Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 11, Pages 4216-4223Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.01.093
Keywords
Bismuth telluride; Thin films; Electrochemical deposition; Crystal orientation; Thermoelectric; Transport properties
Categories
Funding
- The Swedish Foundation for Strategic Environmental Research (Mistra)
- Swedish Research Council
- Danish Strategic Research Council
- Danish National Research Foundation
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Bismuth telluride thin films have been synthesized by electrochemical deposition onto stainless steel substrates from acidic solutions. The influence of deposition variables on film composition, morphology and crystal orientation associated with the growth of the film was investigated by means of constant potential deposition and pulsed potential deposition. In-plane thermoelectric and transport properties of the electrodeposited films were measured. The carrier concentration of the electrodeposited films was found to be one order of magnitude larger than typically reported for optimized bulk bismuth telluride, which explains the unusually low Hall mobility and Seebeck coefficient values found for the electrodeposited films. Pulse deposited films showed slightly lower electrical resistivity and higher Seebeck coefficient due to the lower porosity and less preferred crystal orientation of the films compared to the continuously deposited films. Improvements of the film properties are necessary to make them viable for applications. (C) 2011 Elsevier Ltd. All rights reserved.
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