Enhanced thermoelectric performance of a BiCuSeO system via band gap tuning

Liu, Yong; Lan, Jinle; Xu, Wei; Liu, Yaochun; Pei, Yanling; Cheng, Bo; Liu, Dabo; Lin, Yuanhua; Zhao, Li‐Dong

doi:10.1039/c3cc44578j

Cited by 109 publications

(54 citation statements)

References 19 publications

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“…The zT of BiCuSeO has been increased to~1.5 through various approaches (see Fig. 17 b-f) including element doping (Mg, Sr, Ca, Ba, Pb at Bi site, Cu vacancies) [51,53,59,165,166], alloying (S, Te) [167], modulation doping [57] and texture treatment [56]. The findings and design methodology of this material are of valuable significance to investigation on similar layered compounds such as SnSe.…”

Section: Other High-performance Cu-based Chalcogenidesmentioning

confidence: 94%

Copper chalcogenide thermoelectric materials

et al. 2018

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Cu-based chalcogenides have received increasing attention as promising thermoelectric materials due to their high efficiency, tunable transport properties, high elemental abundance and low toxicity. In this review, we summarize the recent research progress on this large family compounds covering diamond-like chalcogenides and liquid-like Cu 2 X (X=S, Se, Te) binary compounds as well as their multinary derivatives. These materials have the general features of two sublattices to decouple electron and phonon transport properties. On the one hand, the complex crystal structure and the disordered or even liquid-like sublattice bring about an intrinsically low lattice thermal conductivity. On the other hand, the rigid sublattice constitutes the charge-transport network, maintaining a decent electrical performance. For specific material systems, we demonstrate their unique structural features and outline the structure-performance correlation. Various design strategies including doping, alloying, band engineering and nanostructure architecture, covering nearly all the material scale, are also presented. Finally, the potential of the application of Cu-based chalcogenides as high-performance thermoelectric materials is briefly discussed from material design to device development.

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Section: Other High-performance Cu-based Chalcogenidesmentioning

confidence: 94%

Copper chalcogenide thermoelectric materials

et al. 2018

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“…Recently, the related oxychalcogenides [BiO][CuQ] (Q¼ S, Se, Te), which consist of [Bi 2 O 2 ] 2 þ layers alternating with [Cu 2 Q 2 ] 2 À layers [17], have been identified as promising p-type thermoelectric materials. In this system, it has been shown that the substitution of Se by Te leads to an increase in electrical conductivity [18,19], together with a reduction in the thermal conductivity ( $ 0.97 W m À 1 K À 1 for BiOCuSe [20] and 0.68 W m À 1 K À 1 for BiOCuTe [21] at 373 K). Consequently, the figure of merit of the oxytelluride (ZT¼ 0.42 at 373 K) is significantly higher than that of the oxyselenide (ZT ¼0.15 at 373 K) [20,21].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterisation and thermoelectric properties of the oxytelluride Bi2O2Te

Luu

Vaqueiro

2015

Journal of Solid State Chemistry

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a b s t r a c tBi 2 O 2 Te was synthesised from a stoichiometric mixture of Bi, Bi 2 O 3 and Te by a solid state reaction. Analysis of powder X-ray diffraction data indicates that this material crystallises in the anti-ThCr 2 Si 2 structure type (space group I4/mmm), with lattice parameters a¼ 3.98025(4) and c¼ 12.70391(16) Å. The electrical and thermal transport properties of Bi 2 O 2 Te were investigated as a function of temperature over the temperature range 300 rT (K)r 665. These measurements indicate that Bi 2 O 2 Te is an n-type semiconductor, with a band gap of 0.23 eV. The thermal conductivity of Bi 2 O 2 Te is remarkably low for a crystalline material, with a value of only 0.91 W m À 1 K À 1 at room temperature.

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“…A variety of methods have been employed to tune the electrical and thermal properties, including doping to optimize charge carrier concentration3334353637 and tune the transport properties of carriers38, introducing Cu deficiencies39 and band gap tuning to enhance electrical conductivity40, and texturing to improve the mobility of carriers41. The crystal structure of BiCuSeO belongs to the ZrSiCuAs-type structure with the tetragonal P 4/ nmm space group that constitutes the alternately stacked (Bi 2 O 2 ) 2+ insulating layers and (Cu 2 Se 2 ) 2− conductive layers along the c -axis of the tetragonal cell, as illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Bi1−xLaxCuSeO as New Tunable Full Solar Light Active Photocatalysts

Wang

Liu

et al. 2016

Sci Rep

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Photocatalysis is attracting enormous interest driven by the great promise of addressing current energy and environmental crises by converting solar light directly into chemical energy. However, efficiently harvesting solar energy for photocatalysis remains a pressing challenge, and the charge kinetics and mechanism of the photocatalytic process is far from being well understood. Here we report a new full solar spectrum driven photocatalyst in the system of a layered oxyselenide BiCuSeO with good photocatalytic activity for degradation of organic pollutants and chemical stability under light irradiation, and the photocatalytic performance of BiCuSeO can be further improved by band gap engineering with introduction of La. Our measurements and density-functional-theory calculations reveal that the effective mass and mobility of the carriers in BiCuSeO can be tuned by the La-doping, which are responsible for the tunable photocatalytic activity. Our findings may offer new perspectives for understanding the mechanism of photocatalysis through modulating the charge mobility and the effective mass of carriers and provide a guidance for designing efficient photocatalyts.

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Enhanced thermoelectric performance of a BiCuSeO system via band gap tuning

Cited by 109 publications

References 19 publications

Copper chalcogenide thermoelectric materials

Copper chalcogenide thermoelectric materials

Synthesis, characterisation and thermoelectric properties of the oxytelluride Bi2O2Te

Bi1−xLaxCuSeO as New Tunable Full Solar Light Active Photocatalysts

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