient has been effectively increased, and the lattice thermal conductivity has been substantially decreased. Mainly due to the remarkable decrease in the lattice thermal conductivity, the ZT values of Cr2 Se3−3 x S3 x ( x = 0–0.1) solid solutions have been increased. The maximum ZT value of 0.29 has been achieved at 623 K for the Cr2 Se2.7 S0.3 compound, which is 32% higher than the ZT value of pure Cr2 Se3 .