Triply degenerate nodal points in 
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Guo, Peng‐Jie; Yang, Huan-Cheng; Liu, Kai; Lu, Zhong-Yi

doi:10.1103/physrevb.98.045134

Cited by 28 publications

(31 citation statements)

References 32 publications

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“…SnSe possesses a typical double-layered structure, [10] similar to SnS and black phosphorus. [207,208] In a unit cell of SnSe, there are eight atoms joined with strong hetero-polar bonds, consisting of two planes of zigzag-like chain. [209,210] The adjacent layers are mainly bound by a combination of van der Waals forces and a long-range electrostatic attractions, [209,211] making it easy to crack along {100} atomic planes when shear force applied, [212] and this is also the reason why the growth SnSe single crystals through the solution route are mainly plate-or belt-like.…”

Section: Crystal Structurementioning

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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Section: Crystal Structurementioning

confidence: 99%

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

2020

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“…[ 3,[13][14][15][16] The desirable bandgap, high absorption coeffi cient (>10 4 cm −1 ) and sensitivity of its properties to changes in dimensionality, and elemental composition make SnS a promising material for optoelectronic applications. [ 15,[17][18][19][20][21] Furthermore, combined SnS and SnS 2 heterostructures have been reported to show improved photocatalytic performance on photodegrading organic dyes, compared with that of as-synthesized pure phases of SnS and SnS 2 . [ 4 ] Selective pure phase synthesis of single crystalline tin sulfi des is a challenging task due to the high sensitivity of the different phases to growth conditions.…”

Section: Introductionmentioning

confidence: 99%

Phase Engineering of 2D Tin Sulfides

Mutlu

Wickramaratne

et al. 2016

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Tin sulfides can exist in a variety of phases and polytypes due to the different oxidation states of Sn. A subset of these phases and polytypes take the form of layered 2D structures that give rise to a wide host of electronic and optical properties. Hence, achieving control over the phase, polytype, and thickness of tin sulfides is necessary to utilize this wide range of properties exhibited by the compound. This study reports on phase-selective growth of both hexagonal tin (IV) sulfide SnS2 and orthorhombic tin (II) sulfide SnS crystals with diameters of over tens of microns on SiO2 substrates through atmospheric pressure vapor-phase method in a conventional horizontal quartz tube furnace with SnO2 and S powders as the source materials. Detailed characterization of each phase of tin sulfide crystals is performed using various microscopy and spectroscopy methods, and the results are corroborated by ab initio density functional theory calculations.

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“…Indeed, the first-principles calculations predict a high Seebeck coefficient (S) and low thermal conductivity (κ) for SnS. [32,33] The recent study using polycrystalline SnS samples was rather disappointing in its outcome as it resulted in a relatively low zT value of 0.65 at 850 K, [34] suffering chiefly from the low power factors of the polycrystalline samples. The prospect of achieving significantly higher power factors with single crystal samples of SnS and the lack of information regarding their transport properties have motivated us to perform a comprehensive study of the TE performance of single-crystalline forms of SnS.…”

mentioning

confidence: 99%

Sodium‐Doped Tin Sulfide Single Crystal: A Nontoxic Earth‐Abundant Material with High Thermoelectric Performance

Wang

et al. 2018

Advanced Energy Materials

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the total thermal conductivity consisting of the lattice part (κ L ) and the electronic part (κ e ). [6] Some of these parameters (S, ρ, and κ e ), however, are mutually interdependent and strongly coupled by way of the carrier concentration, making it difficult to attain high TE performance (zT) without making some compromise. Fortunately, in the past decade, several general strategies have been developed to achieve high zT in various materials. [7,8] Lowering the lattice thermal conductivity (κ L ), which is relatively independent of other parameters, is a comparatively easy method. Other well-documented methods for enhancing phonon scattering include nanostructuring, [9][10][11] dislocations, [12,13] point defects, [14][15][16][17] and strong lattice anharmonicity. [18][19][20] Additional strategies to boost the power factor (S 2 ρ −1 ) include carrier concentration optimization, [21,22] band convergence, [23,24] and creating band resonance levels. [25] Typically, practical TE materials are polycrystalline structures with grain boundaries that help to maintain a low lattice thermal conductivity but inevitably also degrade the charge carrier mobility. Recently, bulk SnSe [26][27][28][29][30] and In 4 Se 3[31] single crystals have attracted increasing amounts of attention. The layered structure and strong lattice anharmonicity of these materials cause ultralow lattice thermal conductivity, independent of grain boundary phonon scattering. Therefore, such single crystalline compounds are expected to yield superior performance as both high mobility and low lattice thermal conductivity can be maintained simultaneously. For instance, the ultrahigh zT of Lead-free tin sulfide (SnS), with an analogous structure to SnSe, has attracted increasing attention because of its theoretically predicted high thermoelectric performance. In practice, however, polycrystalline SnS performs rather poorly as a result of its low power factor. In this work, bulk sodium (Na)-doped SnS single crystals are synthesized using a modified Bridgman method and a detailed transport evaluation is conducted. The highest zT value of ≈1.1 is reached at 870 K in a 2 at% Na-doped SnS single crystal along the b-axis direction, in which high power factors (2.0 mW m −1 K −2 at room temperature) are realized. These high power factors are attributed to the high mobility associated with the single crystalline nature of the samples as well as to the enhanced carrier concentration achieved through Na doping. An effective single parabolic band model coupled with first-principles calculations is used to provide theoretical insight into the electronic transport properties. This work demonstrates that SnS-based single crystals composed of earth-abundant, low-cost, and nontoxic chemical elements can exhibit high thermoelectric performance and thus hold potential for application in the area of waste heat recovery.

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Triply degenerate nodal points in RRh6Ge4(R=Y,La,Lu)

Cited by 28 publications

References 32 publications

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

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

Phase Engineering of 2D Tin Sulfides

Sodium‐Doped Tin Sulfide Single Crystal: A Nontoxic Earth‐Abundant Material with High Thermoelectric Performance

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