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High Thermoelectric Performance in 2D Sb2Te3 and Bi2Te3 Nanoplate Composites Enabled by Energy Carrier Filtering and Low Thermal Conductivity
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2023-06-05 , DOI: 10.1021/acsaelm.3c00385 Tanner Q Kimberly 1 , Kamil M Ciesielski 2 , Xiao Qi 3 , Eric S Toberer 2 , Susan M Kauzlarich 1
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2023-06-05 , DOI: 10.1021/acsaelm.3c00385 Tanner Q Kimberly 1 , Kamil M Ciesielski 2 , Xiao Qi 3 , Eric S Toberer 2 , Susan M Kauzlarich 1
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Thermoelectrics are an important class of materials with great potential in alternative energy applications. In this study, two-dimensional (2D) nanoplates of the layered chalcogenides, Sb2Te3 and Bi2Te3, are synthesized and composites of the two are investigated for their thermoelectric properties. The two materials, Sb2Te3 and Bi2Te3, were synthesized as hexagonal, 2D nanoplates via a colloidal polyol route. The as-synthesized Sb2Te3 and Bi2Te3 vary drastically from one another in their lateral and vertical dimensions as revealed by scanning electron microscopy and atomic force microscopy. The single crystalline nanoplate nature is deduced by high-resolution transmission electron microscopy and selected area electron diffraction. Nanoplates have well-defined hexagonal facets as seen in the scanning and transmission electron microscopy images. The nanoplates were consolidated as an anisotropic nanostructured pellet via spark plasma sintering. Preferred orientation observed in the powder X-ray diffraction pattern and scanning electron microscopy images of the fractured pellets confirm the anisotropic structure of the nanoplates. Thermoelectric properties in the parallel and perpendicular directions were measured, revealing strong anisotropy with a significant reduction to thermal conductivity in the perpendicular direction due to increased phonon scattering at nanoplate interfaces. All compositions, except that of the 25% Bi2Te3 nanoplate composite, behave as degenerate semiconductors with increasing electrical resistivity as the temperature increases. The Seebeck coefficient is also increased dramatically in the nanocomposites, the highest reaching 210 μV/K for 15% Bi2Te3. The increase in Seebeck is attributed to energy carrier filtering at the nanoplate interfaces. Overall, these enhanced thermoelectric properties lead to a drastic increase in the thermoelectric performance in the perpendicular direction, with zT ∼ 1.26, for the 15% Bi2Te3 nanoplate composite at 450 K.
中文翻译：
通过载流子过滤和低导热率实现二维 Sb2Te3 和 Bi2Te3 纳米板复合材料的高热电性能
热电材料是一类重要的材料，在替代能源应用中具有巨大的潜力。在这项研究中，合成了层状硫属化物Sb 2 Te 3和Bi 2 Te 3的二维（2D）纳米板，并研究了两者复合材料的热电性能。这两种材料，Sb 2 Te 3和Bi 2 Te 3 ，通过胶体多元醇途径合成为六方二维纳米板。扫描电子显微镜和原子力显微镜显示，所合成的Sb 2 Te 3和Bi 2 Te 3在横向和纵向尺寸上彼此差异很大。通过高分辨率透射电子显微镜和选区电子衍射推断单晶纳米板的性质。从扫描和透射电子显微镜图像中可以看出，纳米板具有明确的六边形面。通过放电等离子烧结将纳米板固结为各向异性纳米结构颗粒。在粉末 X 射线衍射图和破碎颗粒的扫描电子显微镜图像中观察到的优选取向证实了纳米板的各向异性结构。测量了平行和垂直方向的热电性能，显示出强的各向异性，由于纳米板界面处声子散射的增加，垂直方向的热导率显着降低。 除25% Bi 2 Te 3纳米板复合材料外，所有组合物均表现为简并半导体，电阻率随温度升高而增加。纳米复合材料的塞贝克系数也显着增加，15% Bi 2 Te 3 的塞贝克系数最高达到210 μV/K。塞贝克的增加归因于纳米板界面处的能量载体过滤。总体而言，这些增强的热电性能导致 15% Bi 2 Te 3纳米板复合材料在 450 K 下垂直方向的热电性能急剧增加， zT ∼ 1.26。
更新日期：2023-06-05
中文翻译：
通过载流子过滤和低导热率实现二维 Sb2Te3 和 Bi2Te3 纳米板复合材料的高热电性能
热电材料是一类重要的材料，在替代能源应用中具有巨大的潜力。在这项研究中，合成了层状硫属化物Sb 2 Te 3和Bi 2 Te 3的二维（2D）纳米板，并研究了两者复合材料的热电性能。这两种材料，Sb 2 Te 3和Bi 2 Te 3 ，通过胶体多元醇途径合成为六方二维纳米板。扫描电子显微镜和原子力显微镜显示，所合成的Sb 2 Te 3和Bi 2 Te 3在横向和纵向尺寸上彼此差异很大。通过高分辨率透射电子显微镜和选区电子衍射推断单晶纳米板的性质。从扫描和透射电子显微镜图像中可以看出，纳米板具有明确的六边形面。通过放电等离子烧结将纳米板固结为各向异性纳米结构颗粒。在粉末 X 射线衍射图和破碎颗粒的扫描电子显微镜图像中观察到的优选取向证实了纳米板的各向异性结构。测量了平行和垂直方向的热电性能，显示出强的各向异性，由于纳米板界面处声子散射的增加，垂直方向的热导率显着降低。 除25% Bi 2 Te 3纳米板复合材料外，所有组合物均表现为简并半导体，电阻率随温度升高而增加。纳米复合材料的塞贝克系数也显着增加，15% Bi 2 Te 3 的塞贝克系数最高达到210 μV/K。塞贝克的增加归因于纳米板界面处的能量载体过滤。总体而言，这些增强的热电性能导致 15% Bi 2 Te 3纳米板复合材料在 450 K 下垂直方向的热电性能急剧增加， zT ∼ 1.26。
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