Abstract
The authors examine Bi 2Te 3 deposition and stripping mechanisms by means of cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). Accumulated charges and related mass changes for Bi 2Te 3 deposition on working electrodes are measured in-situ. Linear scanning voltammetry and EQCM results are then used to propose a two-stage deposition process. During the initial stage, a thin layer of Bi-rich Bi 2Te 3 forms on the surface of the Au electrode, followed by a bulk deposition of Te-rich Bi 2Te 3. The composition variation is minor. During anodic linear stripping of a thin deposit, Bi 2Te 3 oxidation with a single peak was observed. Two oxidation peaks were detected during anodic stripping of a thick deposit-one corresponding to Bi 2Te 3 oxidation and the other to a combination of Bi 2Te 3 and Te oxidation. The Bi 2Te 3 deposit was synthesized via pulsed plating in order to study the effects of pulse parameters on deposit composition. Results indicate that Bi 2Te 3 film composition is affected by changes in pulse potential from potential pulse plating or by changes in current pulse plating relaxation time.
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