Enhancement of the thermoelectric performance of n−type Bi2O2Se by Ce4+ doping

Hong, H.Y.; Kim, D.H.; Won, Sung Ok; Park, K.

doi:10.1016/j.jmrt.2021.10.002

Cited by 28 publications

(15 citation statements)

References 55 publications

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“…Therefore, the experimental method successfully realizes that the Pb and Fe atoms enter into the BiCuSeO lattice to replace the Bi and Cu atoms. To determine whether or not an anisotropy exists in the Bi 0.90 Pb 0.10 Cu 1– x Fe x SeO samples, the Lotgering factor F is obtained using the XRD data and the equation F = ( P – P 0 )/(1 – P 0 ), where P and P 0 are the integral intensity ratios of all (00l) and ( hkl ) diffraction peaks in preferred and randomly oriented samples, respectively. − The calculated results are shown in Table S1, indicating that the degree of preferential orientation for the samples is weak or even nonexisting; therefore, the same measurement direction can be randomly selected when measuring the electrical and thermal transport properties.…”

Section: Resultsmentioning

confidence: 99%

Microwave Synthesis and Enhanced Thermoelectric Performance of p-Type Bi_0.90Pb_0.10Cu_1–xFe_xSeO Oxyselenides

Lei

Yang

Qiu

et al. 2022

ACS Appl. Mater. Interfaces

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BiCuSeO oxyselenide, one of the best oxygen-containing thermoelectric materials, is promising with great potential applications. In this work, we present a high ZT of >1.3 in Bi 0.90 Pb 0.10 Cu 0.96 Fe 0.04 SeO fabricated via microwave synthesis and subsequent spark plasma sintering (SPS). We added 3−4 atom % Fe to the Pb-doped BiCuSeO to regulate the hole carrier concentration and mobility to 0.8−1.0 × 10 20 cm −3 and ∼40 cm 2 V −1 S −1 , respectively, achieving moderate electrical conductivity, high Seebeck coefficient, and low carrier thermal conductivity simultaneously in a dual-doped sample. Under the synergistic enhancement by stress field, dislocation, and nanophase, the lattice thermal conductivity of Bi 0.90 Pb 0.10 Cu 0.96 Fe 0.04 SeO is limited to 0.24−0.49 W m −1 K −1 at 300−873 K. The development of efficient preparation methods for highperformance thermoelectric materials is significant to promote the application of thermoelectric conversion technology.

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Section: Resultsmentioning

confidence: 99%

Microwave Synthesis and Enhanced Thermoelectric Performance of p-Type Bi_0.90Pb_0.10Cu_1–xFe_xSeO Oxyselenides

Lei

Yang

Qiu

et al. 2022

ACS Appl. Mater. Interfaces

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“…On the other hand, as the Li + and Mg 2+ concentrations increase, the hole mobility decreases. For instance, the hole mobilities of the BLM-1033 samples with x = 0.05, 0.10 and 0.15 are 0.091, 0.087 and 0.077 cm 2 V −1 s −1 , respectively, because of the increased hole concentration [30]. Moreover, as the sintering temperature increases, the hole concentration and hole mobility increase.…”

Section: Resultsmentioning

confidence: 99%

Influence of sintering temperature and Li⁺/Mg²⁺ doping on the thermoelectric properties of Bi_2−2xLi_xMg_xSr₂Co₂O_y

Hong

Gwon

Kim

et al. 2022

Advances in Applied Ceramics

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Bi 2−2x Li x Mg x Sr 2 Co 2 O y (x = 0.05, 0.10 and 0.15) samples are prepared by a solid-state reaction at various temperatures (1033-1133 K). All X-ray diffraction peaks can be indexed as the monoclinic Bi 2 Sr 2 Co 2 O y phase. The structural and thermoelectric properties of Bi 2−2x Li x Mg x Sr 2 Co 2 O y samples are systematically investigated, depending on the sintering temperature and the Li + /Mg 2+ concentration. A higher sintering temperature increases the hole concentration and hole mobility, whereas a higher Li + /Mg 2+ concentration increases the hole concentration and decreases the hole mobility. As the Li + /Mg 2+ concentration increases, the power factor of the samples sintered at 1033 K decreases, whereas that of the samples sintered at 1083 and 1133 K increases. Of the prepared samples, Bi 1.70 Li 0.15 Mg 0.15 Sr 2 Co 2 O y sintered at 1133 K shows the largest power factor (0.25 × 10 −4 W m −1 K −2 ) at 973 K. This power factor is 2.5 times greater than that of Bi 1.70 Li 0.15 Mg 0.15 Sr 2 Co 2 O y sintered at 1033 K (0.10 × 10 −4 W m −1 K −2 ) at 973 K.

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“…Finally, to establish the accuracy of our predicted transport properties we performed a detailed comparison to selected measurements from experimental studies on Bi 2 SeO 2 [30][31][32][33][34] and Bi 2 TeO 2 [29] (section S2.1 of the SI). The calculations predict the measured transport properties of single-crystal Bi 2 SeO 2 [30] to within a factor of two.…”

Section: Systemmentioning

confidence: 99%

“…As for the electrical properties, we compared our calculations to measurements of the κ latt in experimental studies on Bi 2 SeO 2 [31][32][33][34] and Bi 2 TeO 2 [29] (section S2.2 of the SI).…”

Section: Systemmentioning

confidence: 99%

“…Bi 2 TeO 2 has been less widely studied, but a bulk ZT = 0.13 at ∼600 K was obtained without doping to optimise the carrier concentration [29]. Bi 2 SeO 2 and Bi 2 TeO 2 have also both demonstrated low lattice thermal conductivities of 0.9-1.6 W m −1 K −1 and 0.91 W m −1 K −1 , respectively, at 300 K [29,[31][32][33][34]. Bi 2 SO 2 has not been studied in experiments, but calculations predict that its larger κ of 2.9 W m −1 K −1 at 300 K can be reduced to 1.85 W m −1 K −1 in a 2D monoloayer, and that such a nanosheet could show ZT > 3 at high temperature [35].…”

Section: Introductionmentioning

confidence: 99%

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Thermoelectric properties of the bismuth oxychalcogenides Bi₂SO₂, Bi₂SeO₂ and Bi₂TeO₂

Flitcroft,

Althubiani,

Skelton

2024

J. Phys. Energy

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We present a detailed theoretical study of the thermoelectric properties of the bismuth oxychalcogenides Bi2ChO2 (Ch = S, Se, Te).The electrical transport is modelled using semi-classical Boltzmann transport theory with electronic structures from hybrid density-functional theory, including an approximate model for the electron lifetimes. The lattice thermal conductivity is calculated using first-principles phonon calculations with an explicit treatment of anharmonicity, yielding microscopic insight into how partial replacement of the chalcogen in the bismuth chalcogenides impacts the phonon transport. We find very good agreement between the predicted transport properties and a favourable cancellation of errors that allows for near-quantitative predictions of the thermoelectric figure of merit ZT. Our calculations suggest recent experiments on n-doped Bi2SeO2 have achieved close to the largest ZT possible in bulk materials, whereas the largest reported ZT for Bi2TeO2 could be improved sixfold by optimising the carrier concentration. We also predict that much larger ZT > 2.5, competitive with the benchmark thermoelectric SnSe, could be obtained for Bi2SO2 and Bi2SeO2 with heavy p-type doping. This study demonstrates the predictive power of this modelling approach for studying thermoelectrics and highlights several avenues for improving the performance of the Bi2ChO2.

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Enhancement of the thermoelectric performance of n−type Bi2O2Se by Ce4+ doping

Cited by 28 publications

References 55 publications

Microwave Synthesis and Enhanced Thermoelectric Performance of p-Type Bi_0.90Pb_0.10Cu_1–xFe_xSeO Oxyselenides

Microwave Synthesis and Enhanced Thermoelectric Performance of p-Type Bi_0.90Pb_0.10Cu_1–xFe_xSeO Oxyselenides

Influence of sintering temperature and Li⁺/Mg²⁺ doping on the thermoelectric properties of Bi_2−2xLi_xMg_xSr₂Co₂O_y

Thermoelectric properties of the bismuth oxychalcogenides Bi₂SO₂, Bi₂SeO₂ and Bi₂TeO₂

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Enhancement of the thermoelectric performance of n−type Bi2O2Se by Ce4+ doping

Cited by 28 publications

References 55 publications

Microwave Synthesis and Enhanced Thermoelectric Performance of p-Type Bi0.90Pb0.10Cu1–xFexSeO Oxyselenides

Microwave Synthesis and Enhanced Thermoelectric Performance of p-Type Bi0.90Pb0.10Cu1–xFexSeO Oxyselenides

Influence of sintering temperature and Li+/Mg2+ doping on the thermoelectric properties of Bi2−2xLixMgxSr2Co2Oy

Thermoelectric properties of the bismuth oxychalcogenides Bi2SO2, Bi2SeO2 and Bi2TeO2

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Microwave Synthesis and Enhanced Thermoelectric Performance of p-Type Bi_0.90Pb_0.10Cu_1–xFe_xSeO Oxyselenides

Microwave Synthesis and Enhanced Thermoelectric Performance of p-Type Bi_0.90Pb_0.10Cu_1–xFe_xSeO Oxyselenides

Influence of sintering temperature and Li⁺/Mg²⁺ doping on the thermoelectric properties of Bi_2−2xLi_xMg_xSr₂Co₂O_y

Thermoelectric properties of the bismuth oxychalcogenides Bi₂SO₂, Bi₂SeO₂ and Bi₂TeO₂