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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Synergistic tuning of carrier and phonon scattering for high performance of n-type Bi2Te2.5Se0.5 thermoelectric material
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Synergistic tuning of carrier and phonon scattering for high performance of n-type Bi2Te2.5Se0.5 thermoelectric material

机译：n型Bi2Te2.5Se0.5热电材料的高性能载流子和声子散射的协同调节

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摘要

Polycrystalline Bi2Te2.5Se0.5 materials with different amounts of added MnTe2 have been fabricated by plasma activated sintering. XRD, SEM, EDS and HRTEM techniques and measurements of the electrical and thermal transport properties have been employed to study the effect of MnTe2 addition on the microstructure and the thermoelectric performance of Bi2Te2.5Se0.5 materials. Due to the substitution of Mn at the Bi sites, the XRD peaks shift towards a higher angle with an increase in the content of MnTe2, and the electron density increases; thus, the bipolar conduction is suppressed and accordingly shifts to a higher temperature. When the content of MnTe2 is over 3.0 at%, the dissolution of MnTe2 gets saturated, and some nanoinclusions with sizes of about 40-70 nm were observed and were identified as MnTe2 by EDS and HRTEM characterization. Due to the extra phonon scattering by the Mn-Bi' point defects and MnTe2 nanoinclusions, the phonon thermal conductivity decreased significantly. As a result, a maximum ZT of 1.0 at 523 K was achieved in the sample with 3.0 at% MnTe2, which is about a 150 K degree shift and a 100% improvement at this temperature compared with the conventional n-type Bi2Te3-based materials.
机译：已经通过等离子活化烧结制备了具有不同量的MnTe 2的多晶Bi 2 Te 2.5 Se 0.5材料。 XRD，SEM，EDS和HRTEM技术以及电和热传输性能的测量已被用来研究MnTe2添加对Bi2Te2.5Se0.5材料的微观结构和热电性能的影响。由于Bi位点上的Mn被取代，随着MnTe 2含量的增加，XRD峰向较高的角度移动，电子密度增加。因此，双极传导受到抑制，并因此转移到更高的温度。当MnTe2的含量超过3.0 at％时，MnTe2的溶解达到饱和，观察到一些尺寸约为40-70 nm的纳米夹杂物，并通过EDS和HRTEM鉴定为MnTe2。由于Mn-Bi'点缺陷和MnTe2纳米夹杂物引起的额外声子散射，声子的热导率显着下降。结果，在具有3.0 at％MnTe2的样品中，在523 K处获得的最大ZT为1.0，与常规的n型Bi2Te3基材料相比，该位移约为150 K度，并且在该温度下提高了100％ 。

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