Enhanced Thermoelectric Performance of N-Type (Pbse)N(Sb2te3) Pseudo-Binary Via Zn Filling and Ag2se Compositing
Lead selenide (PbSe) is considered to be decent candidate replacing lead telluride (PbTe) as intermediate temperature (600-900 K) thermoelectric application due to its lower intrinsic lattice thermal conductivity, higher thermal stability, and larger abundance of Se than Te. To improve the thermoelectric performance of n-type PbSe, we constructed an n-type PbSe-Sb 2 Se 3 pseudo-binary via alloying Sb 2 Se 3 into PbSe matrix to obtain a reduced lattice thermal conductivity at a broad temperature range. Next, we introduced extra Zn into matrix to optimize the electron concentration. Last, we further added excess Ag 2 Se to modulate the lattice thermal conductivity at temperature < 523 K. Eventually, we obtained an ultralow lattice thermal conductivity of ~ 0.40 W m −1 K −1 and a large peak ZT of ~ 1.36 at 723 K in the composition of (PbSe) 40 (Sb 2 Se 3 )Zn 0.1 (Ag 2 Se) 0.75 ; meanwhile, the average ZT between 323-773 K is as high as ~ 0.78, revealing a significant improvement over pristine PbSe
Year of publication: |
[2022]
|
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Authors: | Wu, Di ; Lian, Xueqing ; Wang, Jicheng ; Ma, Baopeng ; Chao, Xiaolian ; Yang, Zupei ; Zhang, Fudong |
Publisher: |
[S.l.] : SSRN |
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