Boosting Thermoelectric Performance of SnSe via Tailoring Band Structure, Suppressing Bipolar Thermal Conductivity, and Introducing Large Mass Fluctuation

Lü, Wenqi; Li, Shuang; Xu, Rui; Zhang, Jian; Li, Di; Feng, Zhenzhen; Zhang, Yongsheng; Tang, Guodong

doi:10.1021/acsami.9b17811

Cited by 41 publications

(30 citation statements)

References 67 publications

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“…which resulted in the enhancement in the thermoelectric performance of the material. Lu et al 118 enhanced the performance of polycrystalline SnSe by introducing large mass fluctuations by doping sulfur, which led to very low lattice thermal conductivity (0.13 W m −1 K −1 at 873 K). Still, this doping enhanced the bandgap of the SnSe, which lowered the electrical conduction and hence the power factor (low carrier concentration due to large bandgap).…”

Section: Various Applicationsmentioning

confidence: 99%

Tin-selenide as a futuristic material: properties and applications

et al. 2021

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Section: Various Applicationsmentioning

confidence: 99%

Tin-selenide as a futuristic material: properties and applications

et al. 2021

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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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“…Ag-doped (SnSe) 1– x (SnS) x polycrystals showed impressive low thermal conductivity as well as a high peak ZT of 1.67 due to nanoscale point defect scattering . Although polycrystalline SnSe has been promoted through the above-mentioned strategies, the majority of existing high- ZT polycrystalline SnSe involves less eco-friendly elements, either Pb ,,, or Cd. , Furthermore, these materials still show relatively low average ZT values. To fully realize their potential, thermoelectric materials must work over the entire, several-hundred Kelvin operating range .…”

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Lattice Strain Leads to High Thermoelectric Performance in Polycrystalline SnSe

Lou

Chen

et al. 2021

ACS Nano

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Polycrystalline SnSe materials with ZT values comparable to those of SnSe crystals are greatly desired due to facile processing, machinability, and scale-up application. Here manipulating interatomic force by harnessing lattice strains was proposed for achieving significantly reduced lattice thermal conductivity in polycrystalline SnSe. Large static lattice strain created by lattice dislocations and stacking faults causes an effective shortening in phonon relaxation time, resulting in ultralow lattice thermal conductivity. A combination of band convergence and resonance levels induced by Ga incorporation contribute to a sharp increase of Seebeck coefficient and power factor. These lead to a high thermoelectric performance ZT ∼ 2.2, which is a record high ZT reported so far for solution-processed SnSe polycrystals. Besides the high peak ZT, a high average ZT of 0.72 and outstanding thermoelectric conversion efficiency of 12.4% were achieved by adopting nontoxic element doping, highlighting great potential for power generation application at intermediate temperatures. Engineering lattice strain to achieve ultralow lattice thermal conductivity with the aid of band convergence and resonance levels provides a great opportunity for designing prospective thermoelectrics.

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Boosting Thermoelectric Performance of SnSe via Tailoring Band Structure, Suppressing Bipolar Thermal Conductivity, and Introducing Large Mass Fluctuation

Cited by 41 publications

References 67 publications

Tin-selenide as a futuristic material: properties and applications

Tin-selenide as a futuristic material: properties and applications

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

Lattice Strain Leads to High Thermoelectric Performance in Polycrystalline SnSe

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