Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe

Wu, Haijun; Chang, Cheng; Feng, Dan; Xiao, Yu; Zhang, Xiao; Pei, Yanling; Liu, Zheng; Wu, Di; Gong, Shengkai; Chen, Yue; He, Jiaqing; Kanatzidis, Mercouri G.; Zhao, Li‐Dong

doi:10.1039/c5ee02423d

Cited by 295 publications

(314 citation statements)

References 46 publications

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“…A similar scenario is also observed in PbSe and PbS using the same methods, whose L‐ and Σ‐bands converge at 900 and 1000 K, respectively . The temperature of band convergence can also be estimated by the peak position in the measurement of Hall coefficient with temperature . The existence of a relevant second band in PbTe was indeed first found by the temperature dependent Hall measurement …”

Section: Band Engineering By Tuning the Chemical Bondsupporting

confidence: 70%

Chalcogenide Thermoelectrics Empowered by an Unconventional Bonding Mechanism

Cagnoni

Cojocaru‐Mirédin

et al. 2019

Adv Funct Materials

187

214

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Thermoelectric materials have attracted significant research interest in recent decades due to their promising application potential in interconverting heat and electricity. Unfortunately, the strong coupling between the material parameters that determine thermoelectric efficiency, i.e., the Seebeck coefficient, electrical conductivity, and thermal conductivity, complicates the optimization of thermoelectric energy converters. Main‐group chalcogenides provide a rich playground to alleviate the interdependence of these parameters. Interestingly, only a subgroup of octahedrally coordinated chalcogenides possesses good thermoelectric properties. This subgroup is also characterized by other outstanding characteristics suggestive of an exceptional bonding mechanism, which has been coined metavalent bonding. This conclusion is further supported by a map that separates different bonding mechanisms. In this map, all octahedrally coordinated chalcogenides with good performance as thermoelectrics are located in a well‐defined region, implying that the map can be utilized to identify novel thermoelectrics. To unravel the correlation between chemical bonding mechanism and good thermoelectric properties, the consequences of this unusual bonding mechanism on the band structure are analyzed. It is shown that features such as band degeneracy and band anisotropy are typical for this bonding mechanism, as is the low lattice thermal conductivity. This fundamental understanding, in turn, guides the rational materials design for improved thermoelectric performance by tailoring the chemical bonding mechanism.

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Section: Band Engineering By Tuning the Chemical Bondsupporting

confidence: 70%

Chalcogenide Thermoelectrics Empowered by an Unconventional Bonding Mechanism

Cagnoni

Cojocaru‐Mirédin

et al. 2019

Adv Funct Materials

187

214

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“…A zT of ~ 2.2 at 915 K was obtained in p-type PbTe-SrTe (4 mol%) doped with 2 mol% Na. 11 It has been proven that forming solid solutions is one of the most effective and practical ways to improve zT values in many TE materials such as Mg 2 Si 1-z Sn z 16,17 , Sn 1-x Mn x Te 6,18,19 , and PbTe based materials 5,10,20,21,22 . When solid solutions are formed, two significant effects can be expected, i.e.reducing lattice thermal conductivity and optimizing the electrical properties.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying

Yue

et al. 2016

Journal of Materiomics

Self Cite

139

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Enhanced thermoelectric performance in large size PbTe bulk materials with figure of merit zT> 2 by multi-functional alloying, Journal of Materiomics (2016),Multi-alloying of Mg and Se in PbTe system is applied for improving zT. A maximum zT of ~ 2.2 at 820 K has been reached. A high zT ~ 2.0 has also been repeated even in a large bulk (~ 200 g). AbstractForming solid solutions in PbTe based materials can simultaneously reduce lattice thermal conductivity and engineer the band structure to enhance the electrical properties. In this work, quarternary alloys of Pb 1-x Mg x Te 0.8 Se 0.2 are designed to improve the figure of merit zT. The significant roles of MgTe in enhancing electrical properties and reducing thermal conductivity of PbTe 0.8 Se 0.2 are investigated. A maximum zT of ~ 2.2 at 820 K has been achieved in PbTe 0.8 Se 0.2 with 8% MgTe. Subsequently, a large dimension bulk (~ 200 g, Φ42 mm × 18 mm) is fabricated and its homogeneity and the repeatability of high zT values are checked. It is shown that high zT ~ 2.0 can also be achieved even in such a large sample. These results highlight the multi-functional roles of quarternary alloying with Mg and Se, and demonstrate the realistic prospect of large-scale commercial fabrication in high performance PbTe-based thermoelectric materials.

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“…However, the toxicity associated with Pb causes severe threat to the environment and needs to be alternated for domestic usage . Hence, as its analog, tin telluride (SnTe) with the rock‐salt crystal structure has been inspired with great interests . Especially, SnTe is nontoxic, earth‐abundant, and environment friendly, which makes it a great alternative of PbTe in the real industry applications .…”

Section: Introductionmentioning

confidence: 99%

Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

Moshwan

Yang

Zou

et al. 2017

Adv Funct Materials

351

260

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As a key type of emerging thermoelectric material, tin telluride (SnTe) has received extensive attention because of its low toxicity and eco-friendly nature. The recent trend shows that band engineering and nanostructuring can enhance thermoelectric performance of SnTe as intermediate temperature (400-800 K) thermoelectrics, which provides an alternative for toxic PbTe with the same operational temperature. This review highlights the key strategies to enhance the thermoelectric performance of SnTe materials through band engineering, carrier concentration optimization, synergistic engineering, and structure design. A fundamental analysis elucidates the underpinnings for the property improvement. This comprehensive review will boost the relevant research with a view to work on further performance enhancement of SnTe materials.where k B , e, h, m*, µ, and L are the Boltzmann constant, the carrier charge, the Planck's constant, the effective mass of the charge carrier, the carrier mobility, and the Lorenz number, respectively. As can be seen, S, σ, and κ e are interacted and conflict, which raises the difficulty to obtain high ZT. To solve these conflicts, extensive research has been carried out through band engineering to optimize S and σ, [5][6][7] and structuring to reduce the κ l . [8][9][10][11][12] Figure 1a summarizes recent significant achievements in different thermoelectric materials including SnSe, [25] 3%Na-(PbTe) 0.8 (PbS) 0.2 , [70] Cu 2 S 0.5 Te 0.5 , [71] and GeSbTe. [72] As can be seen, the current ZT values of the thermoelectric materials lie between 1 and 2, [7,[13][14][15][16][17][18][19][20][21][22][23] resulting in the fact that the current thermoelectric energy conversion efficiency is comparable to the other energy conversion technologies, such as photovoltaic cells, [22] and solar thermal plants. [22] Considerable research has been continuing to further drive ZT higher than 2 with the predicted efficiency over 20%, [24,25] which can attract highly exciting prospect in the energy generation and conservation fields.In terms of the industrial and automotive applications, waste heats are generally produced in the temperature range of 500-900 K. [26][27][28] To recover such waste heats, developing high-performance mid-temperature (400-900 K) thermoelectric materials is highly desired. For this purpose, lead telluride (PbTe) and its alloys have been considered as a primary material system. [7,10,14,17,29] However, the toxicity associated with Pb causes severe threat to the environment and needs to be alternated for domestic usage. [30] Hence, as its analog, tin telluride (SnTe) [21,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] with the rock-salt crystal structure has been inspired with great interests. [32] Especially, SnTe is nontoxic, earth-abundant, and environment friendly, [45] which makes it

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Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe

Abstract: Heavy MnTe alloying can significantly improve the electrical and thermal transport properties of SnTeviamultiple approaches.

Cited by 295 publications

References 46 publications

Chalcogenide Thermoelectrics Empowered by an Unconventional Bonding Mechanism

Chalcogenide Thermoelectrics Empowered by an Unconventional Bonding Mechanism

Enhanced thermoelectric performance of PbTe bulk materials with figure of merit zT >2 by multi-functional alloying

Eco‐Friendly SnTe Thermoelectric Materials: Progress and Future Challenges

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