Anisotropy thermoelectric and mechanical property of polycrystalline SnSe prepared under different processes

Chi, Ma; Liu, Hongquan; Chen, Ruxue; Su, Qiang; Cui, Hongzhi; Gu, Yi-Jie

doi:10.1007/s10854-019-00943-8

Cited by 11 publications

(10 citation statements)

References 35 publications

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“…Among the state‐of‐the‐art thermoelectric materials, tin selenide (SnSe) is one of the most promising candidates to apply to thermoelectric devices due to its environmentally friendly feature, high cost‐effectiveness, and outstanding thermoelectric performance derived from its appropriate bandgap of ≈0.9 eV and intrinsic low κ l 9,10 . Figure a shows the development timeline for all SnSe‐based bulk thermoelectric materials,11–124 from which a record high ZT of ≈2.8 at 773 K was found in the n‐type SnSe single crystal,11 derived from its ultralow κ l of ≈0.18 W m −1 K −1 and high S 2 σ of ≈9.0 µW cm −1 K −2 at this temperature 125. Such a high ZT is also very competitive to other state‐of‐the‐art thermoelectric systems which possess ZTs > 2, such as PbTe,126–134 GeTe,135–147 Cu 2 Se/Cu 2 S,148–157 and AgSbTe 2 158.…”

Section: Introductionmentioning

confidence: 97%

“…A summary of ZTs for SnSe‐based thermoelectric materials. a) The timeline for state‐of‐the‐art SnSe bulks thermoelectric materials,11–124,169–182 the performance achieved by solution route are circled by yellow. b) Temperature‐dependent ZT and c) corresponding peak and average ZT values for polycrystalline SnSe through different fabrication techniques 13,16,22,46,58,62,95,99,101.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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

2020

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“…Fig. 4 Comparison of fracture toughness values measured experimentally for both polycrystalline and single crystalline samples 6,[22][23][24][25]31,[47][48][49][50][51][52][53][54][55][56][57][58][59][60][61] to those calculated using fracture energies estimated from the integral stress-displacement method. All markers that lie above the black diagonal line have higher experimental fracture toughness values than calculated fracture toughness values.…”

Section: Discussionmentioning

confidence: 99%

“…Particularly for highly anisotropic materials, grain orientation can be expected to play a significant role. 51 Additionally, it is important to note that many of the materials studied in this work were thermoelectric materials with very limited experimental data regarding fracture toughness. It must also be recognized that experimentally determining fracture toughness often has significant errors, particularly when calculated using the very common Vickers indentation method.…”

Section: Discussionmentioning

confidence: 99%

Estimating the lower-limit of fracture toughness from ideal-strength calculations

et al. 2022

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“…However, single crystal SnSe has the lamellar structure which makes mechanical failure, like cracks, easy to occur and cannot be widely used in thermoelectric conversion devices. [ 14 ] In addition, single crystal SnSe needs more energy consumption and time in the synthetic process, which increases its cost. On those accounts, polycrystalline SnSe‐based materials are greatly desired.…”

Section: Introductionmentioning

confidence: 99%

Realizing High Thermoelectric Performance of Ag/Al Co‐Doped Polycrystalline SnSe through Band Structure Modification and Hydrogen Reduction

Xin

Shen

et al. 2022

Adv Elect Materials

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Single crystal tin selenide (SnSe) has a recorded high thermoelectric figure of merit (ZT) value of 2.6 at 923 K, but it is easy to form mechanical cracks and difficult to apply in thermoelectric conversion devices. Polycrystalline SnSe has better mechanical properties but inferior ZT values, which needs further optimization for applications. This work aims at enhancing the thermoelectric performance of polycrystalline SnSe through synergistic optimization of sliver (Ag) and aluminum (Al) co‐doping with the hydrogen reduction. The effects of Ag and Al doping on electronic transport properties are systematically investigated by density functional theory calculation and experimental measurement. Compared with pristine SnSe, Ag doping can effectively increase the hole concentration to 1.58 × 1019 cm−3 and improve the conductivity. Results also indicate that using Al dopant may slightly decrease the hole concentration but reduce the thermal excitation temperature, and introduce point defects reducing the lattice thermal conductivity through scattering phonons. In addition, the hydrogen reduction of sample powders before synthesis can effectively remove Sn oxides and reduce lattice thermal conductivity. At last, a state‐of‐the‐art maximum ZT value of 1.69 at 823 K is obtained in Ag0.01Al0.01Sn0.98Se. This study provides a theoretical basis and technical guidance for designing high‐performance polycrystalline SnSe.

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Anisotropy thermoelectric and mechanical property of polycrystalline SnSe prepared under different processes

Cited by 11 publications

References 35 publications

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

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

Estimating the lower-limit of fracture toughness from ideal-strength calculations

Realizing High Thermoelectric Performance of Ag/Al Co‐Doped Polycrystalline SnSe through Band Structure Modification and Hydrogen Reduction

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