4.6 Review

Review-Solution Electrochemical Process for Fabricating Metal Oxides and the Thermodynamic Design

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出版社

ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac371a

关键词

Electrodeposition; semiconductors; Energy Conversion; oxide semiconductor; Thermodynamics

资金

  1. Japan Society for the Promotion of Science (JSPS) [19H02810]
  2. Grants-in-Aid for Scientific Research [19H02810] Funding Source: KAKEN

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Electrochemical processes in aqueous solutions play a crucial role in the preparation of metals, alloys, composites, and metal oxides. Understanding soluble chemical species, potential-pH diagrams, and solubility curves is essential for designing effective electrochemical processes. Additionally, considerations of equilibrium electrode potentials, critical pH values, and dissolved chemical species are key factors in the design and optimization of these processes.
Electrochemical processes in aqueous solutions are widely used for preparation of metals, alloys, composites, metal oxides and compounds. For understanding and designing an electrochemical process, it is crucial to study its soluble chemical species, potential-pH diagram, and solubility curves drawn based on thermodynamics. In this review, equilibrium electrode potentials, critical pH values, and dissolved chemical species related to the oxidation-reduction, acid-base, and ligand-exchanging reactions, in addition to the calculation based on standard Gibbs free energy are first briefly mentioned. This is followed by the description of the change in equilibrium electrode potentials of metal and metal compounds as demonstrated in the electrochemical preparation of the Cu-In-Se precursor for the Cu(In,Ga)Se-2 solar cell application. Additionally, the advantages and usefulness of soluble chemical species, potential-pH diagram, and solubility curves are discussed, by giving examples of direct electrodepositions of metal oxides, the chemical introduction of impurities into ZnO enabling characteristic control, the chemical bath deposition process (CBD) for Zn(S,O,OH) buffer layer in Cu(In,Ga)Se-2 solar cell, and lastly, the design of the electrochemical process for fabricating CuO/Cu2O bilayers.

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