Electrodeposition of Bi{sub 2}Te{sub 3} films

Journal Article · Wed Aug 10 04:00:00 EDT 1994 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.46850· OSTI ID:165428

Magri, P; Boulanger, C; Lecuire, J M ^[1]

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1. Laboratoire d`Electrochimie des Materiaux, URA CNRS 158 Ile du Saulcy, 5704, Metz (France)

The Bi{sub 2}Te{sub 3} and its derivative compounds are very interesting materials in the field of thermoelectric refrigeration at room temperature. An electrochemical deposition that is an alternative process of the standard synthesis is developed in our laboratory. The study of the reduction of Te{sup IV+} and Bi{sup III+} and their mixtures, in aqueous solvent, evidences the direct formation of near stoichiometric Bi{sub 2}Te{sub 3} compounds. The electrodeposition is performed according to the reaction: 2BiO{sup +}+3HTeO{sup +}{sub 2}+13H{sup +}+18e{sup {minus}}{r_arrow}Bi{sub 2}Te{sub 3}{down_arrow}+8H{sub 2}OThe synthesis is realized in an acid electrolyte (HNO{sub 3}1M), allowing the stability of Te{sup IV+} and Bi{sup III+} salts. The Bi/Te ratio in the electroformatted films is varying with the solution composition and the applied current density. The X-ray controls of all the compounds obtained by this method show only one product, with a good crystallinity. The patterns are consistent with the space group {ital R}-3{ital m} of Bi{sub 2}Te{sub 3}. However, it should be noted orientation effects. The films exhibit qualitative thermoelectric properties of as {ital n}-type semiconductor. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Sponsoring Organization: USDOE
• OSTI ID: 165428
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 316; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BISMUTH TELLURIDES
CARRIER MOBILITY
ELECTRIC CONDUCTIVITY
ELECTRODEPOSITION
HALL EFFECT
N-TYPE CONDUCTORS
TEMPERATURE DEPENDENCE
THERMOELECTRIC PROPERTIES
THERMOELECTRIC REFRIGERATORS
THIN FILMS
X-RAY SPECTROSCOPY