Heavy Doping by Bromine to Improve the Thermoelectric Properties of n‐type Polycrystalline SnSe

Li, Shan; Wang, Yumei; Chen, Chen; Li, Xiaofang; Xue, Wei; Wang, Xinyu; Zhang, Zongwei; Cao, Feng; Sui, Jiehe; Liu, Xingjun; Zhang, Qian

doi:10.1002/advs.201800598

Cited by 60 publications

(31 citation statements)

References 29 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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“…Research is obtained in the textured SnSe 0.94 Br 0.06 . Although this thermal conductivity is still larger than the reported value of 0.25 Wm -1 K -1 in n-type crystalline SnSe and polycrystalline SnSe bulks [20,42], the increased electrical transport properties lead to a high ZT value of 1.3 at 783 K for the textured SnSe 0.94 Br 0.06 , as shown in Figure 4(b), whose better performance lines in the direction that is parallel to the SPS pressure. In summary, the texturing process increases the ZT value in the cross-layer direction, suggesting the effectiveness of texture modulation on improving the thermoelectric property of n-type SnSe polycrystalline bulks.…”

Section: Researchmentioning

confidence: 62%

Highly Textured N-Type SnSe Polycrystals with Enhanced Thermoelectric Performance

et al. 2019

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Thermoelectric materials, which directly convert heat into electricity based on the Seebeck effects, have long been investigated for use in semiconductor refrigeration or waste heat recovery. Among them, SnSe has attracted significant attention due to its promising performance in both p-type and n-type crystals; in particular, a higher out-of-plane ZT value could be achieved in n-type SnSe due to its 3D charge and 2D phonon transports. In this work, the thermoelectric transport properties of n-type polycrystalline SnSe were investigated with an emphasis on the out-of-plane transport through producing textural microstructure. The textures were fabricated using mechanical alloying and repeated spark plasma sintering (SPS), as a kind of hot pressing, aimed at producing strong anisotropic transports in n-type polycrystalline SnSe as that in crystalline SnSe. Results show that the lowest thermal conductivity of 0.36 Wm-1 K-1 was obtained at 783 K in perpendicular to texture direction. Interestingly, the electrical transport properties are less anisotropic and even nearly isotropic, and the power factors reach 681.3 μWm-1 K-2 at 783 K along both parallel and perpendicular directions. The combination of large isotropic power factor and low anisotropic thermal conductivity leads to a maximum ZT of 1.5 at 783 K. The high performance elucidates the outstanding electrical and thermal transport behaviors in n-type polycrystalline SnSe, and a higher thermoelectric performance can be expected with future optimizing texture in n-type polycrystalline SnSe.

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“…3(d) and (e). The lattice fringes can be seen clearly from the High-resolution TEM image, the crystal plane spacing between two apparent planes is estimated to be 0.29 nm, which corresponds to the (111) planes of SnSe [26].…”

Section: Resultsmentioning

confidence: 96%

Enhanced thermoelectric performance of polycrystalline SnSe by compositing with layered Ti3C2Tx

Qin

Zhao

et al. 2021

Preprint

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Thermoelectric materials convert thermal energy into electricity directly. Constructing nanostructured composite architectures can be an effective strategy to develop thermoelectric performance. SnSe/Ti3C2Tx composite materials were synthesized through the electrostatic self-assembly method followed by spark plasma sintering. The interfaces introduced by Ti3C2Tx can scatter carriers effectively, thus increasing the Seebeck coefficients (S), finally, a high absolute S value of ~ 296.2 µV K− 1 was obtained at 773 K. At the same time, the high-density interfaces of SnSe/Ti3C2Tx composites enhance the phonon scattering, a low lattice thermal conductivity klat of 0.54 W m− 1 K− 1 was obtained in sample ω = 0.1%. Benefit from the elevated Seebeck coefficient and decreased thermal conductivity, a ZT of 0.1 was obtained in sample ω = 0.1% at 773 K along the pressing direction, compared with the pure SnSe, the thermoelectric performance improved by 68%. This research will provide a new way for the development of the thermoelectric properties of polycrystalline SnSe.

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Heavy Doping by Bromine to Improve the Thermoelectric Properties of n‐type Polycrystalline SnSe

Cited by 60 publications

References 29 publications

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

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

Highly Textured N-Type SnSe Polycrystals with Enhanced Thermoelectric Performance

Enhanced thermoelectric performance of polycrystalline SnSe by compositing with layered Ti3C2Tx

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