Single parabolic band behavior of thermoelectric p-type CuGaTe<sub>2</sub>

Shen, Jiaxu; Chen, Zhiwei; Lin, Siqi; Zheng, Lei; Li, Wen; Pei, Yanzhong

doi:10.1039/c5tc03325j

Cited by 97 publications

(77 citation statements)

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“…Besides, the shift of T * toward a higher T also indicates the p increase due to the bi‐polar effect 3,25. Figure 8c shows the determined S 2 σ , from which Sn 0.981 Se fabricated through solvothermal route has the highest S 2 σ of ≈6.7 µW cm −1 K −2 at 823 K due to the fact that its p value is much closer to the optimized p of 3.0 × 10 19 cm −3 calculated by the SPB model 306–308…”

Section: Vacancy Engineeringmentioning

confidence: 77%

“…As shown in Figure 8f, Sn 0.998 Se fabricated through traditional melting route have much higher κ than SnSe fabricated through solution‐based method for the entire temperature range, even though Sn 0.998 Se possesses much lower κ e , as shown in Figure 8g, obtained by κ e = L·σ·T via the Wiedemann‐Franz law 3. Here L of ≈1.5 × 10 −8 V 2 K −2 was calculated from the SPB model 306–308. Figure 8h shows the determined T ‐dependent κ l using κ l = κ – κ e .…”

Section: Vacancy Engineeringmentioning

confidence: 99%

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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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Section: Vacancy Engineeringmentioning

confidence: 77%

Section: Vacancy Engineeringmentioning

confidence: 99%

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

2020

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“…Doping was widely employed to improve the carrier concentration and the electrical conductivity, such as CuIn(Ga) 1−x M x Te 2 (M=Zn, Mn, Cd, Hg, Ni, Ag, Gd) [114][115][116][117][118], Cu 1−x Fe 1+x S 2 [119], Cu 3 Sb 1−x M x Se 4 (M=Al, In, Sn, Ge, Bi) [35,[120][121][122] and Cu 2 Cd 1−x In x SnSe 4 [123]. Introducing vacancies is another practical way for the electrical transport optimization as well as the lattice thermal conductivity minimizing.…”

Section: Tetragonal Diamond-like Compoundsmentioning

confidence: 99%

Copper chalcogenide thermoelectric materials

et al. 2018

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Cu-based chalcogenides have received increasing attention as promising thermoelectric materials due to their high efficiency, tunable transport properties, high elemental abundance and low toxicity. In this review, we summarize the recent research progress on this large family compounds covering diamond-like chalcogenides and liquid-like Cu 2 X (X=S, Se, Te) binary compounds as well as their multinary derivatives. These materials have the general features of two sublattices to decouple electron and phonon transport properties. On the one hand, the complex crystal structure and the disordered or even liquid-like sublattice bring about an intrinsically low lattice thermal conductivity. On the other hand, the rigid sublattice constitutes the charge-transport network, maintaining a decent electrical performance. For specific material systems, we demonstrate their unique structural features and outline the structure-performance correlation. Various design strategies including doping, alloying, band engineering and nanostructure architecture, covering nearly all the material scale, are also presented. Finally, the potential of the application of Cu-based chalcogenides as high-performance thermoelectric materials is briefly discussed from material design to device development.

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“…Such anisotropy change in µ e should be attributed to the tuned E def anisotropy, as shown in Figure b. E def represents the intensity of carrier scattering due to acoustic phonons (lattice vibration), which indicates that E def should be highly related with the anisotropy of crystal structure . With different atomic arrangements along different directions, anisotropic structured materials should experience different lattice vibrations along the different directions, leading to anisotropic E def and µ e .…”

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

confidence: 98%

“…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 . Dominated by high µ e of the Bi 2 Te 2.7 Se 0.3 films under 20 V external electric field, the corresponding σ is also the highest among all the as‐deposited films (Figure c).…”

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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Single parabolic band behavior of thermoelectric p-type CuGaTe₂

Abstract: Single parabolic band conduction not only explains but also evaluates the thermoelectric properties of p-type CuGaTe2.

Cited by 97 publications

References 50 publications

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

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

Copper chalcogenide thermoelectric materials

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

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Single parabolic band behavior of thermoelectric p-type CuGaTe2

Abstract: Single parabolic band conduction not only explains but also evaluates the thermoelectric properties of p-type CuGaTe2.

Cited by 97 publications

References 50 publications

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

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

Copper chalcogenide thermoelectric materials

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

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Product

Resources

About

Single parabolic band behavior of thermoelectric p-type CuGaTe₂

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