Enhanced thermoelectric performance in ductile Ag2S-based materials via doping iodine

Jin, Liu; Xing, Tong; Gao, Zhiqiang; Liang, Jiayuan; Peng, Liming; Xiao, Jie; Qiu, Pengfei; Shi, Xun; Chen, Lidong

doi:10.1063/5.0065063

Cited by 25 publications

(33 citation statements)

References 20 publications

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“…Although Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 has a stable cubic structure and good plastic deformability, its thermoelectric properties are far from ideal. The carrier concentration of Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 is about 3.1 × 10 19 cm –3 at room temperature (Figure ), which is much higher than other ductile silver chalcogenides with excellent thermoelectric properties. ,,− , Due to the overhigh carrier concentration, the Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 sample has a σ as high as 1.9 × 10 5 S m –1 at room temperature (Figure a), while the room-temperature α of Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 is only −46 μV K –1 (Figure b). The resulted PF of Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 is about 4.0 μW cm –1 K –2 at 300 K (Figure S5a).…”

Section: Resultsmentioning

confidence: 98%

“…Temperature dependence of (a) thermal conductivity (κ), (b) lattice thermal conductivity (κ L ), and (c) zT for Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 + y Se samples. (d) Comparison of zT at 300 K for cubic Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 + 0.04Se with other ductile silver chalcogenides. ,,,, …”

Section: Resultsmentioning

confidence: 99%

“…The excessive Se compensates the intrinsic defects of the n-type Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 , resulting in decreased n H and σ, significantly increased α and μ H , and finally optimized electrical properties of the samples with excess Se. In comparison with other ductile silver chalcogenides, 23,24,26,28,42 the room-temperature PF of our samples is enhanced. The larger power factor ensures a higher energy output density after being made into thermoelectric devices.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Cubic Quaternary Silver Chalcogenide: A Promising Ductile Thermoelectric Inorganic

Xie

Chang

Liu

et al. 2022

ACS Appl. Energy Mater.

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Owing to their superior plastic deformability and tunable electrical and thermal transport properties, semiconducting silver chalcogenides exhibit unique advantages in the application of flexible thermoelectrics. In this work, we report the discovery of ductile Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 with a cubic structure. Due to the alloying effect, the high-temperature body-centered cubic structure is stabilized at room temperature for Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 , which is of vital importance for practical applications. The cubic Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 shows plastic deformability comparable to that of α-Ag 2 S, while the dimensionless thermoelectric figure of merit zT is only ∼0.06 due to its overhigh carrier concentration. A small amount of excessive Se [Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 + ySe (y = 0, 0.02, 0.03, 0.04, 0.05)] is added to reduce the carrier concentration and improve the thermoelectric properties. Owing to the effectively optimized carrier concentration, the thermoelectric power factor of the sample with y = 0.04 reaches 6.2 and 7.5 μW cm −1 K −2 at, respectively, 300 and 350 K, showing promising potential for near-room-temperature applications. Combined with the decreased total thermal conductivity, the zT values of the samples with y = 0.04 and 0.05 reach ∼0.3 at 300 K, which is five times that of Ag 2 S 0.4 (Se 0.6 Te 0.4 ) 0.6 . This study provides helpful guidance for the design of ductile silver chalcogenide semiconductors with stable and improved thermoelectric properties.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

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Cubic Quaternary Silver Chalcogenide: A Promising Ductile Thermoelectric Inorganic

Xie

Chang

Liu

et al. 2022

ACS Appl. Energy Mater.

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“…It is found that doping I (1 mol%), Cu (6 mol%), P (1 mol%), and Sb (5 mol%) in Ag 2 S would all result in precipitations and little change to thermoelectric performance. [ 99,100 ] Similarly, doping Ag 2 Se with various elements from IIIA, IVA, IB, and IIB groups by Conn et al. [ 22 ] also fails to tune the electrical properties.…”

Section: Ag2q Binary Thermoelectric Materialsmentioning

confidence: 99%

Ag₂Q‐Based (Q = S, Se, Te) Silver Chalcogenide Thermoelectric Materials

et al. 2022

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should have a high electrical conductivity (σ), a high Seebeck coefficient (S), and a low thermal conductivity (κ). [6][7][8][9] Cu 2 Q-and Ag 2 Q-based (Q = S, Se, Te) chalcogenides are exemplified with partially decoupled electrical and thermal transports. Over the past decade, Cu 2 Q materials have been widely investigated, showcasing remarkable zT values (around 2.0) at high temperatures. [10][11][12][13][14] As the homologous compounds sharing some common features, Ag 2 Q-based silver chalcogenides have arisen as a new spotlight in thermoelectrics (Figure 1) in recent years. Notably, the high zT values near unity of Ag 2 Se [15][16][17] make it a potential candidate for room-temperature thermoelectric application. In fact, Ag 2 Q compounds are "old" materials whose discovery can be traced back to the 19th century. [18][19][20] Their thermoelectric properties were first reported in the 1940s-1960s during which decent performance of Ag 2 Se and Ag 2 Te was unveiled. [21][22][23][24][25][26] After that, the study on Ag 2 Q had faded out over decades accompanying the low ebb of thermoelectric research. [27,28] Upon the turn of the century, especially over the last 10 years, the revival has come for thermoelectrics, bringing about great progress in transport theories, [29][30][31][32][33] advanced synthesis, [34][35][36][37] and characterization techniques, [38][39][40] and even the research paradigm. [41][42][43] All these progresses have boosted zT from 1 to 2 in not a few new or old thermoelectric materials. [44][45][46][47][48] In the same period, the booming of flexible/wearable electronics necessitates thermoelectric materials having both high performance and deformability at room temperature. [49][50][51][52] All these factors inspire people to revisit Ag 2 Q-based materials.Ag 2 Q-based materials exhibit a low lattice thermal conductivity originating from the large disorder or even liquid-like behavior of Ag ions. [53][54][55][56] They tend to show n-type conduction with a high electron mobility. [15,57,58] Apart from the thermoelectric properties, an exceptional room-temperature plasticity has been found in Ag 2 S-based materials (Figure 1), [59] which is quite rare and valuable for inorganic semiconductors. [60] Beyond the binary compounds, several ternary and even quaternary Ag 2 (S, Se, Te) alloys have been developed, exhibiting both high zT values and excellent plastic deformability. [54,[61][62][63] In addition, CuAgQ materials, the intermediate compounds between Ag 2 Q and Cu 2 Q, have also received wide attention as promising thermoelectric materials. [64][65][66][67] Considering the new, intriguing scientific issues and great application prospects of Ag 2 Q-based silver chalcogenide thermoelectric materials, here in this review, we try to provide the Thermoelectric technology provides a promising solution to sustainable energy utilization and scalable power supply. Recently, Ag 2 Q-based (Q = S, Se, Te) silver chalcogenides have come forth as potential thermoelectric materials that are endowed wi...

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“…To optimize ρ and k, specific microstructure, which includes various defects with desired properties, shape, size, dimensionality and etc., is usually formed via various approaches and ways of defect engineering [2][3][4][5]. Elemental doping is one of fruitful ways that is often applied to optimally tune the transport properties and, hence, enhance thermoelectric efficiency of material [6][7][8][9][10][11][12][13][14][15]. Dopant atoms can behave as donor or acceptor centres, resulting in reducing in ρ and enhancing in the electronic contribution to k. Besides, dopant atoms are effective scattering centres for electrons and phonons, resulting in enhancing in ρ and reducing in the phonon contribution to k, respectively.…”

Section: Introductionmentioning

confidence: 99%

Interconnected effects of Sm-doping on grain structure and transport properties of the textured Bi2-Sm Te2.7Se0.3 compounds

Yaprintsev

Vasil’ev

Ivanov

et al. 2022

Journal of Solid State Chemistry

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Enhanced thermoelectric performance in ductile Ag2S-based materials via doping iodine

Cited by 25 publications

References 20 publications

Cubic Quaternary Silver Chalcogenide: A Promising Ductile Thermoelectric Inorganic

Cubic Quaternary Silver Chalcogenide: A Promising Ductile Thermoelectric Inorganic

Ag₂Q‐Based (Q = S, Se, Te) Silver Chalcogenide Thermoelectric Materials

Interconnected effects of Sm-doping on grain structure and transport properties of the textured Bi2-Sm Te2.7Se0.3 compounds

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Enhanced thermoelectric performance in ductile Ag2S-based materials via doping iodine

Cited by 25 publications

References 20 publications

Cubic Quaternary Silver Chalcogenide: A Promising Ductile Thermoelectric Inorganic

Cubic Quaternary Silver Chalcogenide: A Promising Ductile Thermoelectric Inorganic

Ag2Q‐Based (Q = S, Se, Te) Silver Chalcogenide Thermoelectric Materials

Interconnected effects of Sm-doping on grain structure and transport properties of the textured Bi2-Sm Te2.7Se0.3 compounds

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Ag₂Q‐Based (Q = S, Se, Te) Silver Chalcogenide Thermoelectric Materials