Achieving high average power factor in tetrahedrite Cu12Sb4S13 via regulating electron-phonon coupling strength

Yan, Yanci; Li, Nanhai; Wang, Guiwen; Xiong, Qihong; Fan, Lizhu; Jiang, Pengfei; Lu, Xu; Wang, Guoyu; Zhou, Xiaoyuan

doi:10.1016/j.mtphys.2021.100590

Cited by 10 publications

(7 citation statements)

References 66 publications

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“…This phenomenon could also be connected with the liquid-like nature of copper ions, which is more probable in Cu-rich tetrahedrite phases. As is often reported for the superionic argyrodites [24,60], as well as tetrahedrites [48,61,62], the migration of Cu ions can strongly disturb phonon propagation. To verify the TE performance of the investigated samples, the density of the state effective mass m * was calculated using the Kane band model.…”

Section: Samplementioning

confidence: 83%

Phase Analysis and Thermoelectric Properties of Cu-Rich Tetrahedrite Prepared by Solvothermal Synthesis

et al. 2022

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Because of the large Seebeck coefficient, low thermal conductivity, and earth-abundant nature of components, tetrahedrites are promising thermoelectric materials. DFT calculations reveal that the additional copper atoms in Cu-rich Cu14Sb4S13 tetrahedrite can effectively engineer the chemical potential towards high thermoelectric performance. Here, the Cu-rich tetrahedrite phase was prepared using a novel approach, which is based on the solvothermal method and piperazine serving both as solvent and reagent. As only pure elements were used for the synthesis, the offered method allows us to avoid the typically observed inorganic salt contaminations in products. Prepared in such a way, Cu14Sb4S13 tetrahedrite materials possess a very high Seebeck coefficient (above 400 μVK−1) and low thermal conductivity (below 0.3 Wm−1K−1), yielding to an excellent dimensionless thermoelectric figure of merit ZT ≈ 0.65 at 723 K. The further enhancement of the thermoelectric performance is expected after attuning the carrier concentration to the optimal value for achieving the highest possible power factor in this system.

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Section: Samplementioning

confidence: 83%

Phase Analysis and Thermoelectric Properties of Cu-Rich Tetrahedrite Prepared by Solvothermal Synthesis

et al. 2022

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“…Considering the practical application of TE materials, both the average power factor (PF ave ) and the average zT (zT ave ) are critical. [17,55] Here, PF ave and zT ave of Cu 3 SbS 4 /9 wt% CuAlS 2 and Cu 3 SbS 4 /9 wt% CuAlS 2 /1.5 wt% AgAlS 2 are shown in Figure 8b and Figure S28 (Supporting Information), respectively. It can be seen that PF ave and zT ave of Cu 3 SbS 4 /9 wt% CuAlS 2 reach 16.1 µW cm −1 K −2 and 0.73 in the temperature range of 400 to 773 K, respectively.…”

Section: Thermoelectric Performance Of Cu 3 Sbs 4 /9 Wt% Cuals 2 /Y W...mentioning

confidence: 99%

“…obtained a high average power factor of 12 µW cm −1 K −2 and a high zT of 1.1 at 723 K by manipulating electron–phonon coupling strength in Cu 12 Sb 4 S 13 . [ 17 ] Hu et al. fabricated Cu 12 Sb 4 S 13 with porous microstructure by adding BiI 3 and claimed a high zT of 1.15 at 723 K. [ 18 ] Kumar et al.…”

Section: Introductionmentioning

confidence: 99%

High Thermoelectric Performance in Earth‐Abundant Cu₃SbS₄ by Promoting Doping Efficiency via Rational Vacancy Design

Wang

et al. 2023

Adv Funct Materials

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Sulfides are well investigated as thermoelectric materials but their performance is typically limited by low electrical conductivity. High electrical performance in Cu3SbS4 is reported by creating high valence vacancies, which efficiently provides multiple carriers. It is revealed from the perspective of a chemical bond by calculations that Al can serve as vacancy stabilizer as its entry into the lattice forms intensified bonds with neighboring atoms and lowers the vacancy formation energy. As a result, the average power factor of Cu3SbS4 with 9 wt% CuAlS2 reaches 16.1 µW cm−1 K−2. Finally, by further addition of AgAlS2, a peak zT of 1.3 and an average zT of 0.77 are obtained due to the reduced thermal conductivity. The attained average power factor and average zT are superior to other low‐toxic thermoelectric sulfides. The findings shed light on the new strategy for creating favorable vacancies to realize high‐efficiency doping in thermoelectric materials.

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“…3 For the relevant parameters, κ was easily adjusted in comparison with the other parameters, and it can be optimized by microstructure and stepwise alloying design. 4 Illuminated by the idea of "crystallographic distortion" of diamondoid solid solutions, the stepwise alloying strategy is expected to create a different approach to depress thermal conductivity in solid solutions. 5,6 Theoretically, stepwise alloying strategies could adjust lattice thermal conductivity; for example, carrier pocket engineering, 7 interfacial effects, 8 and entropy engineering can synergistically tune the intrinsic phonon scattering.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Thermoelectric (TE) materials have no moving parts and can convert waste heat into electrical energy, which makes them particularly appealing in power generation and waste heat recycling. , The conversion efficiency of thermoelectric materials is gauged by the dimensionless figure of merit zT , which is defined as italiczT = α 2 σ κ T , (where α, σ, α 2 σ, κ, and T are the Seebeck coefficient, electrical conductivity, power factor, thermal conductivity, and absolute temperature, respectively) . For the relevant parameters, κ was easily adjusted in comparison with the other parameters, and it can be optimized by microstructure and stepwise alloying design . Illuminated by the idea of “crystallographic distortion” of diamondoid solid solutions, the stepwise alloying strategy is expected to create a different approach to depress thermal conductivity in solid solutions. , Theoretically, stepwise alloying strategies could adjust lattice thermal conductivity; for example, carrier pocket engineering, interfacial effects, and entropy engineering can synergistically tune the intrinsic phonon scattering.…”

Section: Introductionmentioning

confidence: 99%

Stepwise Alloying in Liquid-like Solid Solutions to Achieve Crystallographic Distortion for Regulating Thermoelectric Transport Behavior

Bo,

Wang,

Zhu

et al. 2023

ACS Appl. Mater. Interfaces

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With the surge of energy consumption, environmental-protection Cu2–x Se thermoelectric materials are increasingly attracting attention. In this work, multilayered structures are constructed in Cu2–x Se solid solutions by alloying (SnSe)0.75(AgBiSe2)0.25, which strongly scatters full-wavelength phonons by carefully regulating the crystallographic distortion. By using the stepwise alloying strategies, crystallographic distortion and the resultant strain fields presented in microstructure were strengthened markedly, which enhanced the phonon scattering. Meanwhile, by adjusting the coalloying content of Ag, Bi, and Sn elements, the carrier and phonon transports were well decoupled in p-type Cu2–x Se, and the thermoelectric performance was significantly enhanced. By optimized power factor as well as depressed heat transport originating from the moderate coalloying, the maximum zT of 1.23 at 750 K was achieved in Cu1.9Se - 1 wt % (SnSe)0.75(AgBiSe2)0.25. This study indicated that the stepwise alloying strategy was a suitable method for optimizing zT of Cu2–x Se.

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Achieving high average power factor in tetrahedrite Cu12Sb4S13 via regulating electron-phonon coupling strength

Cited by 10 publications

References 66 publications

Phase Analysis and Thermoelectric Properties of Cu-Rich Tetrahedrite Prepared by Solvothermal Synthesis

Phase Analysis and Thermoelectric Properties of Cu-Rich Tetrahedrite Prepared by Solvothermal Synthesis

High Thermoelectric Performance in Earth‐Abundant Cu₃SbS₄ by Promoting Doping Efficiency via Rational Vacancy Design

Stepwise Alloying in Liquid-like Solid Solutions to Achieve Crystallographic Distortion for Regulating Thermoelectric Transport Behavior

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Achieving high average power factor in tetrahedrite Cu12Sb4S13 via regulating electron-phonon coupling strength

Cited by 10 publications

References 66 publications

Phase Analysis and Thermoelectric Properties of Cu-Rich Tetrahedrite Prepared by Solvothermal Synthesis

Phase Analysis and Thermoelectric Properties of Cu-Rich Tetrahedrite Prepared by Solvothermal Synthesis

High Thermoelectric Performance in Earth‐Abundant Cu3SbS4 by Promoting Doping Efficiency via Rational Vacancy Design

Stepwise Alloying in Liquid-like Solid Solutions to Achieve Crystallographic Distortion for Regulating Thermoelectric Transport Behavior

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High Thermoelectric Performance in Earth‐Abundant Cu₃SbS₄ by Promoting Doping Efficiency via Rational Vacancy Design