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<p>This study reports a one-step paste-coated ZnO–PANI MSM photodetector decorated with Ag NPs via photodeposition. The undeposited device achieved a Responsivity of 1.40&#xa0;A/W, Detectivity of 3.51 × 10<sup>13</sup> Jones, and an EQE of 476% under 365&#xa0;nm illumination at 5&#xa0;V bias. FESEM and EDX reveal irregular ZnO platelets uniformly coated with PANI, with increasing Ag NP density and agglomeration as photodeposition duration increases. XRD indicates optimal ZnO crystallinity and minimal strain at 1&#xa0;min photodeposition. UV-Vis peak deconvolution showed secondary absorption broad peaks, possibly due to Ag NP agglomeration, in addition to the primary LSPR Ag peak. Despite plasmonic benefits extending into the sub-bandgap and NIR regions through Ag NP agglomeration, Ag photodeposition reduces UV detection performance due to dissolution of ZnO material during photodeposition. The undeposited device is optimal for high-sensitivity UV detection, with Ag photodeposition enabling tunable NIR enhancement for broadband photodetection.</p>

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Plasmonic tuning of ZnO-PANI paste photodetectors: Effect of aqueous Ag photodeposition duration on spectral responsivity

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Suvindraj Rajamanickam,
  • Khalid Hassan Ibnaouf,
  • Shawbo Abdulsamad Abubaker,
  • Bashayr Alanazi,
  • Naser M. Ahmed,
  • Hajo Idriss,
  • Munirah A. Almessiere,
  • Muna E. Raypah

摘要

This study reports a one-step paste-coated ZnO–PANI MSM photodetector decorated with Ag NPs via photodeposition. The undeposited device achieved a Responsivity of 1.40 A/W, Detectivity of 3.51 × 1013 Jones, and an EQE of 476% under 365 nm illumination at 5 V bias. FESEM and EDX reveal irregular ZnO platelets uniformly coated with PANI, with increasing Ag NP density and agglomeration as photodeposition duration increases. XRD indicates optimal ZnO crystallinity and minimal strain at 1 min photodeposition. UV-Vis peak deconvolution showed secondary absorption broad peaks, possibly due to Ag NP agglomeration, in addition to the primary LSPR Ag peak. Despite plasmonic benefits extending into the sub-bandgap and NIR regions through Ag NP agglomeration, Ag photodeposition reduces UV detection performance due to dissolution of ZnO material during photodeposition. The undeposited device is optimal for high-sensitivity UV detection, with Ag photodeposition enabling tunable NIR enhancement for broadband photodetection.