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<p>The charge separation ability of zinc oxide (ZnO)-fullerene (C<sub>60</sub>) quantum dots (QDs) was analyzed and ultraviolet photodetectors were fabricated using spin-coating methods. The structural properties of the ZnO-C<sub>60</sub> core–shell QDs and poly-<i>N</i>-vinylcarbazole (PVK) polymer composites were analyzed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Optical characterization studies revealed that the ZnO-C<sub>60</sub> core–shell QDs exhibit a higher quenching effect ratio (97.72%) in the ultraviolet region and higher Förster resonance energy transfer efficiency (89%) from direct conjugation with the ZnO core to the C<sub>60</sub> shell. The photodetectors based on ZnO-C<sub>60</sub> core–shell QDs generated photocurrent of 4.92 μA under an external bias of 1&#xa0;V at a wavelength of 365, and the photo-responsivity was 1.51&#xa0;A/W. The photo-reaction mechanism is explained through energy diagrams based on experimental results.</p>

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Fast Charge Separation by Direct Combination of Fullerene C60 with ZnO Quantum Dots and its Application in Ultraviolet Photodetectors

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Jinseo Park,
  • Jaeho Shim,
  • Dong Ick Son

摘要

The charge separation ability of zinc oxide (ZnO)-fullerene (C60) quantum dots (QDs) was analyzed and ultraviolet photodetectors were fabricated using spin-coating methods. The structural properties of the ZnO-C60 core–shell QDs and poly-N-vinylcarbazole (PVK) polymer composites were analyzed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Optical characterization studies revealed that the ZnO-C60 core–shell QDs exhibit a higher quenching effect ratio (97.72%) in the ultraviolet region and higher Förster resonance energy transfer efficiency (89%) from direct conjugation with the ZnO core to the C60 shell. The photodetectors based on ZnO-C60 core–shell QDs generated photocurrent of 4.92 μA under an external bias of 1 V at a wavelength of 365, and the photo-responsivity was 1.51 A/W. The photo-reaction mechanism is explained through energy diagrams based on experimental results.