Preparation and Characterization of Electrodeposited Cu_xBi₂Te₃ Thermoelectric Films

Abstract:

Cu_xBi₂Te₃ films were prepared by chronopotentiometry electro-deposition on indium tin oxide (ITO)-coated glass substrates from an aqueous acidic electrolyte at room temperature. The films were deposited at the same current density but in electrolyte with different Cu²⁺ concentrations: 0.1, 0.25, 0.5, 0.75 or 1mM. The phase composition and morphology of the films were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and field emission scanning electron microscope, respectively. The electrical conductivity and Seebeck coefficient of the Cu_xBi₂Te₃ films were measured after being transferred onto a non-conductive rubberized fabric support. All the films showed n-type conduction with Seebeck coefficient in the range of-63 to-84μV/K, and the electrical conductivity in the range of 90 to 185S/cm. The film deposited from an electrolyte with 0.5mM Cu²⁺ showed higher power factor ~130 μW/K^-2m^-1.

• Periodical: Materials Science Forum (Volume 787)
• Pages: 205-209
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.787.205
• Online since: April 2014
• Authors: Yue Chao Hu, Zhi Gang Zou, Ke Feng Cai
• Keywords: Chronopotentiometry, Cu_xBi₂Te₃, Electrodeposition, Film

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