Carrier control in CuAgSe by growth process or doping

Nguyen, Thi Huong; Nguyễn, Văn Quảng; Phạm, Anh Tuấn; Park, Jong Ho; Lee, Ji Eun; Lee, Jae Ki; Park, Su-Dong; Cho, Sunglae

doi:10.1016/j.jallcom.2020.157094

Cited by 8 publications

(21 citation statements)

References 18 publications

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“…It can be found that all the CuAgSe samples in the a-phase exhibit extremely low lattice thermal conductivity, which is in the range between 0.21 and 0.43 W m −1 K −1 at 630 K. This is lower than the results of many previous works, 22,25,[47][48][49] and is close to the lowest value of 0.20 W m −1 K −1 reported by Han et al 24 The reason for such low lattice thermal conductivity is apparently the ball milling method for the sample preparation, which produces large amounts of grain boundaries to enhance the phonon scattering. For a similar reason, the CuAgSe nanocrystals prepared by the aqueous approach achieved even lower k L of 0.20 W m −1 K −1 at 630 K. 24 The secondary phases may also act as phonon scattering centers, which further suppress the k L .…”

Section: Thermal Transport Performancementioning

confidence: 54%

“…For b-CuAgSe, PF in Se-decient CuAgSe is higher than that of CuAg-decient samples containing the secondary phase, which mainly originates from the The n-p conduction type transition in CuAgSe has been reported in several previous works, 19,[22][23][24]36,[46][47][48][49] but the results in these works show some conicts. For example, several works reported that there is no n-p transition in stoichiometric CuAgSe, 23,25,36,47,49 while many other works show clear n-p transition in the stoichiometric CuAgSe samples. 19,22,24,46,48 Nevertheless, it is a common result that the non-stoichiometric CuAgSe materials show n-p transition except for the samples with very slight Cu or Ag deciency.…”

Section: Electrical Transport Performancementioning

confidence: 82%

“…23,36,46 In addition, for the doped CuAgSe samples with foreign elements either in an Ag or Se sublattice, the n-p transition is no longer observed. 25,48,49 The above results show that the electrical transport is very sensitive to the chemical stoichiometry of CuAgSe, which is however very difficult to control during the sample preparation. By only changing the soaking time during growth, the stoichiometric CuAgSe can also switch from native n-type to p-type conduction in the a-phase.…”

Section: Electrical Transport Performancementioning

confidence: 87%

“…By only changing the soaking time during growth, the stoichiometric CuAgSe can also switch from native n-type to p-type conduction in the a-phase. 49 So it is easy to understand the inconsistency in the previous results.…”

Section: Electrical Transport Performancementioning

confidence: 97%

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Vacancy controlled n–p conduction type transition in CuAgSe with superior thermoelectric performance

et al. 2023

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Section: Thermal Transport Performancementioning

confidence: 54%

Section: Electrical Transport Performancementioning

confidence: 82%

Section: Electrical Transport Performancementioning

confidence: 87%

Section: Electrical Transport Performancementioning

confidence: 97%

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Vacancy controlled n–p conduction type transition in CuAgSe with superior thermoelectric performance

et al. 2023

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“…Better thermoelectric performance is found in CuAgSe: zT is ≈0.4 at room temperature [129,137,138] and exceeds 0.8 above 600 K. [129,140] Several routines have been employed to enhance the performance such as S or Te alloying, [138] tuning the atomic ratio, [137][138][139] and doping. [141,142] There is also an n-p transition in CuAgSe upon the phase transition with a dramatic reduction of electrical conductivity. [129] The single-phase CuAgTe cannot exist at room temperature but will transform to a single cubic phase above 460 K. [67] Roychowdhury et al reported a high zT of 1.6 at 670 K. [67] Ren et al Table 2.…”

Section: Te Propertiesmentioning

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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Low thermal conductivity and high thermoelectric performance in Cu2Se/CuAgSe composite materials

Yu,

Fu,

et al. 2024

J Mater Sci: Mater Electron

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Carrier control in CuAgSe by growth process or doping

Cited by 8 publications

References 18 publications

Vacancy controlled n–p conduction type transition in CuAgSe with superior thermoelectric performance

Vacancy controlled n–p conduction type transition in CuAgSe with superior thermoelectric performance

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

Low thermal conductivity and high thermoelectric performance in Cu2Se/CuAgSe composite materials

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Carrier control in CuAgSe by growth process or doping

Cited by 8 publications

References 18 publications

Vacancy controlled n–p conduction type transition in CuAgSe with superior thermoelectric performance

Vacancy controlled n–p conduction type transition in CuAgSe with superior thermoelectric performance

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

Low thermal conductivity and high thermoelectric performance in Cu2Se/CuAgSe composite materials

Contact Info

Product

Resources

About

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