Enhancing thermoelectric performance of (Cu1-xAgx)2Se via CuAgSe secondary phase and porous design

Liu, Wei‐Di; Shi, Xiao‐Lei; Moshwan, Raza; Hong, Min; Yang, Lei; Chen, Huajun; Zou, Jin

doi:10.1016/j.susmat.2018.e00076

Cited by 26 publications

(30 citation statements)

References 40 publications

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“…Such simultaneous reductions in l , C v , and v have effectively reduced κ l of Cu 2 Se to ≈0.3 W m −1 K −1 (Figure b) as well as subsequently enhanced zT (Figure c). Similar results have also been evidenced in other studies …”

Section: Strategies For the Thermoelectric Property Enhancementsupporting

confidence: 93%

“…Unlike the solid‐solution case reported by Guan et al, Day et al found that κ l of Ag‐doped Cu 2 Se remains nearly unchanged and the additional CuAgSe secondary phase remained stable until 500 K. Liu et al reported an increase in κ l when Ag below the solubility limit of ≈1% is homogeneously doped in Cu 2 Se synthesized by solvothermal method. When Ag doping level is above the solubility limit, additional CuAgSe secondary phase can form and reduce κ l . When Ag is homogeneously doped into the Cu 2 Se matrix, regardless of the phase transition, κ l is enhanced due to the tuned superionicity as well as anharmonicity .…”

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

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Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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Due to the nature of their liquid‐like behavior and high dimensionless figure of merit, Cu2X (X = Te, Se, and S)‐based thermoelectric materials have attracted extensive attention. The superionicity and Cu disorder at the high temperature can dramatically affect the electronic structure of Cu2X and in turn result in temperature‐dependent carrier‐transport properties. Here, the effective strategies in enhancing the thermoelectric performance of Cu2X‐based thermoelectric materials are summarized, in which the proper optimization of carrier concentration and minimization of the lattice thermal conductivity are the main focus. Then, the stabilities, mechanical properties, and module assembly of Cu2X‐based thermoelectric materials are investigated. Finally, the future directions for further improving the energy conversion efficiency of Cu2X‐based thermoelectric materials are highlighted.

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Section: Strategies For the Thermoelectric Property Enhancementsupporting

confidence: 93%

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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“…Besides, benefitted from the advantages of convenient morphology control, hydrothermal/solvothermal synthesis are specifically suitable for fabricating SnSe nanocrystals with various sizes and types, which are good candidates for fabricating 2D and flexible thermoelectric generators. In summary, when hydrothermal/solvothermal meet thermoelectric SnSe, there will be infinite potentials for promoting the development of SnSe‐based thermoelectrics, and hydrothermal/solvothermal methods applied to thermoelectric SnSe can also provide new perspectives as reference for other thermoelectric systems, such as PbTe,402 Cu 2 Se/Cu 2 S,245,403–407 Bi 2 Te 3 ,242,243,247,408–412 and SnTe,413–418 which are also friendly to hydrothermal/solvothermal‐based aqueous solution methods.…”

Section: Conclusion Challenge and Outlookmentioning

confidence: 99%

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

2020

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Tin selenide (SnSe) is one of the most promising candidates to realize environmentally friendly, cost‐effective, and high‐performance thermoelectrics, derived from its outstanding electrical transport properties by appropriate bandgaps and intrinsic low lattice thermal conductivity from its anharmonic layered structure. Advanced aqueous synthesis possesses various unique advantages including convenient morphology control, exceptional high doping solubility, and distinctive vacancy engineering. Considering that there is an urgent demand for a comprehensive survey on the aqueous synthesis technique applied to thermoelectric SnSe, herein, a thorough overview of aqueous synthesis, characterization, and thermoelectric performance in SnSe is provided. New insights into the aqueous synthesis‐based strategies for improving the performance are provided, including vacancy synergy, crystallization design, solubility breakthrough, and local lattice imperfection engineering, and an attempt to build the inherent links between the aqueous synthesis‐induced structural characteristics and the excellent thermoelectric performance is presented. Furthermore, the significant advantages and potentials of an aqueous synthesis route for fabricating SnSe‐based 2D thermoelectric generators, including nanorods, nanobelts, and nanosheets, are also discussed. Finally, the controversy, strategy, and outlook toward future enhancement of SnSe‐based thermoelectric materials are also provided. This Review guides the design of thermoelectric SnSe with high performance and provides new perspectives as a reference for other thermoelectric systems.

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“…Particularly, n‐type Bi 2 Te 2.7 Se 0.3 films under 20 V external electric field has the highest µ e of ≈140 cm 2 V −1 s −1 , which is nearly double than those of others. To better understand these unique thermoelectric performance, the deformation potential ( E def ), effective mass ( m* ) were extracted from the measured electrical performance based on single parabolic band model . The abnormally high µ e of the Bi 2 Te 2.7 Se 0.3 films under 20 V external electric field is derived from an ultralow E def (Figure b), indicating the weakened phonon–electron scattering .…”

Section: Comparison Of Zt (T = 300 K) Of Bi2te27se03 Films Preparedmentioning

confidence: 99%

Anisotropy Control–Induced Unique Anisotropic Thermoelectric Performance in the n‐Type Bi₂Te_2.7Se_0.3 Thin Films

et al. 2019

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Anisotropic Bi2Te3‐based thermoelectric materials have drawn extensive interest in the past decades. Here, n‐type Bi2Te2.7Se0.3 films with superhigh figure of merit are developed through anisotropy control via tuning an external electric field and deposition anisotropy. It is found that the angle of interplanar grain boundaries between (0 1 5) and (0 1 11) planes can be tuned by the applied external electric field, which leads to the strengthened anisotropy of electron mobility and simultaneously maintains low lattice thermal conductivity. Dominated by the unique change in the anisotropy of both lattice thermal conductivity and electron mobility, a record‐high zT value of ≈1.6 at room temperature can be achieved in the as‐deposited n‐type Bi2Te2.7Se0.3 film under 20 V external electric field. This work indicates that the electric field–induced deposition anisotropy control can be used to develop high‐performance Bi2Te3‐based thermoelectric films.

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Enhancing thermoelectric performance of (Cu1-xAgx)2Se via CuAgSe secondary phase and porous design

Cited by 26 publications

References 40 publications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

Anisotropy Control–Induced Unique Anisotropic Thermoelectric Performance in the n‐Type Bi₂Te_2.7Se_0.3 Thin Films

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Enhancing thermoelectric performance of (Cu1-xAgx)2Se via CuAgSe secondary phase and porous design

Cited by 26 publications

References 40 publications

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

Anisotropy Control–Induced Unique Anisotropic Thermoelectric Performance in the n‐Type Bi2Te2.7Se0.3 Thin Films

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Product

Resources

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Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Anisotropy Control–Induced Unique Anisotropic Thermoelectric Performance in the n‐Type Bi₂Te_2.7Se_0.3 Thin Films