Xudong Wu, Junjie Ding, Wenjun Cui, Weixiao Lin, Zefan Xue, Zhi Yang, Jiahui Liu, Xiaolei Nie, Wanting Zhu, Gustaaf Van Tendeloo, Xiahan Sang
{"title":"通过界面工程增强 Bi2-xSbxTe3 纳米薄片的电学特性","authors":"Xudong Wu, Junjie Ding, Wenjun Cui, Weixiao Lin, Zefan Xue, Zhi Yang, Jiahui Liu, Xiaolei Nie, Wanting Zhu, Gustaaf Van Tendeloo, Xiahan Sang","doi":"10.1002/eem2.12755","DOIUrl":null,"url":null,"abstract":"<p>The structure–property relationship at interfaces is difficult to probe for thermoelectric materials with a complex interfacial microstructure. Designing thermoelectric materials with a simple, structurally-uniform interface provides a facile way to understand how these interfaces influence the transport properties. Here, we synthesized Bi<sub>2−<i>x</i></sub>Sb<sub><i>x</i></sub>Te<sub>3</sub> (<i>x</i> = 0, 0.1, 0.2, 0.4) nanoflakes using a hydrothermal method, and prepared Bi<sub>2−<i>x</i></sub>Sb<sub><i>x</i></sub>Te<sub>3</sub> thin films with predominantly (0001) interfaces by stacking the nanoflakes through spin coating. The influence of the annealing temperature and Sb content on the (0001) interface structure was systematically investigated at atomic scale using aberration-corrected scanning transmission electron microscopy. Annealing and Sb doping facilitate atom diffusion and migration between adjacent nanoflakes along the (0001) interface. As such it enhances interfacial connectivity and improves the electrical transport properties. Interfac reactions create new interfaces that increase the scattering and the Seebeck coefficient. Due to the simultaneous optimization of electrical conductivity and Seebeck coefficient, the maximum power factor of the Bi<sub>1.8</sub>Sb<sub>0.2</sub>Te<sub>3</sub> nanoflake films reaches 1.72 mW m<sup>−1</sup> K<sup>−2</sup>, which is 43% higher than that of a pure Bi<sub>2</sub>Te<sub>3</sub> thin film.</p>","PeriodicalId":11554,"journal":{"name":"Energy & Environmental Materials","volume":null,"pages":null},"PeriodicalIF":13.0000,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eem2.12755","citationCount":"0","resultStr":"{\"title\":\"Enhanced Electrical Properties of Bi2−xSbxTe3 Nanoflake Thin Films Through Interface Engineering\",\"authors\":\"Xudong Wu, Junjie Ding, Wenjun Cui, Weixiao Lin, Zefan Xue, Zhi Yang, Jiahui Liu, Xiaolei Nie, Wanting Zhu, Gustaaf Van Tendeloo, Xiahan Sang\",\"doi\":\"10.1002/eem2.12755\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The structure–property relationship at interfaces is difficult to probe for thermoelectric materials with a complex interfacial microstructure. Designing thermoelectric materials with a simple, structurally-uniform interface provides a facile way to understand how these interfaces influence the transport properties. Here, we synthesized Bi<sub>2−<i>x</i></sub>Sb<sub><i>x</i></sub>Te<sub>3</sub> (<i>x</i> = 0, 0.1, 0.2, 0.4) nanoflakes using a hydrothermal method, and prepared Bi<sub>2−<i>x</i></sub>Sb<sub><i>x</i></sub>Te<sub>3</sub> thin films with predominantly (0001) interfaces by stacking the nanoflakes through spin coating. The influence of the annealing temperature and Sb content on the (0001) interface structure was systematically investigated at atomic scale using aberration-corrected scanning transmission electron microscopy. Annealing and Sb doping facilitate atom diffusion and migration between adjacent nanoflakes along the (0001) interface. As such it enhances interfacial connectivity and improves the electrical transport properties. Interfac reactions create new interfaces that increase the scattering and the Seebeck coefficient. 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Enhanced Electrical Properties of Bi2−xSbxTe3 Nanoflake Thin Films Through Interface Engineering
The structure–property relationship at interfaces is difficult to probe for thermoelectric materials with a complex interfacial microstructure. Designing thermoelectric materials with a simple, structurally-uniform interface provides a facile way to understand how these interfaces influence the transport properties. Here, we synthesized Bi2−xSbxTe3 (x = 0, 0.1, 0.2, 0.4) nanoflakes using a hydrothermal method, and prepared Bi2−xSbxTe3 thin films with predominantly (0001) interfaces by stacking the nanoflakes through spin coating. The influence of the annealing temperature and Sb content on the (0001) interface structure was systematically investigated at atomic scale using aberration-corrected scanning transmission electron microscopy. Annealing and Sb doping facilitate atom diffusion and migration between adjacent nanoflakes along the (0001) interface. As such it enhances interfacial connectivity and improves the electrical transport properties. Interfac reactions create new interfaces that increase the scattering and the Seebeck coefficient. Due to the simultaneous optimization of electrical conductivity and Seebeck coefficient, the maximum power factor of the Bi1.8Sb0.2Te3 nanoflake films reaches 1.72 mW m−1 K−2, which is 43% higher than that of a pure Bi2Te3 thin film.
期刊介绍:
Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.