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Influence of pulsed electrodeposition on stoichiometry and thermoelectric properties of bismuth telluride films
Author(s) -
Diliberto S.,
Richoux V.,
Stein N.,
Boulanger C.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200779416
Subject(s) - bismuth telluride , stoichiometry , bismuth , materials science , thermoelectric effect , seebeck coefficient , electrical resistivity and conductivity , electrolyte , tellurium , chemical engineering , thermoelectric materials , analytical chemistry (journal) , metallurgy , chemistry , composite material , electrode , organic chemistry , thermal conductivity , physics , electrical engineering , thermodynamics , engineering
Bismuth telluride films were synthesized using pulsed electrodeposition. Synthesis of films from electrolytes with different [Bi]/[Te] ratios evidenced that an increase of bismuth concentration in the electrolyte leads to a decrease of the tellurium percentage in the film. A more important study with the ratio [Bi]/[Te] = 2 was carried out in order to correlate pulse parameters and film compositions. A crystallographic study underlined a variation of grains orientation following to the stoichiometry. The comparison of thermoelectric properties of pulsed and direct electrodeposited films showed that pulsed electrodeposition improves the morphology and decreases the electrical resistivity of films. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)