Oriented growth of A2Te3 (A = Sb, Bi) films and their devices with enhanced thermoelectric performance |
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Authors: | Ming TanAuthor VitaeYao WangAuthor Vitae Yuan DengAuthor Vitae Zhiwei ZhangBingwei Luo Junyou Yang Yibin Xu |
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Affiliation: | a Beijing Key Laboratory of Special Functional Materials and Film, School of Chemistry and Environment, Beihang University, Beijing 100191, China b Advanced Energy Materials Laboratory, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China c Materials Database Station, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan |
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Abstract: | Oriented thermoelectric (TE) p-Sb2Te3 and n-Bi2Te3 thin films with special nanostructures have been synthesized by a simple vacuum thermal evaporation technique. The composition and microstructure of the films were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), presenting a well preferential crystal growth with dense slender columnar grains grown perpendicular to the substrate, and energy dispersive X-ray spectrum (EDX) indicating the compositions distribution in the films. The electric transport properties, i.e., conductivity and Seebeck coefficient, and the thermal transportation of the oriented films show optimized properties. Prototype devices were built up by p and n elements in series and parallel circuits. The largest output power and cooling could be achieved in Sb2Te3 parallel device with Pmax = 6.51 μW at ΔT = 106 K, and cooling of 4.1 K at 2 V. The 24-pair p-n couples series device could output maximum voltage of 313 mV at ΔT = 102 K. The power generation and the cooling of the devices show times enhanced TE performances than those consisting of common films. The results proved that introducing nanostructures into films is an effective choice to obtain high-efficient micro TE device. |
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Keywords: | Thermal evaporation technique Oriented growth Thermoelectric devices Thermoelectric properties |
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