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<p>A core–shell technique using ablation by laser in aqueous solutions is used to create Au@ Al<sub>2</sub>O<sub>3</sub> nanoparticles. Photoelectrochemical etching (PECE) from n-type silicon creates porous silicon. The deposition of Au@Al<sub>2</sub>O<sub>3</sub> nanostructures on the porus silicon substrate is characterized via scanning electron microscopy with field emission (FE-SEM), X-ray diffraction (XRD), and UV–visible (UV–vis) absorption physical measurements. XRD and UV–Vis spectroscopy confirm the formation of the core–shell structure in the nanoparticles, with XRD revealing that the Au and Al<sub>2</sub>O<sub>3</sub> structures are cubic and pointing in the direction of (111). The optical energy gap of Au@ Al<sub>2</sub>O<sub>3</sub> NPs decreases with increasing laser power. The fabricated Au@ Al<sub>2</sub>O<sub>3</sub> NPs/PS/n-Si photodetector shows responsivity (<i>R</i><sub><i>λ</i></sub>) of 0.084 A/W at laser power of 1000&#xa0;mJ, with a wide response range spanning from UV to IR. These findings are significant for advancing photoresponsivity and photovoltaic devices utilizing Au@ Al<sub>2</sub>O<sub>3</sub> core–shell nanoparticles and porous silicon.</p>

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Effect of Laser Energy on Formation of Gold@Aluminum Oxide (Core@Shell) Nanoparticles for Enhancement Spectral Responsivity

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Shireen A. Rasheed,
  • Uday M. Nayef

摘要

A core–shell technique using ablation by laser in aqueous solutions is used to create Au@ Al2O3 nanoparticles. Photoelectrochemical etching (PECE) from n-type silicon creates porous silicon. The deposition of Au@Al2O3 nanostructures on the porus silicon substrate is characterized via scanning electron microscopy with field emission (FE-SEM), X-ray diffraction (XRD), and UV–visible (UV–vis) absorption physical measurements. XRD and UV–Vis spectroscopy confirm the formation of the core–shell structure in the nanoparticles, with XRD revealing that the Au and Al2O3 structures are cubic and pointing in the direction of (111). The optical energy gap of Au@ Al2O3 NPs decreases with increasing laser power. The fabricated Au@ Al2O3 NPs/PS/n-Si photodetector shows responsivity (Rλ) of 0.084 A/W at laser power of 1000 mJ, with a wide response range spanning from UV to IR. These findings are significant for advancing photoresponsivity and photovoltaic devices utilizing Au@ Al2O3 core–shell nanoparticles and porous silicon.