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<p>This study focuses on the development of a specialized photodetector capable of operating across three spectral regions: ultraviolet (UV), visible, and near-infrared (NIR). The primary objective was to enhance the characteristics of the photodetector while extending its detection capabilities by addressing various challenges. To achieve this, n-type metal oxide cerium dioxide (CeO<sub>2</sub>) thin films were deposited on porous silicon (100) substrate using pulsed laser deposition (PLD). The study systematically varied the pulse laser energies (600, 800, and 1000 mJ) to investigate their impact on the optical and structural properties of the resulting films. Porous silicon was produced through photoelectrochemical etching (PECE) for a duration of 25 min. Additionally, gold nanoparticles were synthesized via pulsed laser ablation in distilled water with a different laser energies (300–1000 mJ), laser energy of 300 mJ utilized as an outer layer above the ceria. The structural characteristics of the films were evaluated using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The results indicate that both the gold and ceria nanoparticles exhibit a cubic crystal structure, with optimum crystallinity observed in the films prepared at 1000 mJ. The optical properties of the photodetector were assessed through UV–Vis spectroscopy, Raman spectroscopy, and photoluminescence spectroscopy. CeO<sub>2</sub> NPs demonstrated their highest UV absorption at 345 nm in the film prepared at 1000 mJ, corresponding to a band gap of 3.17 eV. Photodetector properties measurements revealed a direct correlation between laser energy and both spectral responsivity and quantum efficiency, with notable increases observed as the laser energy escalated from 600 to 1000 mJ. The optimal spectral responsivity achieved was 0.30 in the near-infrared region, while the maximum quantum efficiency reached 51% within the same spectral range. These findings underscore the potential of the Au/CeO<sub>2</sub>/PS photodetector for enhanced performance across multiple spectral regions.</p>

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Two-Step Nanosecond Pulsed Laser Deposition–Assisted Synthesis of Gold/Cerium Oxide Nanocomposite for Enhanced Performance Photodetectors

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Ruwaida T. Shbeeb,
  • Falah A-H. Mutlak

摘要

This study focuses on the development of a specialized photodetector capable of operating across three spectral regions: ultraviolet (UV), visible, and near-infrared (NIR). The primary objective was to enhance the characteristics of the photodetector while extending its detection capabilities by addressing various challenges. To achieve this, n-type metal oxide cerium dioxide (CeO2) thin films were deposited on porous silicon (100) substrate using pulsed laser deposition (PLD). The study systematically varied the pulse laser energies (600, 800, and 1000 mJ) to investigate their impact on the optical and structural properties of the resulting films. Porous silicon was produced through photoelectrochemical etching (PECE) for a duration of 25 min. Additionally, gold nanoparticles were synthesized via pulsed laser ablation in distilled water with a different laser energies (300–1000 mJ), laser energy of 300 mJ utilized as an outer layer above the ceria. The structural characteristics of the films were evaluated using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The results indicate that both the gold and ceria nanoparticles exhibit a cubic crystal structure, with optimum crystallinity observed in the films prepared at 1000 mJ. The optical properties of the photodetector were assessed through UV–Vis spectroscopy, Raman spectroscopy, and photoluminescence spectroscopy. CeO2 NPs demonstrated their highest UV absorption at 345 nm in the film prepared at 1000 mJ, corresponding to a band gap of 3.17 eV. Photodetector properties measurements revealed a direct correlation between laser energy and both spectral responsivity and quantum efficiency, with notable increases observed as the laser energy escalated from 600 to 1000 mJ. The optimal spectral responsivity achieved was 0.30 in the near-infrared region, while the maximum quantum efficiency reached 51% within the same spectral range. These findings underscore the potential of the Au/CeO2/PS photodetector for enhanced performance across multiple spectral regions.