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<p>The study describes the preparation of a photodetector device using gold nanoparticles (Au-NPs) fabricated via pulsed laser ablation in liquid, working together with a nanostructure silicon base produced through photoelectrochemical etching. The gold nanoparticle devices’ optical, structural, and electrical properties were analyzed based on varying laser power. X-ray diffraction (XRD) analysis revealed peaks corresponding to the cubic structure of gold, “indicating the formation of nanoparticles on porous silicon,” while scanning electron microscope (SEM) images showed spherical particle morphology. The gold nanoparticles demonstrated characteristic surface plasmon resonance peaks within the 500–580&#xa0;nm wavelength range, with enhanced absorption linked to increased laser power. Optical features indicated that the optical bandgaps of the Au-NPs, produced at laser energies of 400, 600, 800, and 1000&#xa0;mJ, were 1.82, 1.81, 1.78, and 1.77&#xa0;eV, respectively. The maximum responsivity achieved at 505&#xa0;nm was 0.086 A/W of the Au-NPs/PS device produced at 1000&#xa0;mJ.</p>

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Enhancing of Spectral Responsivity of Gold Nanoparticles via Laser Ablation Deposited on Porous Silicon

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Shireen A. Rasheed,
  • Uday M. Nayef

摘要

The study describes the preparation of a photodetector device using gold nanoparticles (Au-NPs) fabricated via pulsed laser ablation in liquid, working together with a nanostructure silicon base produced through photoelectrochemical etching. The gold nanoparticle devices’ optical, structural, and electrical properties were analyzed based on varying laser power. X-ray diffraction (XRD) analysis revealed peaks corresponding to the cubic structure of gold, “indicating the formation of nanoparticles on porous silicon,” while scanning electron microscope (SEM) images showed spherical particle morphology. The gold nanoparticles demonstrated characteristic surface plasmon resonance peaks within the 500–580 nm wavelength range, with enhanced absorption linked to increased laser power. Optical features indicated that the optical bandgaps of the Au-NPs, produced at laser energies of 400, 600, 800, and 1000 mJ, were 1.82, 1.81, 1.78, and 1.77 eV, respectively. The maximum responsivity achieved at 505 nm was 0.086 A/W of the Au-NPs/PS device produced at 1000 mJ.