Polycrystalline BiCuSeO oxide as a potential thermoelectric material

Fu, Li; Li, Jing‐Feng; Zhao, Li‐Dong; Xiang, Kai; Liu, Yong; Zhang, Bo Ping; Lin, Yuan; Nan, Ce Wen; Zhu, Hong

doi:10.1039/c2ee21274a

Cited by 255 publications

(204 citation statements)

References 51 publications

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“…[80] According to solid state physical principles, the ZT value for bulk mate rials with a single parabolic band (SPB) along a certain direc tion can be given as: [4] The timeline for thermoelectric bulk materials with 2D structures, showing data from a superlattice, [8] SnSe, [11,[19][20][21] Bi 2 Te 3 , [12,14,16,17,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] BiCuSeO, [12,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] Na x CoO 2 , [57,58] Ca 3 Co 4 O 9 , [5...…”

Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

Promising Thermoelectric Bulk Materials with 2D Structures

2017

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Given that more than two thirds of all energy is lost, mostly as waste heat, in utilization processes worldwide, thermoelectric materials, which can directly convert waste heat to electricity, provide an alternative option for optimizing energy utilization processes. After the prediction that superlattices may show high thermoelectric performance, various methods based on quantum effects and superlattice theory have been adopted to analyze bulk materials, leading to the rapid development of thermoelectric materials. Bulk materials with two‐dimensional (2D) structures show outstanding properties, and their high performance originates from both their low thermal conductivity and high Seebeck coefficient due to their strong anisotropic features. Here, the advantages of superlattices for enhancing the thermoelectric performance, the transport mechanism in bulk materials with 2D structures, and optimization methods are discussed. The phenomenological transport mechanism in these materials indicates that thermal conductivities are reduced in 2D materials with intrinsically short mean free paths. Recent progress in the transport mechanisms of Bi2Te3‐, SnSe‐, and BiCuSeO‐based systems is summarized. Finally, possible research directions to enhance the thermoelectric performance of bulk materials with 2D structures are briefly considered.

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Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

Promising Thermoelectric Bulk Materials with 2D Structures

2017

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“…18 The thermal conductivities at low temperatures ranging from 4 to 350 K were measured using a physical property measurement system (PPMS-9T, Quantum Design, San Diego, CA, USA).…”

Section: Thermoelectric Transport Property Measurementmentioning

confidence: 99%

“…14,15 In particular, spark plasma sintering (SPS) combined with mechanical alloying (MA) has been increasingly used as a facile powder process for synthesizing thermoelectric materials. [16][17][18][19] Nevertheless, for the ZT enhancement of Bi 2 Te 3 -based alloys fabricated by MA and SPS, the optimal composition needs to be redefined; it is no longer the same as the ingots because of massive point defects and strong donor-like effect. 19,20 Our group has already confirmed that Bi 2 Te 2.2 Se 0.8 is the optimal composition for samples prepared by MA and SPS.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric performance enhancement in n-type Bi2(TeSe)3 alloys owing to nanoscale inhomogeneity combined with a spark plasma-textured microstructure

Pan

2016

NPG Asia Mater

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Bi 2 Te 3 is a good thermoelectric compound that can be adjusted to p-or n-type with corresponding substitutions; however, less progress has been achieved for the property enhancement of n-type Bi 2 (TeSe) 3 compared with p-type (BiSb) 2 Te 3 . Textured n-type Bi 2 (TeSe) 3 with an enhanced thermoelectric performance has been developed in this study by combining texturing with in situ nanostructuring effects. The spark plasma-textured structure boosts the electrical transport properties and the power factors as benefits of the layered microstructure. It also leads to a simultaneous rise in the thermal conductivity along the a-axis. We developed a method to suppress increases in the thermal conductivity by inducing nanostructures, such as highly distorted regions and nanoscopic defect clusters, as well as dislocation loops that can form when texturing occurs at an optimized temperature. In this work, textured n-type Bi 2 (TeSe) 3 materials having enhanced thermoelectric performances within a low temperature range are developed with a maximum dimensionless figure of merit (ZT max ) exceeding 1.1 at 473 K. The present method, which synergetically utilizes the texturing and nanostructuring effects, could also be applied to other thermoelectric compounds having layered structures.

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“…Specifically, electrical conductivity was increased by Sr doping, introducing Cu deficiencies and Ba heavy metal doping. [21][22][23][24][25] Although promising thermoelectric properties have been observed with BiCuSeO compounds, [21][22][23][24][25] surprisingly little is known about their microstructure and the main cause of their low thermal conductivity. In this paper, we perform a systematic evaluation of the BiCuSeO system, including the structural, transport, optical and elastic properties, using a combination of electron microscopy observations and electronic structure calculations.…”

Section: Introductionmentioning

confidence: 99%

“…20 Recently, we reported a quaternary BiCuSeO compound that exhibits very low thermal conductivity. [21][22][23][24][25] High ZT values were achieved using this system by optimizing the electrical transport properties. Specifically, electrical conductivity was increased by Sr doping, introducing Cu deficiencies and Ba heavy metal doping.…”

Section: Introductionmentioning

confidence: 99%

High thermoelectric performance of oxyselenides: intrinsically low thermal conductivity of Ca-doped BiCuSeO

et al. 2013

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We report on the high thermoelectric performance of p-type polycrystalline BiCuSeO, a layered oxyselenide composed of alternating conductive (Cu 2 Se 2 ) 2 À and insulating (Bi 2 O 2 ) 2 þ layers. The electrical transport properties of BiCuSeO materials can be significantly improved by substituting Bi 3 þ with Ca 2 þ . The resulting materials exhibit a large positive Seebeck coefficient of B þ 330 lV K À1 at 300 K, which may be due to the 'natural superlattice' layered structure and the moderate effective mass suggested by both electronic density of states and carrier concentration calculations. After doping with Ca, enhanced electrical conductivity coupled with a moderate Seebeck coefficient leads to a power factor of B4.74 lW cm À1 K À2 at 923 K. Moreover, BiCuSeO shows very low thermal conductivity in the temperature range of 300 (B0.9 W m À1 K À1 ) to 923 K (B0.45 W m À1 K À1 ). Such low thermal conductivity values are most likely a result of the weak chemical bonds (Young's modulus, EB76.5 GPa) and the strong anharmonicity of the bonding arrangement (Gruneisen parameter, cB1.5). In addition to increasing the power factor, Ca doping reduces the thermal conductivity of the lattice, as confirmed by both experimental results and Callaway model calculations. The combination of optimized power factor and intrinsically low thermal conductivity results in a high ZT of B0.9 at 923 K for Bi 0.925 Ca 0.075 CuSeO.

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Polycrystalline BiCuSeO oxide as a potential thermoelectric material

Cited by 255 publications

References 51 publications

Promising Thermoelectric Bulk Materials with 2D Structures

Promising Thermoelectric Bulk Materials with 2D Structures

Thermoelectric performance enhancement in n-type Bi2(TeSe)3 alloys owing to nanoscale inhomogeneity combined with a spark plasma-textured microstructure

High thermoelectric performance of oxyselenides: intrinsically low thermal conductivity of Ca-doped BiCuSeO

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