Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 5, Pages 1811-1818Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc04840e
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Funding
- CREST [JPMJCR15Q6, JPMJCR19Q4]
- JSPS KAKENHI [JP17H02749, JP16H06441, JP19H00833]
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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 mu W 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.
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