TY - JOUR
T1 - Defect-Engineering-Stabilized AgSbTe2 with High Thermoelectric Performance
AU - Zhang, Yu
AU - Li, Zhi
AU - Singh, Saurabh
AU - Nozariasbmarz, Amin
AU - Li, Wenjie
AU - Genç, Aziz
AU - Xia, Yi
AU - Zheng, Luyao
AU - Lee, Seng Huat
AU - Karan, Sumanta Kumar
AU - Goyal, Gagan K.
AU - Liu, Na
AU - Mohan, Sanghadasa Mf
AU - Mao, Zhiqiang
AU - Cabot, Andreu
AU - Wolverton, Christopher
AU - Poudel, Bed
AU - Priya, Shashank
N1 - Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/3/16
Y1 - 2023/3/16
N2 - Thermoelectric (TE) generators enable the direct and reversible conversion between heat and electricity, providing applications in both refrigeration and power generation. In the last decade, several TE materials with relatively high figures of merit (zT) have been reported in the low- and high-temperature regimes. However, there is an urgent demand for high-performance TE materials working in the mid-temperature range (400–700 K). Herein, p-type AgSbTe2 materials stabilized with S and Se co-doping are demonstrated to exhibit an outstanding maximum figure of merit (zTmax) of 2.3 at 673 K and an average figure of merit (zTave) of 1.59 over the wide temperature range of 300–673 K. This exceptional performance arises from an enhanced carrier density resulting from a higher concentration of silver vacancies, a vastly improved Seebeck coefficient enabled by the flattening of the valence band maximum and the inhibited formation of n-type Ag2Te, and ahighly improved stability beyond 673 K. The optimized material is used to fabricate a single-leg device with efficiencies up to 13.3% and a unicouple TE device reaching energy conversion efficiencies up to 12.3% at a temperature difference of 370 K. These results highlight an effective strategy to engineer high-performance TE material in the mid-temperature range.
AB - Thermoelectric (TE) generators enable the direct and reversible conversion between heat and electricity, providing applications in both refrigeration and power generation. In the last decade, several TE materials with relatively high figures of merit (zT) have been reported in the low- and high-temperature regimes. However, there is an urgent demand for high-performance TE materials working in the mid-temperature range (400–700 K). Herein, p-type AgSbTe2 materials stabilized with S and Se co-doping are demonstrated to exhibit an outstanding maximum figure of merit (zTmax) of 2.3 at 673 K and an average figure of merit (zTave) of 1.59 over the wide temperature range of 300–673 K. This exceptional performance arises from an enhanced carrier density resulting from a higher concentration of silver vacancies, a vastly improved Seebeck coefficient enabled by the flattening of the valence band maximum and the inhibited formation of n-type Ag2Te, and ahighly improved stability beyond 673 K. The optimized material is used to fabricate a single-leg device with efficiencies up to 13.3% and a unicouple TE device reaching energy conversion efficiencies up to 12.3% at a temperature difference of 370 K. These results highlight an effective strategy to engineer high-performance TE material in the mid-temperature range.
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U2 - 10.1002/adma.202208994
DO - 10.1002/adma.202208994
M3 - Article
C2 - 36566084
AN - SCOPUS:85147513583
SN - 0935-9648
VL - 35
JO - Advanced Materials
JF - Advanced Materials
IS - 11
M1 - 2208994
ER -