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<p>In the present study, the electrodeposition technique was effectively employed to deposit cuprous oxide (Cu<sub>2</sub>O) thin films onto FTO glass substrates at various bath solution pH values (9,10 and 11)<b>.</b> X-ray diffraction (XRD) analysis revealed that the prepared films displayed a well-crystallized cubic structure with a predominant orientation along the (111) plane. The Scanning Electron Microscope (SEM) revealed that the surface morphology of the thin films changed from a coalesced structure to a four-sided pyramidal grain shape, accompanied by a variation in grain size as the pH of the solution increased. Raman spectroscopy confirmed the formation of Cu<sub>2</sub>O by identifying the Cu–O characteristic vibration mode. Optical absorption spectroscopy studies showed that among all the deposited thin films, the absorption edge of Cu<sub>2</sub>O film deposited at the solution pH 10 increased in visible region. Photoluminescence (PL) spectra exhibited an emission peak at 628&#xa0;nm, confirming the formation of Cu<sub>2</sub>O crystals. The band gap energy values were found to decrease from 2.39 to 2.28&#xa0;eV with increasing pH. The electrochemical analysis through Cyclic Voltammetry (CV) measurement showed that all deposited Cu<sub>2</sub>O thin films exhibit pronounced pseudocapacitive behavior, indicating their suitability for supercapacitor energy storage applications.</p>

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An influence of solution pH on improvement of structural, morphological, optical and electrochemical performance of Cu2O thin films for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • K. P. Ganesan,
  • K. Tamilarasan,
  • M. Muthukumar,
  • A. AmaliRoselin,
  • R. Ramesh,
  • S. Prabhu,
  • G. Gopu,
  • I. Joseph Panneerdoss,
  • G. Sivakumar,
  • N. Anandhan

摘要

In the present study, the electrodeposition technique was effectively employed to deposit cuprous oxide (Cu2O) thin films onto FTO glass substrates at various bath solution pH values (9,10 and 11). X-ray diffraction (XRD) analysis revealed that the prepared films displayed a well-crystallized cubic structure with a predominant orientation along the (111) plane. The Scanning Electron Microscope (SEM) revealed that the surface morphology of the thin films changed from a coalesced structure to a four-sided pyramidal grain shape, accompanied by a variation in grain size as the pH of the solution increased. Raman spectroscopy confirmed the formation of Cu2O by identifying the Cu–O characteristic vibration mode. Optical absorption spectroscopy studies showed that among all the deposited thin films, the absorption edge of Cu2O film deposited at the solution pH 10 increased in visible region. Photoluminescence (PL) spectra exhibited an emission peak at 628 nm, confirming the formation of Cu2O crystals. The band gap energy values were found to decrease from 2.39 to 2.28 eV with increasing pH. The electrochemical analysis through Cyclic Voltammetry (CV) measurement showed that all deposited Cu2O thin films exhibit pronounced pseudocapacitive behavior, indicating their suitability for supercapacitor energy storage applications.