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首页> 外文期刊>ACS applied materials & interfaces >High Porosity in Nanostructured n-Type Bi2Te3 Obtaining Ultralow Lattice Thermal Conductivity
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High Porosity in Nanostructured n-Type Bi2Te3 Obtaining Ultralow Lattice Thermal Conductivity

机译：纳米结构N型Bi2Te3中的高孔隙率获得超级晶格导热率

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摘要

Porous structure possesses full potentials to develop high-performance thermoelectric materials with low lattice thermal conductivity. In this study, the n-type porous nanostructured Bi2Te3 pellet is fabricated by sintering Bi2Te3 nanoplates synthesized with a facile solvothermal method. With adequate sublimations of Bi2TeO5 during the spark plasma sintering, homogeneously distributed pores and dense grain boundaries are successfully introduced into the Bi2Te3 matrix, causing strong phonon scatterings, from which an ultralow lattice thermal conductivity of <0.1 W m(-1) K-1 is achieved in the porous nanostructured Bi2Te3 pellet. With the well-maintained decent electrical performance, a power factor of 10.57 mu W cm(-1) K-2 at 420 K, as well as the reduced lattice thermal conductivity, secured a promising zT value of 0.97 at 420 K, which is among the highest values reported for pure n-type Bi2Te3. This study provides the insight of realizing ultralow lattice thermal conductivity by synergistic phonon scatterings of pores and nanostructure in the n-type Bi2Te3-based thermoelectric materials.
机译：多孔结构具有开发具有低晶格导热性的高性能热电材料的潜力。在该研究中，通过烧结用容器溶液方法合成的Bi2Te3纳米板制造n型多孔纳米结构Bi2Te3颗粒。在火花等离子体烧结期间，通过足够的Bi2teO5升华，均匀分布的孔和致密的晶界被成功地引入Bi2Te3基质中，导致强子散射，从中散射强晶格导热率<0.1W m（-1）k-1在多孔纳米结构Bi2Te3颗粒中实现。通过保持良好的不良电性能，420 k处为10.57μW（-1）k-2的功率因数，以及降低的晶格导热率，确保了420 k的有希望的0.97的Zt值，即在纯n型Bi2te3报告的最高值中。本研究提供了通过在基于N型Bi2Te3的热电材料中的孔和纳米结构的协同声子散射来实现超级晶格导热率的洞察。

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