Electrochemical quartz crystal microbalance study of Si electrodeposition in ionic liquid

J. Komadina, T. Akiyoshi, Y. Ishibashi, Y. Fukunaka, Takayuki Homma

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    The electrodeposition of silicon from silicon tetrachloride in the hydrophobic room temperature ionic liquid trimethyl-n-hexyl ammonium bis-(trifluoromethylsulfonyl) imide was investigated by cyclic voltammetry and chronoamperometry. In situ electrochemical quartz crystal microbalance (EQCM) impedance spectroscopy was used to estimate the mass of films during deposition. The charge efficiency estimated from EQCM measurements is ∼190-250% for four-electron silicon reduction. However, compositional analysis by XPS shows that the EQCM current efficiency estimates are artificially high due to ionic liquid inclusion in the films. Taking the mass concentration of impurities into account, the best-case estimate of current efficiency is found to be approximately 130% for constant potential deposition, suggesting silicon may not have been completely reduced at the potentials investigated, or a chemical reaction step occurs. We also consider that the EQCM analysis may include too many deviations from assumptions for accurate estimation of mass with the conditions studied.

    Original languageEnglish
    Pages (from-to)236-241
    Number of pages6
    JournalElectrochimica Acta
    Volume100
    DOIs
    Publication statusPublished - 2013 Jun 30

    Fingerprint

    Ionic Liquids
    Quartz crystal microbalances
    Ionic liquids
    Electrodeposition
    Silicon
    Imides
    Chronoamperometry
    Ammonium Compounds
    Cyclic voltammetry
    Chemical reactions
    X ray photoelectron spectroscopy
    Spectroscopy
    Impurities
    Electrons
    Temperature

    Keywords

    • EQCM
    • Ionic liquid
    • Silicon electrodeposition

    ASJC Scopus subject areas

    • Electrochemistry
    • Chemical Engineering(all)

    Cite this

    Electrochemical quartz crystal microbalance study of Si electrodeposition in ionic liquid. / Komadina, J.; Akiyoshi, T.; Ishibashi, Y.; Fukunaka, Y.; Homma, Takayuki.

    In: Electrochimica Acta, Vol. 100, 30.06.2013, p. 236-241.

    Research output: Contribution to journalArticle

    Komadina, J. ; Akiyoshi, T. ; Ishibashi, Y. ; Fukunaka, Y. ; Homma, Takayuki. / Electrochemical quartz crystal microbalance study of Si electrodeposition in ionic liquid. In: Electrochimica Acta. 2013 ; Vol. 100. pp. 236-241.
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