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<p>This study presents the fabrication and characterization of enhanced performance broadband ultraviolet-C (UV-C) to visible photodetectors (PDs) utilizing plasmonic metal nanoparticles (NPs) to induce localized surface plasmon resonance (LSPR). Noble metal NPs, specifically silver (Ag), gold (Au), and bimetallic (Ag/Au) NPs, were prepared using the pulsed laser ablation in liquid (PLAL) technique. These NPs were subsequently decorated onto β-Gallium Oxide nanorods (β-Ga<sub>2</sub>O<sub>3</sub> NRs)/p-GaN/sapphire using the photo-deposition technique to form hybrid nanostructures. The study considers four device variations: Pt/β-Ga<sub>2</sub>O<sub>3</sub> NRs/Pt, Pt/Ag NPs/β-Ga<sub>2</sub>O<sub>3</sub> NRs/Pt, Pt/Au NPs/β-Ga<sub>2</sub>O<sub>3</sub> NRs/Pt, and Pt/(Ag/Au) NPs/β-Ga<sub>2</sub>O<sub>3</sub> NRs/Pt. Metal NPs incorporation facilitates the LSPR, which leads to enhanced device performance parameters such as, responsivity (R) of 8.71 × 10<sup><b>–</b>01</sup> AW<sup>−1</sup>, external quantum efficiency (EQE) of 415.40%, detectivity (D*) of 2.06 × 10<sup>09</sup> Jones, noise equivalent power (NEP) of 1.16 × 10<sup><b>–10</b></sup> W/Hz<sup>1/2</sup>, and sensitivity of 1961% under fixed wavelength of 260&#xa0;nm UV-C illumination at 15&#xa0;V.bias. Notably, the bimetallic Pt/(Ag/Au) NPs/β-Ga<sub>2</sub>O<sub>3</sub> NRs/Pt device exhibited the highest performance among all devices. These results confirm that the cost-effective bimetallic absorption layer significantly improves the performance of broadband UV-C to visible photodetector applications.</p>

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Enhanced performance broadband UV-C to visible photodetectors utilizing plasmonic metal nanoparticle-decorated β-Ga2O3 nanorods on p-GaN/sapphire

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Aijaz Ali Soomro,
  • Sabah M. Mohammad,
  • Naveed Afzal,
  • Mundzir Abdullah,
  • Muhammad Ramzan,
  • Yuganesini Naidu Siva Kumar,
  • Hameed Naseer,
  • M. A. Ahmad

摘要

This study presents the fabrication and characterization of enhanced performance broadband ultraviolet-C (UV-C) to visible photodetectors (PDs) utilizing plasmonic metal nanoparticles (NPs) to induce localized surface plasmon resonance (LSPR). Noble metal NPs, specifically silver (Ag), gold (Au), and bimetallic (Ag/Au) NPs, were prepared using the pulsed laser ablation in liquid (PLAL) technique. These NPs were subsequently decorated onto β-Gallium Oxide nanorods (β-Ga2O3 NRs)/p-GaN/sapphire using the photo-deposition technique to form hybrid nanostructures. The study considers four device variations: Pt/β-Ga2O3 NRs/Pt, Pt/Ag NPs/β-Ga2O3 NRs/Pt, Pt/Au NPs/β-Ga2O3 NRs/Pt, and Pt/(Ag/Au) NPs/β-Ga2O3 NRs/Pt. Metal NPs incorporation facilitates the LSPR, which leads to enhanced device performance parameters such as, responsivity (R) of 8.71 × 10–01 AW−1, external quantum efficiency (EQE) of 415.40%, detectivity (D*) of 2.06 × 1009 Jones, noise equivalent power (NEP) of 1.16 × 10–10 W/Hz1/2, and sensitivity of 1961% under fixed wavelength of 260 nm UV-C illumination at 15 V.bias. Notably, the bimetallic Pt/(Ag/Au) NPs/β-Ga2O3 NRs/Pt device exhibited the highest performance among all devices. These results confirm that the cost-effective bimetallic absorption layer significantly improves the performance of broadband UV-C to visible photodetector applications.