Morphological, structural, and photoelectrochemical characterization of n-type Cu2O thin films obtained by electrodeposition

PAULA CAROLINA GREZ MORENO, Francisco Herrera, Gonzalo Riveros, Andrés Ramírez, Rodrigo Henríquez, Enrique Dalchiele, Ricardo Schrebler

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Thin films of copper(I) oxide (Cu2O) were electrodeposited on fluorine-doped tin oxide predeposited glass substrates, by reduction of Cu 2+ from Cu(II) acetate acid aqueous solutions. The Cu2O was potentiostatically grown at a potential value of -0.450V (vs. SMSE) at 70°C. The Cu2O thin films were characterized by means of scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), optical transmission, electrochemical impedance spectroscopy, and photoelectrochemical experiments. Through these techniques, it was possible to establish the cubic Cu2O phase with a high crystallinity and a strong preferential growth along the [200] and [220] directions. Cu2O thin films show oxygen vacancies with formation of a nonstoichiometric compound with the presence of Cu(0) in the crystal lattice as determined by XPS analysis. In addition, Cu2O was used as the photoanode for the I- oxidation reaction when the system was illuminated (Φ0=50. 0mWcm-2). The films exhibited a clear n-type semiconductor behavior, which was in agreement with the Mott-Schottky results. This behavior was explained by considering the nonstoichiometry of the oxide.

Original languageEnglish
Pages (from-to)2470-2475
Number of pages6
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume209
Issue number12
DOIs
StatePublished - Dec 2012
Externally publishedYes

Keywords

  • CuO
  • electrodeposition
  • photoelectrochemical properties
  • thin films

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