Abstract
ZnO nanoparticle array has been fabricated on the Si substrate by a simple thermal chemical vapor transport and condensation without any metal catalysts. This ZnO nanoparticles array is constructed from ZnO quantum dots (QDs), and half-embedded in the amorphous silicon oxide layer on the surface of the Si substrate. The cathodoluminescence measurements showed that there is a pronounced blue-shift of luminescence comparable to those of the bulk counterpart, which is suggested to originate from ZnO QDs with small size where the quantum confinement effect can work well. The fabrication mechanism of the ZnO nanoparticle array constructed from ZnO QDs was proposed, in which the immiscible-like interaction between ZnO nuclei and Si surface play a key role in the ZnO QDs cluster formation. These investigations showed the fabricated nanostructure has potential applications in ultraviolet emitters.
Highlights
ZnO has attracted very great attention because of its particular properties in broad fields
When the size of ZnO nanoparticles is smaller than the Bohr radius (i.e., ZnO quantum dots, QDS), the quantum confinement has a notable influence on the band gap and further causes a series of novel characteristics such as the blueshift of luminescence [4,5,6,7]
Few research reports have been involved in the ZnO QDs, showing that their dimension is rigorously smaller than the Bohr radius [4,5,6,7,8,9,10,11,12,13]
Summary
ZnO has attracted very great attention because of its particular properties in broad fields. It has a large direct band gap of 3.37 eV and excitonbinding energy of 60 meV, while the Bohr radius of exciton is as small as approx. Zinc oxide powders and graphite powders are mixed and heated to 1050°C under the argon gas flow at the rate of 50 sccm with a pressure of 9.0 × 104 Pa. Half-an-hour later, the source powders and the substrate are all taken out from the furnace and allowed to cool down to room temperature naturally. Coupled to FESEM with the accelerating voltage of 10 kV
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