Enhancing the thermoelectric performance of β-Cu 2 Se by incorporating SnSe

Liu, F.S.; Huang, Menglin; Gong, Zhe; Ao, W.Q.; Li, Y.; Li, J.Q.

doi:10.1016/j.jallcom.2015.08.154

Cited by 41 publications

(29 citation statements)

References 31 publications

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“…Subsequently, a relatively high μ H and low E def can be maintained. For example, when a large amount of the low intrinsic n H phase was introduced into Cu 2 Se, such as 10% SnSe with n H of ≈1 × 10 19 cm −3 , n H of (Cu 2 Se) 0.90 (SnSe) 0.10 can be reduced (Figure e) . Similar phenomena have also been found in CuGaSe 2 ‐included Cu 2 Se .…”

Section: Strategies For the Thermoelectric Property Enhancementsupporting

confidence: 61%

“…q is the electronegativity difference between Cu and Se/S . d) Schematic diagram of secondary phase functioning as modulation doping in p‐type Cu 2 Se/Cu 2 S‐based thermoelectric materials (holes as dominating carriers), e) Influence of additional SnSe secondary phase on n H of (Cu 2 Se) 1− m (SnSe) m . f) Schematic diagram for energy filtering effect of additional secondary phase due to quantum confinement effect.…”

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

“…It should be noted that the function of graphene/graphite in Cu 2 Se is still controversial where negative κ l can be estimated . Additionally, overintroduced the secondary phase can lead to unexpectedly increased κ l , such as SnSe in Cu 2 Se . It should be also noted that, when introducing proper amount of graphite/graphene networks or CuInSe 2 , nearly zero κ l has been achieved in Cu 2 Se, leading to ultrahigh zT values of >2.…”

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

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Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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Due to the nature of their liquid‐like behavior and high dimensionless figure of merit, Cu2X (X = Te, Se, and S)‐based thermoelectric materials have attracted extensive attention. The superionicity and Cu disorder at the high temperature can dramatically affect the electronic structure of Cu2X and in turn result in temperature‐dependent carrier‐transport properties. Here, the effective strategies in enhancing the thermoelectric performance of Cu2X‐based thermoelectric materials are summarized, in which the proper optimization of carrier concentration and minimization of the lattice thermal conductivity are the main focus. Then, the stabilities, mechanical properties, and module assembly of Cu2X‐based thermoelectric materials are investigated. Finally, the future directions for further improving the energy conversion efficiency of Cu2X‐based thermoelectric materials are highlighted.

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Section: Strategies For the Thermoelectric Property Enhancementsupporting

confidence: 61%

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

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Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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“…For example, the diffraction peaks of Cu 2 Se prepared by melting and hot-pressing methods coincide with the peaks of Cu 2−x Se (JCPDS 47-1448) [5]. Liu F. S. et al, employed the melt-quenching method to obtain a mixture of β-Cu2Se (PDF card number: 46-1129) and α-Cu 2 Se (PDF card number: 19-0401) phases at room temperature [17]. According to Yang et al, the high-temperature β-Cu 2 Se phase (JCPDS 06-0680) could be maintained at room temperature by applying the solvothermal synthesis technique [18].…”

Section: Microstructural Propertiesmentioning

confidence: 99%

Study of Conventional Sintered Cu2Se Thermoelectric Material

2019

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Lead-free thermoelectric material, copper chalcogenides, have been attracting much interest from many research and industrial applications owing to their high capability of harvesting energy from heat. The state-of-the-art copper chalcogenides are commonly fabricated by the spark plasma sintering (SPS) and hot pressing (HP) techniques. Those methods are still costly and complicated particularly when compared to the conventional solid-state sintering method. Here, we report an easy-to-fabricate lead-free copper(I)-selenium (Cu 2 Se) that was fabricated using the conventional sintering method. The fabrication conditions, including sintering temperature and dwelling time, have been systematically studied to optimize the thermoelectric performance of Cu 2 Se. The optimized zT value for the pure Cu 2 Se was found to be 1.2 for the sample sintered at 1173 K for 2 h. The study shows that Cu 2 Se developed using the simple and low-cost techniques could exhibit comparable thermoelectric performance when compared with those fabricated by the SPS method, which provides an alternative potential technique to synthesize high-performance thermoelectric materials in a cost-effective way for industrialization.

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“…The introduction of second phase is also considered as an efficient way to enhance zT by reducing thermal conductivity [22]. Recently, alloys of Cu 2 Se with SnSe has been investigated in which high figure of merit is obtained by retaining the intrinsic properties of the materials [23]. The ZnTe is a p-type transport semiconductor with wide direct bandgap of 2.26 eV at room temperature, having zinc blend crystal structure and variety of application in the field of photovoltaic, electrochemical cells and energy devices.…”

Section: Introductionmentioning

confidence: 99%

Pronounced effect of ZnTe nanoinclusions on thermoelectric properties of Cu2−x Se chalcogenides

et al. 2016

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(Mahmood N)) energy systems is the loss of energy such as heat production. However, thermoelectric materials have the ability to convert waste heat into electrical energy without making the system complex which makes these materials noiseless and environment friendly. The efficiency of thermoelectric materials can be characterized by the dimensionless figure of merit (zT = S 2 σT/ĸ), where S is the Seebeck coefficient, σ is the electrical conductivity, T is the absolute temperature and ĸ is the total thermal conductivity comprised of lattice thermal (ĸ l ) and electronic thermal (ĸ e ) conductivities. Hence, the efficiency of a thermoelectric material can be enhanced by increasing the power factor and decreasing the total thermal. As S and k are interconnected to each other, the only possible way to enhance the efficiency of thermoelectric materials is to break the linkage between electronic and thermal transport properties. It has been experimentally proved that by reducing the particle size from their mean free path, thermal conductivity can be suppressed by breaking the linkage between electrical and thermal transport properties [1]. Meanwhile, the thermoelectric efficiency has also been enhanced by using various techniques such as growth of nanowires [2,3], nanocomposites [1,4−6], superlattices [7] and thin films [8]. Bulk nanocomposites has also been reported to reduce thermal conductivity without affecting the electronic transport [5]. Presently, copper chalcogenides are getting more attention due to their simple chemical formula but complex crystal structures [9−12]. Among the other copper chalcogenides, copper selenide has been investigated as a potential thermoelectric material due to the mixed electronic and ionic ABSTRACT Metal chalcogenides especially Cu2−xSe has gained much attention in thermoelectric community due to its complex crystal structure and superionic behavior. Here, we report a facile method to improve the thermoelectric efficiency by introducing ZnTe nanoinclusions into the matrix of Cu2−xSe. As a result, a substantial improvement of 32% in electrical conductivity of Cu2−xSe-ZnTe composite is observed. The increase in electrical conductivity is at the expense of Seebeck coefficient, which slightly decreases the power factor of the composite samples than that of pure Cu2−xSe. Furthermore, the introduction of secondary phase facilitates in declining the total thermal conductivity of Cu2−xSe-ZnTe composite up to 34% by suppressing the lattice thermal contributions. Thus, the moderate power factor and lower thermal conductivity values result in an improved figure of merit (zT) value of ~0.40 in mid-range temperature (750 K) for Cu2−xSe-ZnTe composite with 10 wt.% of ZnTe, which is about 40% higher than that of its pure counterpart. Hence, it is believed that the incorporation of ZnTe nanoinclusions in the matrix of Cu2−xSe may be an important route to improve the thermoelectric properties of Cu2−xSe based compounds.

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Enhancing the thermoelectric performance of β-Cu 2 Se by incorporating SnSe

Cited by 41 publications

References 31 publications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Study of Conventional Sintered Cu2Se Thermoelectric Material

Pronounced effect of ZnTe nanoinclusions on thermoelectric properties of Cu2−x Se chalcogenides

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Enhancing the thermoelectric performance of β-Cu 2 Se by incorporating SnSe

Cited by 41 publications

References 31 publications

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

Study of Conventional Sintered Cu2Se Thermoelectric Material

Pronounced effect of ZnTe nanoinclusions on thermoelectric properties of Cu2−x Se chalcogenides

Contact Info

Product

Resources

About

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications