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Issue 35, 2018
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Doubling the ZT record of TiS2-based thermoelectrics by incorporation of ionized impurity scattering

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Abstract

1T-type TiS2 has been recognized as a promising environmentally friendly thermoelectric material with a record ZT of around 0.4 so far. We hereby report the high thermoelectric performance of a series of TiS2xAgSnSe2 composites with nano-AgSnSe2 as an ionized impurity for electron scattering. Electrical conductivities (σ) in the composites increased possibly due to intercalation; moreover, they showed an exceptional power law decay of σTm with m much increased in the temperature range of 400–580 K due to a significant contribution of ionized impurity scattering. Correspondingly, Seebeck coefficients (S) experience a much faster growth from ∼450 K to approach and even surpass that in pristine TiS2. The simultaneous enhancement of σ and S enabled a high power factor of ∼1.55 mW m−1 K−1 at 700 K. Besides, the lattice thermal conductivity was effectively reduced due to enhanced phonon scattering and intercalations, almost by half from 1.9 W m−1 K−1 to 1.0 W m−1 K−1 at 700 K. These synergistic effects renewed the record of ZT for TiS2-based thermoelectrics by almost doubling it to ∼0.8 at 700 K in the TiS2–4%AgSnSe2 composite.

Graphical abstract: Doubling the ZT record of TiS2-based thermoelectrics by incorporation of ionized impurity scattering

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Publication details

The article was received on 23 Feb 2018, accepted on 09 Aug 2018 and first published on 10 Aug 2018


Article type: Communication
DOI: 10.1039/C8TC00914G
Citation: J. Mater. Chem. C, 2018,6, 9345-9353
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    Doubling the ZT record of TiS2-based thermoelectrics by incorporation of ionized impurity scattering

    Y. Wang, L. Pan, C. Li, R. Tian, R. Huang, X. Hu, C. Chen, N. Bao, K. Koumoto and C. Lu, J. Mater. Chem. C, 2018, 6, 9345
    DOI: 10.1039/C8TC00914G

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