Characterization,Cathodoluminescence, and Field‐Emission Properties of Morphology‐Tunable CdS Micro/Nanostructures |
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Authors: | Tianyou Zhai Xiaosheng Fang Yoshio Bando Benjamin Dierre Baodan Liu Haibo Zeng Xijin Xu Yang Huang Xiaoli Yuan Takashi Sekiguchi Dmitri Golberg |
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Affiliation: | 1. World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1‐1, Tsukuba, Ibaraki 305‐0044, (Japan);2. Advanced Electronic Materials Center 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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Keywords: | cadmium sulfide cathodoluminescence field emission microstructures nanostructures semiconductors |
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