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<p>Photodetectors are crucial optoelectronic devices that play a significant role in modern technological applications due to their unique photoresponsive properties. This study investigates the influence of molybdenum oxide (MoO<sub>3</sub>) doping on the structural, optical, and diode characteristics of nickel oxide (NiO) nanoparticles (NPs) synthesized via a simple co-precipitation method. The XRD pattern of pure NiO NPs exhibits a cubic phase, while all MoO<sub>3</sub>-doped NiO samples display dual crystal structures corresponding to cubic NiO and orthorhombic MoO<sub>3</sub>. The crystallite size decreases from 20 to 14&#xa0;nm with increasing MoO<sub>3</sub> concentration. FESEM images reveal a randomly oriented sheet-like surface morphology, and the EDX spectrum confirms the elemental composition of the MoO<sub>3</sub>-doped NiO NPs. TEM analysis further supports the sheet-like morphology and polycrystalline nature of the samples. The optical band gap energy decreases from 3.7 to 3.1&#xa0;eV upon MoO<sub>3</sub> incorporation. The PL spectrum exhibits three emission peaks at 414, 485, and 530&#xa0;nm. All fabricated diodes demonstrate a positive photoresponse under illuminated conditions. In particular, the p-MoO<sub>3</sub>@NiO/n-Si diode with 9-wt.% MoO<sub>3</sub> exhibits the highest responsivity (134.6&#xa0;mA·W<sup>-1</sup>), quantum efficiency (532.3%), and detectivity (10.3 × 10<sup>9</sup> Jones). These findings suggest that the p-MoO<sub>3</sub>@NiO/n-Si heterojunction diode is a promising candidate for next-generation optoelectronic applications.</p>

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The role of MoO3 doping in tuning the optical absorption, energy gap, and photoluminescence properties of NiO nanoparticles for photodetector applications

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • R. Marnadu,
  • S. Arunkumar,
  • S. Sugarthi,
  • Deepa Jananakumar,
  • S. AlFaify,
  • Mohd. Shkir,
  • Vasudeva Reddy Minnam Reddy

摘要

Photodetectors are crucial optoelectronic devices that play a significant role in modern technological applications due to their unique photoresponsive properties. This study investigates the influence of molybdenum oxide (MoO3) doping on the structural, optical, and diode characteristics of nickel oxide (NiO) nanoparticles (NPs) synthesized via a simple co-precipitation method. The XRD pattern of pure NiO NPs exhibits a cubic phase, while all MoO3-doped NiO samples display dual crystal structures corresponding to cubic NiO and orthorhombic MoO3. The crystallite size decreases from 20 to 14 nm with increasing MoO3 concentration. FESEM images reveal a randomly oriented sheet-like surface morphology, and the EDX spectrum confirms the elemental composition of the MoO3-doped NiO NPs. TEM analysis further supports the sheet-like morphology and polycrystalline nature of the samples. The optical band gap energy decreases from 3.7 to 3.1 eV upon MoO3 incorporation. The PL spectrum exhibits three emission peaks at 414, 485, and 530 nm. All fabricated diodes demonstrate a positive photoresponse under illuminated conditions. In particular, the p-MoO3@NiO/n-Si diode with 9-wt.% MoO3 exhibits the highest responsivity (134.6 mA·W-1), quantum efficiency (532.3%), and detectivity (10.3 × 109 Jones). These findings suggest that the p-MoO3@NiO/n-Si heterojunction diode is a promising candidate for next-generation optoelectronic applications.