材料科学
磁电阻
散射
纹理(宇宙学)
塞贝克系数
凝聚态物理
热电效应
声子散射
弱局部化
电阻率和电导率
拓扑绝缘体
热电材料
热导率
复合材料
光学
热力学
磁场
电气工程
物理
量子力学
人工智能
计算机科学
图像(数学)
工程类
作者
Samaneh Bayesteh,Sebastian Sailler,H. Schlörb,Ran He,Gabi Schierning,Kornelius Nielsch,Nicolás Pérez
标识
DOI:10.1016/j.mtphys.2022.100669
摘要
We report on the effect of artificially generated textures of Bi2Se3 in thermoelectric performance and low-temperature magnetoresistance. A set of texturized nanograined Bi2Se3 samples was investigated, ranging from predominantly c-axis texture to random texture. c-axis oriented layered domains rendered the samples highly conducting due to drastically enhanced mobility, up to 1600 cm2V−1s−1 at low temperature, and enhanced both carrier concentration and electrical conductivity. The largest power factor of 800 μWm−1K−2 and highest zT≈ 0.14 both at 300K were observed in a sample with a predominantly layered and c-axis oriented texture. The random texture reduced the thermal conductivity, while the Seebeck coefficient showed no particular correlation with the texture. We have shown that the milling procedure generated a higher degree of disorder by increasing the milling frequency. As a result, the carrier scattering mechanism in the samples changed from mostly electron-phonon interaction at 5Hz to disorder-related scattering at 10Hz and 20Hz milling frequency. The weak antilocalization effect was observed in the magnetoresistance of pressed samples with different textures, pointing towards surface-like transport channels. The Hikami-Larkin-Nagaoka (HLN) model was used to evaluate the phase coherence length, resulting in a high value of roughly 600 nm regardless of the texture. However, a larger number of surface-like transport channels was obtained for the samples with random texture.
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