Enhanced thermoelectric properties of Bi 2 Te 3 doping Zn 4 Sb 3 by combinatorial approach
| Autor: | Hsu Shen Chu, Ren Jye Wu, Ping Hsing Yang, Shih Chun Tseng, Jenn Dong Hwang, Wen Hsuan Chao |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Doping Analytical chemistry Energy-dispersive X-ray spectroscopy Nanotechnology Surfaces and Interfaces General Chemistry Condensed Matter Physics Thermoelectric materials Surfaces Coatings and Films chemistry.chemical_compound chemistry Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect Materials Chemistry Bismuth telluride Thin film |
| Zdroj: | Surface and Coatings Technology. 231:34-37 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2012.03.006 |
| Popis: | Materials derived from Bi2Te3 compounds are known to have advantageous thermoelectric properties at room temperatures, with the potential to be used in either cooling or power generating applications. In this paper, the effect of doping Bi2Te3 thin films with Zn4Sb3 is studied using a combinatorial approach. Findings from this study demonstrate the structural and thermoelectric properties of Bi2Te3/(Zn4Sb3)x thin films grown with varying Zn4Sb3 concentrations ranging from x = 1 at.% to 16.5 at.%. The crystalline phase and variations in the composition of the thin films were determined using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). When doping Bi2Te3 with Zn4Sb3 concentrations of 5.1 at.%, a dramatic change in electrical resistivity was observed. It was found that the electrical resistivity decreased from 6.68 mΩ-cm to 1.63 mΩ-cm when compared with undoped Bi2Te3, at room temperature. The power factor of Bi2Te3/(Zn4Sb3)x (x = 5.1 at.%) is 2.4 μW/K2 cm, which is higher than as-grown Bi2Te3 (1.4 μW/K2 cm), even though the Seebeck coefficient (− 65.8 μV/K) is slightly less than Bi2Te3 (− 96.6 μV/K). The observed effects on the thermoelectric properties of these materials are extremely important for understanding the fundamental characteristics of Zn4Sb3/Bi2Te3 embedded thermoelectric composites. |
| Databáze: | OpenAIRE |
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