Preparation of Bi[sub 2]Te[sub 3] Films by Electrodeposition from Solution Containing Bi-Ethylenediaminetetraacetic Acid Complex and TeO[sub 2]

The electrodeposition of Bi-Te alloy films from nitric acid solutions containing and Bi-ethylenediaminetetraacetic acid (Bi-EDTA) complex was investigated. The product, composition, and surface morphology of Bi-Te alloy films were examined using an X-ray diffraction, inductively coupled plasma atomic emission spectroscopy, and scanning electron microscopy. In the solution containing and Bi-EDTA complex, bismuth deposits underpotentially in the potential range between −0.05 and −0.25 V, so that films are formed. In the potential region between −0.30 and −0.50 V, a limiting current is observed, the value of which is equal to the sum of the limiting currents observed for solutions containing or the Bi-EDTA complex. The composition of films deposited in this potential range can be controlled by the composition of the solution.