Characterization, Cathodoluminescence, and Field-Emission Properties of Morphology-Tunable CdS Micro/Nanostructures

Authors

  • Tianyou Zhai,

    Corresponding author
    1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
    • World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan).
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  • Xiaosheng Fang,

    1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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  • Yoshio Bando,

    1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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  • Benjamin Dierre,

    1. Advanced Electronic Materials Center National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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  • Baodan Liu,

    1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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  • Haibo Zeng,

    1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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  • Xijin Xu,

    Corresponding author
    1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
    • World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan).
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  • Yang Huang,

    1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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  • Xiaoli Yuan,

    1. Advanced Electronic Materials Center National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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  • Takashi Sekiguchi,

    1. Advanced Electronic Materials Center National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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  • Dmitri Golberg

    1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, (Japan)
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Abstract

High-quality, uniform one-dimensional CdS micro/nanostructures with different morphologies—microrods, sub-microwires and nanotips—are fabricated through an easy and effective thermal evaporation process. Their structural, cathodoluminescence and field-emission properties are systematically investigated. Microrods and nanotips exhibit sharp near-band-edge emission and broad deep-level emission, whereas sub-microwires show only the deep-level emission. A significant decrease in a deep-level/near-band-edge intensity ratio is observed along a tapered nanotip towards a smaller diameter part. This behavior is understood by consideration of defect concentrations in the nanotips, as analyzed with high-resolution transmission electron microscopy. Field-emission measurements show that the nanotips possess the best field-emission characteristics among all 1D CdS nanostructures reported to date, with a relatively low turn-on field of 5.28 V µm−1 and the highest field-enhancement factor of 4 819. The field-enhancement factor, turn-on and threshold fields are discussed related to structure morphology and vacuum gap variations under emission.

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