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Enhancement of thermoelectric properties by effective K-doping and nano precipitation in quaternary compounds of (Pb1-xKxTe)(0.70)(PbSe)(0.25)(PbS)(0.05)

Title
Enhancement of thermoelectric properties by effective K-doping and nano precipitation in quaternary compounds of (Pb1-xKxTe)(0.70)(PbSe)(0.25)(PbS)(0.05)
Authors
Ginting, DiantaLin, Chan-ChiehRathnam, LydiaYu, Byung-KyuKim, Sung-JinAl Orabi, Rabih Al RahalRhyee, Jong-Soo
Ewha Authors
김성진
SCOPUS Author ID
김성진scopus
Issue Date
2016
Journal Title
RSC ADVANCES
ISSN
2046-2069JCR Link
Citation
vol. 6, no. 67, pp. 62958 - 62967
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCIE; SCOPUS WOS scopus
Abstract
We investigated thermoelectric properties in K-doped quaternary compounds of (Pb1-xKxTe)(0.70)(PbSe)(0.25)(PbS)(0.05) (x = 0.03). In terms of two valence bands model, we argue that the L-band approaches to the S-band with increasing the K-doping concentration resulting in the increase of carrier concentration and effective mass of carrier due to the increase of band degeneracy. The effective K-doping by x = 0.02 and PbS substitution causes high power factor and low thermal conductivity, resulting in the comparatively high ZT value of 1.72 at 800 K. The low thermal conductivity for (Pb0.98K0.02Te)(0.70)(PbSe)(0.25)(PbS)(0.05) compound is attributed from the lattice distortion and line dislocation in a phase of nano precipitation. By optimizing K-doping and PbS substitution, we achieved the enhancement of practical thermoelectric performance such as average ZT(avg) = 1.08, engineering (ZT)eng = 0.81, maximum efficiency eta max = 11.63%, and output power density P-d = 6.3 W cm(-2), with temperature difference Delta T = 500 K, which has practical applicability in waste heat power generation technologies.
DOI
10.1039/c6ra11299d
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자연과학대학 > 화학·나노과학전공 > Journal papers
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