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Electrodeposition Of Bi_xsb_(2-x)te_y Thermoelectric Thin Films From Nitric Acid And Hydrochloric Acid Systems

机译:硝酸和盐酸体系电沉积Bi_xsb_(2-x)te_y热电薄膜

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摘要

The electrochemical behaviors of Bi~(Ⅲ), Te~(Ⅳ) and Sb~(Ⅲ) single ions and their mixtures were investigated in nitric acid and hydrochloric acid system separately. Based on which, Bi_xSb_(2-x)Te_y thermoelectric films were prepared by potentiostatic electrodeposition from the solutions with different concentrations of Bi~(Ⅲ), Te~(Ⅳ) and Sb~(Ⅲ) in the two acid systems. The morphologies, compositions, structures, Seebeck coefficients and resistivities of the deposited thin films were characterized and compared by ESEM (or FESEM), EDS, XRD, Seebeck coefficient measurement system and four-probe resistivity measuring device respectively. The results show that although Bi_xSb_(2-x)Te_y thermoelectric thin film which structure is consistent with the standard pattern of Bi_(0.5)Sb_(1.5)Te_3 can be gained in both of the two acid solutions by adjusting the deposition potential, their morphologies and thermoelectric properties have big differences in different acid solutions.
机译:分别研究了Bi〜(Ⅲ),Te〜(Ⅳ)和Sb〜(Ⅲ)单离子及其混合物在硝酸和盐酸体系中的电化学行为。在此基础上,利用两种体系中不同浓度的Bi〜(Ⅲ),Te〜(Ⅳ)和Sb〜(Ⅲ)溶液通过恒电位电沉积制备Bi_xSb_(2-x)Te_y热电薄膜。通过ESEM(或FESEM),EDS,XRD,Seebeck系数测量系统和四探针电阻率测量装置分别表征和比较了沉积薄膜的形貌,组成,结构,塞贝克系数和电阻率。结果表明,通过调节沉积电位,在两种酸溶液中均可得到Bi_xSb_(2-x)Te_y结构与Bi_(0.5)Sb_(1.5)Te_3的标准图案相一致的热电薄膜。在不同的酸溶液中,形态和热电性能差异很大。

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