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

doi: 10.3390/en13030643
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.
- MDPI Switzerland
- MDPI (Multidisciplinary Digital Publishing Institute) Switzerland
- LINK - Laboratory for Innovative Key Materials and Structures Japan
- MDPI
- University of Tsukuba Japan
suppressed thermal transport, Technology, enhanced power factor, T, GeTe, LiI as dopant, [CHIM] Chemical Sciences, [CHIM]Chemical Sciences, gete, lii as dopant, thermoelectrics
suppressed thermal transport, Technology, enhanced power factor, T, GeTe, LiI as dopant, [CHIM] Chemical Sciences, [CHIM]Chemical Sciences, gete, lii as dopant, thermoelectrics
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