首页|New thermoelectric semiconductors Pb5Sb12+xBi6-xSe32 with ultralow thermal conductivity

New thermoelectric semiconductors Pb5Sb12+xBi6-xSe32 with ultralow thermal conductivity

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Five new semiconductors Pb5Sb12+xBi6-xSe32(x=0,1,2,3,and 4)have been synthesized for the first time,which adopt pavonite-type structure and crystallize in monoclinic C2/m space group.The crystal structure is composed of two different types of polyhedral slabs.Slab-I is a galena-like structure motif that forms with[MSe6](M=Pb,Sb,and Bi)octahedra and slab-Ⅱ contains one octahedral[MSe6]block and paired squared pyramids[MSe5].Pb5Sb12+xBi6-xSe32 exhibits n-type semiconductor behaviors and the remarkable Seebeck coefficient from-64.1 μV K-1 for x=0 sample to-242 μV K-1 forx=4 sample at 300 K.Moreover,the Pb5Sb12Bi6Se32 has the highest carrier concentration of 1.35 × 1020 cm-3 in pavonite-type materials.The complex compositions,mixed occupancies of the cations,and quasi-two-dimensional structure lead to the low lattice thermal conduc-tivity(κlat)less than 0.48 W m-1 K-1 from 300 to 723 K,at which Pb5Sb16Bi2Se32 especially shows the ultralow value of 0.25 W m-1 K-1.As a result,the thermoelectric figure of merit,ZT～0.34 at 723 K,is obtained for the intrinsic Pb5Sb12Bi6Se32.

ThermoelectricSemiconductorsPavonite-type structurePb5Sb12+xBi6-xSe32Mixed occupanciesUltralow thermal conductivity

Ruizhi Yang、Xia Li、Weiping Guo、Zixuan Chen、Hongwei Ming、Zhong-Zhen Luo、Zhigang Zou

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Key Laboratory of Advanced Materials Technologies,International(Hong Kong,Macao and Taiwan)Joint Laboratory on Advanced Materials Technologies,College of Materials Science and Engineering,Fuzhou University,Fuzhou,350108,China

Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou,350108,China

State Key Laboratory of Photocatalysis on Energy and Environment,Fuzhou University,Fuzhou,350116,China

Eco-materials and Renewable Energy Research Center,College of Engineering and Applied Sciences,Nanjing University,Nanjing,210093,China

National Laboratory of Solid State Micros

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国家自然科学基金国家重点研发计划Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China福建省自然科学基金

521022182020YFA0710303GXRC-210042021J01594

2024

10.1016/j.cjsc.2024.100268

结构化学
中国化学会 中国科学院福建物质结构研究所

结构化学

影响因子：0.44
ISSN：0254-5861
年,卷(期)：2024.43(3)
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