Role of excess tellurium on the electrical and thermal properties in Te-doped paracostibite. Issue 5 (3rd January 2020)

• Record Type: Journal Article
• Authors: Guélou, G.; Failamani, F.; Sauerschnig, P.; Waybright, J.; Suzuta, K.; Mori, T.
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 5(2020)
• Page Start: 1811
• Page End: 1818
• Publication Date: 2020-01-03
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc04840e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The effect of excess Te in the preparation of synthetic mineral paracostibite, CoSbS, was investigated in an attempt to produce a nano–micro-porous architecture. Abstract : The effect of excess Te in the preparation of synthetic mineral paracostibite, CoSbS, was investigated in an attempt to produce a nano–micro-porous architecture. While the latter was found to have no significant impact, we demonstrate that such strategy is a successful approach to enhance both electrical and thermal property via the formation of a more Te-rich paracostibite phase compared with conventional substitution. Tuning of the electrical properties led to a large power factor of 2150 μW m −1 K −2 at 765 K while the lattice thermal conductivity was reduced by ca. 45%, mainly due to an increased electron–phonon scattering. Ultimately, a maximum ZT of 0.45 was achieved, representing a 100% improvement over conventional Te-doped paracostibite.