Characterization, Cathodoluminescence and Field-Emission Properties of Morphology-Tunable CdS Micro/Nanostructures
Author(s)
Zhai, Tianyou
Fang, Xiaosheng
Xu, Xijin
Bando, Yoshio
Golberg, Dmitri
Griffith University Author(s)
Year published
2010
Metadata
Show full item recordAbstract
High-quality, uniform CdS one-dimensional (1D) micro/nanostructures with different morphologies, e.g. microrods, sub-microwires and nanotips, are fabricated through a facile and effective thermal evaporation process. Their structural, cathodoluminescence and field-emission (FE) properties are systematically investigated. Microrods and nanotips exhibit sharp near band edge (NBE) emission and broad deep level (DL) emission, whereas sub-microwires show only the DL emission. A significant decrease in a DL/NBE intensity ratio is observed along a tapered nanotip towards a smaller diameter part. This behavior is understood ...
View more >High-quality, uniform CdS one-dimensional (1D) micro/nanostructures with different morphologies, e.g. microrods, sub-microwires and nanotips, are fabricated through a facile and effective thermal evaporation process. Their structural, cathodoluminescence and field-emission (FE) properties are systematically investigated. Microrods and nanotips exhibit sharp near band edge (NBE) emission and broad deep level (DL) emission, whereas sub-microwires show only the DL emission. A significant decrease in a DL/NBE intensity ratio is observed along a tapered nanotip towards a smaller diameter part. This behavior is understood under consideration of defect concentrations in the nanotips, as analyzed with high-resolution transmission electron microscopy (HRTEM). Field-emission (FE) measurements show that the nanotips possess best FE characteristics with a relatively low turn-on field of 5.28 V/孍 and the highest field-enhancement factor of 4819 among all 1D CdS nanostructures reported to date. The field-enhancement factor, turn-on and threshold fields are discussed related to structure morphology and vacuum gap variations under emission.
View less >
View more >High-quality, uniform CdS one-dimensional (1D) micro/nanostructures with different morphologies, e.g. microrods, sub-microwires and nanotips, are fabricated through a facile and effective thermal evaporation process. Their structural, cathodoluminescence and field-emission (FE) properties are systematically investigated. Microrods and nanotips exhibit sharp near band edge (NBE) emission and broad deep level (DL) emission, whereas sub-microwires show only the DL emission. A significant decrease in a DL/NBE intensity ratio is observed along a tapered nanotip towards a smaller diameter part. This behavior is understood under consideration of defect concentrations in the nanotips, as analyzed with high-resolution transmission electron microscopy (HRTEM). Field-emission (FE) measurements show that the nanotips possess best FE characteristics with a relatively low turn-on field of 5.28 V/孍 and the highest field-enhancement factor of 4819 among all 1D CdS nanostructures reported to date. The field-enhancement factor, turn-on and threshold fields are discussed related to structure morphology and vacuum gap variations under emission.
View less >
Conference Title
2010 3rd International Nanoelectronics Conference
Subject
Condensed Matter Characterisation Technique Development