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- Title
Effect of concentration of electrolyte on thermoelectric properties of electrodeposited Bi<sub>2</sub>Te<sub>3</sub> thin films.
- Authors
Khairnar, Vinod S.; Kulkarni, Anil N.; Lonikar, Vishal V.; Jadhav, Nilesh D.; Patil, Dipak P.; Gite, Anil B.; Kumar, Mirtunjay
- Abstract
The current thread of study focuses on tuning the properties of nanostructured Bi2Te3 films for thermoelectric applications, by optimizing electrodeposition conditions, such as the deposition potential, pH of the electrolyte, temperature, and concentration of the precursors in the solvent. In this paper, small coagulated masses of Bi2Te3 dendritic nanostructures were electrodeposited on a stainless-steel substrate for six different concentrations of Bi3+ ions in the electrolyte (varied from 2.5 to 15 mM) at previously optimized deposition potential and pH conditions. Systematic testing of electrodeposited films has been carried out to analyze the effect of variation of Bi3+ ions. Cyclic voltammetry studies revealed irreversible electrodeposition of Bi2Te3 films. A series of scanning electron micrographs revealed the evolution of small coagulated masses of dendritic nanostructures. Thermoelectric properties such as a Seebeck coefficient up to -45.81 μV/K and power factor up to 311 μW/cmK2 have been achieved for the deposited films. The results reveal significant variation in the thermoelectric properties as a function of the concentration of Bi3+ in the electrolyte through changes in the surface morphology and stoichiometry of the films. The analysis also revealed ideal concentrations of precursor ions to obtain Bi2Te3 as the dominant phase.
- Publication
Journal of Materials Science: Materials in Electronics, 2024, Vol 35, Issue 19, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-024-13138-7