Annealing effects on the structural and electrical transport properties of n-type Bi2Te2.7Se0.3 thin films deposited by flash evaporation
| Autor: | Yuezhen Jiang, Xingkai Duan |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Electron mobility
Chemistry Analytical chemistry General Physics and Astronomy Surfaces and Interfaces General Chemistry Condensed Matter Physics Thermoelectric materials Surfaces Coatings and Films Van der Pauw method Electrical resistivity and conductivity Hall effect Seebeck coefficient Thermoelectric effect Thin film |
| Zdroj: | Applied Surface Science. 256:7365-7370 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2010.05.069 |
| Popis: | N-type Bi 2 Te 2.7 Se 0.3 thermoelectric thin films with thickness 800 nm have been deposited on glass substrates by flash evaporation method at 473 K. Annealing effects on the thermoelectric properties of Bi 2 Te 2.7 Se 0.3 thin films were examined in the temperature range 373–573 K. The structures, morphology and chemical composition of the thin films were characterized by X-ray diffraction, field emission scanning electron microscope and energy dispersive X-ray spectroscopy, respectively. Thermoelectric properties of the thin films have been evaluated by measurements of the electrical resistivity and Seebeck coefficient at 300 K. The Hall coefficients were measured at room temperature by the Van der Pauw method. The carrier concentration and mobility were calculated from the Hall coefficient. The films thickness of the annealed samples was measured by ellipsometer. When annealed at 473 K, the electrical resistivity and Seebeck coefficient are 2.7 mΩ cm and −180 μV/K, respectively. The maximum of thermoelectric power factor is enhanced to 12 μW/cm K 2 . |
| Databáze: | OpenAIRE |
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