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Communication

Is LiI a Potential Dopant Candidate to Enhance the Thermoelectric Performance in Sb-Free GeTe Systems? A Prelusive Study

1
CNRS-Saint Gobain-NIMS, UMI 3629, Laboratory for Innovative Key Materials and Structures (LINK), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan
2
Center for Functional Sensor & Actuator (CFSN) & WPI Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan
3
Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8671, Japan
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(3), 643; https://doi.org/10.3390/en13030643
Received: 29 November 2019 / Revised: 22 January 2020 / Accepted: 30 January 2020 / Published: 3 February 2020
As a workable substitute for toxic PbTe-based thermoelectrics, GeTe-based materials are emanating as reliable alternatives. To assess the suitability of LiI as a dopant in thermoelectric GeTe, a prelusive study of thermoelectric properties of GeTe1−xLiIx (x = 0–0.02) alloys processed by Spark Plasma Sintering (SPS) are presented in this short communication. A maximum thermoelectric figure of merit, zT ~ 1.2, was attained at 773 K for 2 mol% LiI-doped GeTe composition, thanks to the combined benefits of a noted reduction in the thermal conductivity and a marginally improved power factor. The scattering of heat carrying phonons due to the presumable formation of Li-induced “pseudo-vacancies” and nano-precipitates contributed to the conspicuous suppression of lattice thermal conductivity, and consequently boosted the zT of the Sb-free (GeTe)0.98(LiI)0.02 sample when compared to that of pristine GeTe and Sb-rich (GeTe)x(LiSbTe2)2 compounds that were reported earlier. View Full-Text
Keywords: thermoelectrics; GeTe; LiI as dopant; enhanced power factor; suppressed thermal transport thermoelectrics; GeTe; LiI as dopant; enhanced power factor; suppressed thermal transport
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MDPI and ACS Style

Srinivasan, B.; Berthebaud, D.; Mori, T. Is LiI a Potential Dopant Candidate to Enhance the Thermoelectric Performance in Sb-Free GeTe Systems? A Prelusive Study. Energies 2020, 13, 643. https://doi.org/10.3390/en13030643

AMA Style

Srinivasan B, Berthebaud D, Mori T. Is LiI a Potential Dopant Candidate to Enhance the Thermoelectric Performance in Sb-Free GeTe Systems? A Prelusive Study. Energies. 2020; 13(3):643. https://doi.org/10.3390/en13030643

Chicago/Turabian Style

Srinivasan, Bhuvanesh, David Berthebaud, and Takao Mori. 2020. "Is LiI a Potential Dopant Candidate to Enhance the Thermoelectric Performance in Sb-Free GeTe Systems? A Prelusive Study" Energies 13, no. 3: 643. https://doi.org/10.3390/en13030643

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