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<p>ZnO-based near-ultraviolet photodetectors (NUV PDs) are often limited by defect-induced carrier recombination. This work presents a novel, sustainable strategy by introducing a biomass-derived carbon quantum dot (COCQD) layer, synthesized from coconut juice, to enhance MgZnO nanorod (NR)-based PDs. For the first time, a fully non-vacuum fabricated device with a structure of Glass/FTO/ZnO/MgZnO NRs/COCQDs/C is demonstrated. Under 380&#xa0;nm illumination at zero bias, the COCQD-modified device achieves a responsivity of 0.206&#xa0;mA/W and a specific detectivity of 4.03 × 10<sup>8</sup> Jones, which represent significant enhancements of 29.6% and 15.5%, respectively, over the unmodified control. Concurrently, the noise-equivalent power is reduced to 7.02 × 10<sup>–10</sup> W. These improvements are attributed to two key mechanisms: effective passivation of surface defects by COCQDs to suppress dark current, and optimized interfacial band alignment for facilitated charge separation. This study provides a scalable, low-cost, and eco-friendly approach for high-performance NUV photodetectors.</p>

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Introducing coconut juice-derived carbon quantum dots for enhancing MgZnO near-UV photodetectors

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Xuan Ding,
  • Yitao Zhang,
  • Haoxiang Yin,
  • Xuan Yu,
  • Xiaoming Yu,
  • Zhenhua Li,
  • Hai Zhang,
  • Yingtang Zhou

摘要

ZnO-based near-ultraviolet photodetectors (NUV PDs) are often limited by defect-induced carrier recombination. This work presents a novel, sustainable strategy by introducing a biomass-derived carbon quantum dot (COCQD) layer, synthesized from coconut juice, to enhance MgZnO nanorod (NR)-based PDs. For the first time, a fully non-vacuum fabricated device with a structure of Glass/FTO/ZnO/MgZnO NRs/COCQDs/C is demonstrated. Under 380 nm illumination at zero bias, the COCQD-modified device achieves a responsivity of 0.206 mA/W and a specific detectivity of 4.03 × 108 Jones, which represent significant enhancements of 29.6% and 15.5%, respectively, over the unmodified control. Concurrently, the noise-equivalent power is reduced to 7.02 × 10–10 W. These improvements are attributed to two key mechanisms: effective passivation of surface defects by COCQDs to suppress dark current, and optimized interfacial band alignment for facilitated charge separation. This study provides a scalable, low-cost, and eco-friendly approach for high-performance NUV photodetectors.