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<p>This study investigates the fabrication of CuO and Cu<sub>2</sub>O nanostructures by a simple solution-based method followed by thermal annealing. Pure CuO was obtained at 180&#xa0;°C, while higher temperatures yielded Cu<sub>2</sub>O/CuO heterostructures. The pure CuO film exhibited the highest photocurrent density (140.05&#xa0;mA/cm<sup>2</sup>) and a notable dark current density (60.27&#xa0;mA/cm<sup>2</sup>). Although the heterostructures showed lower photocurrents, they also demonstrated significant dark currents (9.03–16.27&#xa0;mA/cm<sup>2</sup>) across different annealing temperatures. These findings suggest a promising approach for developing effective CuO-based photoelectrodes with both excellent photocatalytic capabilities and a potential for dark current generation.</p> Graphical abstract <p></p>

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CuO and Cu2O nanostructures: pathway to efficient dark current density

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • Leila Amiour,
  • Youcef Aouabdia,
  • Nadjah Sobti

摘要

This study investigates the fabrication of CuO and Cu2O nanostructures by a simple solution-based method followed by thermal annealing. Pure CuO was obtained at 180 °C, while higher temperatures yielded Cu2O/CuO heterostructures. The pure CuO film exhibited the highest photocurrent density (140.05 mA/cm2) and a notable dark current density (60.27 mA/cm2). Although the heterostructures showed lower photocurrents, they also demonstrated significant dark currents (9.03–16.27 mA/cm2) across different annealing temperatures. These findings suggest a promising approach for developing effective CuO-based photoelectrodes with both excellent photocatalytic capabilities and a potential for dark current generation.

Graphical abstract