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<p>This paper presents a novel self-powered ultraviolet light detector based on ZnO/CdS nanocomposites, which synthesized via a two-step hydrothermal method. By subjecting ZnO nanorod arrays and CdS precursor solutions to secondary hydrothermal treatment, a structurally well-defined ZnO/CdS nanorod p–n junction array was successfully constructed. XRD, SEM, UV–vis, etc. were employed to systematically investigate the phase structure, morphology, composition, and optical properties of the nanocomposites, as well as the photo response performance of the photo detector. CdS uniformly coats the ZnO nanorod surface, effectively suppressing the recombination of photo-generated electron–hole pairs within the ZnO and significantly reducing the response time. The built-in heterojunction enables the efficient separation of photogenerated carriers, resulting in enhanced device performance. The fabricated ultraviolet detector exhibits markedly improved performance attributable to these synergistic effects. With a bias of 0&#xa0;V, it achieves an I<sub>photo</sub>/I<sub>dark</sub> ratio of 171.7, with rise and fall times of 0.12&#xa0;s and 0.15&#xa0;s, a responsivity of 32.58&#xa0;mA/W, and an external quantum efficiency of 8.39% under 365&#xa0;nm UV irradiation.</p>

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A fast and highly responsive UV photodetector based on ZnO/CdS nanocomposites

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Shuaijie Li,
  • Junjie Zhang,
  • Teng Ma,
  • Zhikun Zhang,
  • Xinyu Yang,
  • Yuheng Luo,
  • Lili Zhang,
  • Baohua Zhang,
  • Fuqiang Guo,
  • Zhen Xu

摘要

This paper presents a novel self-powered ultraviolet light detector based on ZnO/CdS nanocomposites, which synthesized via a two-step hydrothermal method. By subjecting ZnO nanorod arrays and CdS precursor solutions to secondary hydrothermal treatment, a structurally well-defined ZnO/CdS nanorod p–n junction array was successfully constructed. XRD, SEM, UV–vis, etc. were employed to systematically investigate the phase structure, morphology, composition, and optical properties of the nanocomposites, as well as the photo response performance of the photo detector. CdS uniformly coats the ZnO nanorod surface, effectively suppressing the recombination of photo-generated electron–hole pairs within the ZnO and significantly reducing the response time. The built-in heterojunction enables the efficient separation of photogenerated carriers, resulting in enhanced device performance. The fabricated ultraviolet detector exhibits markedly improved performance attributable to these synergistic effects. With a bias of 0 V, it achieves an Iphoto/Idark ratio of 171.7, with rise and fall times of 0.12 s and 0.15 s, a responsivity of 32.58 mA/W, and an external quantum efficiency of 8.39% under 365 nm UV irradiation.