Multipoint Defect Synergy Realizing the Excellent Thermoelectric Performance of n‐Type Polycrystalline SnSe via Re Doping

Ge, Zhen Hua; Qiu, Yang; Chen, Yue Xing; Chong, Xiaoyu; Feng, Jing; Liu, Zhe; He, Jiaqing

doi:10.1002/adfm.201902893

Cited by 78 publications

(49 citation statements)

References 34 publications

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“…Moreover, the size of the SnSe nanostructures composing the thin film, as shown in Fig. 1 a, is in the order of 10 nm to submicron; this scale is comparable with the previously studied nanocrystalline SnSe 25 , 46 or the polycrystalline grains in SnSe pellets and sintered samples for thermoelectric applications 22 , 27 , 28 , 47 – 49 . This means that the annealing effect investigated in the current study would also occur in thermoelectric devices based on SnSe.…”

Section: Resultssupporting

confidence: 83%

Oxidation-induced thermopower inversion in nanocrystalline SnSe thin film

Shimizu

Miwa²,

Kobayashi

et al. 2021

Sci Rep

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Given the growing demand for environmentally friendly energy sources, thermoelectric energy conversion has attracted increased interest as a promising CO2-free technology. SnSe single crystals have attracted attention as a next generation thermoelectric material due to outstanding thermoelectric properties arising from ultralow thermal conductivity. For practical applications, on the other hand, polycrystalline SnSe should be also focused because the production cost and the flexibility for applications are important factors, which requires the systematic investigation of the stability of thermoelectric performance under a pseudo operating environment. Here, we report that the physical properties of SnSe crystals with nano to submicron scale are drastically modified by atmospheric annealing. We measured the Seebeck effect while changing the annealing time and found that the large positive thermopower, + 757 μV K−1, was completely suppressed by annealing for only a few minutes and was eventually inverted to be the large negative value, − 427 μV K−1. This result would further accelerate intensive studies on SnSe nanostructures, especially focusing on the realistic device structures and sealing technologies for energy harvesting applications.

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Section: Resultssupporting

confidence: 83%

Oxidation-induced thermopower inversion in nanocrystalline SnSe thin film

Shimizu

Miwa²,

Kobayashi

et al. 2021

Sci Rep

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“…Br-doping obviously enhances the electrical conductivity, especially in the high temperature range, from 4.9 S cm -1 of the undoped sample to 29.5 S cm -1 of the x = 0:06 sample at 783 K. The absolute value of Seebeck coefficient and electrical conductivity in all Br-doped samples increase with the increasing temperature. This simultaneous enhancement in electrical conductivity and Seebeck coefficient was also reported on some p-type and n-type SnSe [30][31][32][33][34], indicating the nondegenerate characteristic of SnSe. Figure 1(c) shows the temperature dependence of the total and lattice thermal conductivity for SnSe 1-x Br x (x = 0~0.07) samples along the direction that is perpendicular to the SPS pressure.…”

Section: Resultssupporting

confidence: 74%

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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“…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%

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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Multipoint Defect Synergy Realizing the Excellent Thermoelectric Performance of n‐Type Polycrystalline SnSe via Re Doping

Cited by 78 publications

References 34 publications

Oxidation-induced thermopower inversion in nanocrystalline SnSe thin film

Oxidation-induced thermopower inversion in nanocrystalline SnSe thin film

Highly Textured N-Type SnSe Polycrystals with Enhanced Thermoelectric Performance

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

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