Study on the mechanism of Y doping effect for improving the properties of ZnO thermoelectric ceramics

Feng, Bo; Li, Guangqiang; Kong, Dong; Xu, Chenhui; Kuang, Zhixiang; Ma, Yan; Chen, Zhuo; Li, Yawei; Gu, Huazhi; Fan, Xiaoliang

doi:10.1016/j.scriptamat.2022.114740

Cited by 11 publications

(11 citation statements)

References 40 publications

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“…d) Comparison of power factor extracted from previously reported ZnO‐based TE materials. [ 50–55 ] The temperature dependence of e) thermal conductivity, f) electron thermal conductivity, g) lattice thermal conductivity, and h) ZT for the fabricated ZnO ceramics.…”

Section: Resultsmentioning

confidence: 99%

“…d) Comparison of ZT value extracted from previously reported ZnO‐based TE materials. [ 50–55 ] e) Schematic diagram of the electron and phonon transport mechanisms of 2% nano‐Si 3 N 4 particles compositing the 3% SnO 2 ‐doped ZnO ceramics. f) The Vickers hardness of the typical fabricated ZnO ceramics under a load of 4.9 N and the corresponding microscopy images of indentation.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, the S(T) of all the sample shows negative, suggesting an n-type conductive behavior. Interestingly, after compositing Si 3 N 4 nanoparticles in 3% SnO 2 -doped ZnO, |S| is remarkably enhanced by 57.7% from 67.1 μV•K −1 (sample 3-SnO 2 ) to 105.8 μV•K −1 (sample 2-Si 3 N 4 ) at 300 K coming from the introduced carrier filtering effect that will be discussed in detail later, while 𝜎 is decreased slightly, which may be ascribed to the [50][51][52][53][54][55] The temperature dependence of e) thermal conductivity, f) electron thermal conductivity, g) lattice thermal conductivity, and h) ZT for the fabricated ZnO ceramics.…”

Section: Improved Te Performancementioning

confidence: 95%

“…Moreover, SHPs can also result in grain refinement, and introduce multiple microstructures, which is similar to SPS. [ 16 ] Then, the as‐obtained bulk (around a thickness of 4.5 mm and 9.5 mm in diameter) was ground to powders and then conducted to a densifying procedure of a rapid densifying process of SPS at 1273 K for 10 min under a pressure of 50 MPa in the vacuum atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the sharply shaped conduction band edge leads to the density of states effective mass of ZnO is so smaller (0.24 m e ) that S and 𝜎 are coupled together more strongly on the carrier concentration. [11,16] Sometimes, even though doping in ZnO can induce the chemical compression stress in lattice to increase the density of states (DOS) to some extent, the increase in S seems negligible because the increased carrier concentration will severely deteriorate S. [17] Therefore, there needs to seek for other ways to enhance S without compromising 𝜎 in ZnO.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Wang,

Gao,

You

et al. 2023

Adv Funct Materials

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ZnO is a promising high‐temperature thermoelectric (TE) material due to its superior stability and earth abundance. However, the coupling relation between Seebeck coefficient and electrical conductivity on carrier concentration limits the optimum TE performance for most TE materials, especially ZnO. Herein, enhancement of TE performance is achieved via a stepwise optimization strategy composed of carrier concentration optimization and carrier filtering effect for fabricating robust ZnO‐based composite ceramics through a self‐developed specific high‐pressure synthesis followed by spark plasma sintering. Specifically, doping SnO2 provide substantial electrons to surge the carrier concentration. The subsequent compositing Si3N4 nanoparticles results in the unique reaction‐generated Zn2SiO4 nanoprecipitates with a larger bandgap and intrinsically low thermal conductivity, which introduce an excellent carrier filtering effect to increase the Seebeck coefficient by 57.7% at 300 K without compromising electrical conductivity much and enhance phonon scattering to cause an ultralow lattice thermal conductivity of 1.39 W m−1 K−1 achieving amorphous limits of ZnO (1.4±0.1 W m−1 K−1). Consequently, a high peak ZT (figure of merit) of 0.691 at 873 K is obtained, which is higher than that of previously reported ZnO‐based TE materials. This work demonstrates a feasible and effective strategy to fabricate high‐performance TE materials, especially those with inferior electrical conductivity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Improved Te Performancementioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Wang,

Gao,

You

et al. 2023

Adv Funct Materials

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Record‐High Thermoelectric Performance in Al‐Doped ZnO via Anderson Localization of Band Edge States

Serhiienko,

Novitskii,

Garmroudi

et al. 2024

Advanced Science

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Oxides are of interest for thermoelectrics due to their high thermal stability, chemical inertness, low cost, and eco‐friendly constituting elements. Here, adopting a unique synthesis route via chemical co‐precipitation at strongly alkaline conditions, one of the highest thermoelectric performances for ZnO ceramics ( 21.5 µW cm−1 K−2 and 0.5 at 1100 K in ) is achieved. These results are linked to a distinct modification of the electronic structure: charge carriers become trapped at the edge of the conduction band due to Anderson localization, evidenced by an anomalously low carrier mobility, and characteristic temperature and doping dependencies of charge transport. The bi‐dimensional optimization of doping and carrier localization enable a simultaneous improvement of the Seebeck coefficient and electrical conductivity, opening a novel pathway to advance ZnO thermoelectrics.

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Enhancing the thermoelectric power factor of nanostructured SnO2 via Bi substitution

Ashfaq

Smirani

Abboud

et al. 2023

Ceramics International

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Study on the mechanism of Y doping effect for improving the properties of ZnO thermoelectric ceramics

Cited by 11 publications

References 40 publications

Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Enhancement of Thermoelectric Performance in Robust ZnO‐Based Composite Ceramics Driven by A Stepwise Optimization Strategy

Record‐High Thermoelectric Performance in Al‐Doped ZnO via Anderson Localization of Band Edge States

Enhancing the thermoelectric power factor of nanostructured SnO2 via Bi substitution

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