High thermoelectric performance and low thermal conductivity in K-doped SnSe polycrystalline compounds

Lin, Chan-Chieh; Ginting, Dianta; Kim, Gareoung; Ahn, Kyunghan; Rhyee, Jong‐Soo

doi:10.1016/j.cap.2018.09.011

Cited by 14 publications

(12 citation statements)

References 25 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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“…Therefore, there have been extensive follow-up investigations on SnSe and related materials aiming to further improve their TE performances through various approaches. [7][8][9][10][11][12][13][14][15][16][17] Among them, the most commonly used one is the chemical substitutions for Sn/Se or introducing vacancies.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced enhancement of thermoelectric power factor in pristine and hole-doped SnSe crystals

Qin

Liu

et al. 2019

RSC Adv.

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“…However, to the best of our knowledge, no reports are available on AC conductivity and dielectric properties of K-doped SnSe in a broad temperature range. Recently Chan-Chieh reported that potassium can enhance electrical transport properties with good solubility in SnSe [17]. Yue-Xing Chen et al reported that the introduction of K into SnSe has a dual effect: it enhances the carrier concentration and reduces the Sn oxides [18].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, an effort is made to study the optical and dielectric properties of K-doped SnSe samples. A very few reports exist on the K-doped SnSe prepared by solidstate methods, such as mechanical alloying and conventional melting [17][18][19][20][21]. No reports exist on K-doped SnSe using aqueous solution methods.…”

Section: Introductionmentioning

confidence: 99%

Optical and dielectric properties of potassium-doped tin selenide polycrystals

Nerella¹,

Suresh

Bathulapalli³

2022

J Mater Sci: Mater Electron

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In our current study, we have investigated the effect of potassium doping on AC conductivity and the dielectric properties of tin selenide (SnSe). Potassiumdoped SnSe (K x Sn 1-x Se with x = 0-20 mol%) polycrystals were synthesized via hydrothermal method. The phase of the synthesized samples was confirmed to be single phase with orthorhombic structure as obtained by X-ray diffraction. The average crystallite size for all the K x Sn 1-x Se samples was calculated using the Debye-Scherrer formula and they were found to be decreased as potassium (K) concentration increased. Scanning electron microscope revealed plate-like morphology for all K x Sn 1-x Se samples. Transmission electron microscope studies at high resolution showed plate-like morphology which is connected with small nanorods for the K 0.20 Sn 0.80 Se. Optical studies were carried out using UV-Vis-NIR diffuse reflectance spectroscopy. The bandgap values were found to be decreased as K concentration is increased. Temperature-dependent dielectric studies were studied for all K x Sn 1-x Se samples. Correlated barrier hopping is responsible for the transport of charge carriers in the conduction mechanism. Electrical modulus studies reveal a non-Debye-type dielectric relaxation phenomenon. The results of dielectric studies specify the application of K-doped SnSe in frequency related and capacitive storage devices.

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High thermoelectric performance and low thermal conductivity in K-doped SnSe polycrystalline compounds

Cited by 14 publications

References 25 publications

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

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

Pressure-induced enhancement of thermoelectric power factor in pristine and hole-doped SnSe crystals

Optical and dielectric properties of potassium-doped tin selenide polycrystals

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