ZnO is a promising material for optoelectronic devices because of its wide bandgap and large exciton binding energy.
However, majority of studies of ZnO nanostructures have been focusing on the study of their optical and structural
properties. For device applications of ZnO, other factors besides ZnO material quality also play a significant role. For
example, a typical ZnO nanorod based light emitting diode (LED) contains a polymer insulating layer and a top contact.
The device performance is dependent on the insulating layer and top contact quality. In this work, the effect of different
insulating polymers on the performance of p-GaN/n-ZnO LED was investigated. The structure of LED was: Au/ Ni/p-GaN/ZnO nanorods/insulating polymers/Ag. The ZnO nanorods were fabricated by hydrothermal method, and the length
of the nanorods was 250 nm. In this work, we investigated absorption spectra, electroluminescence (EL) properties, and
I-V curves to characterize the performance of the devices fabricated using spin-on glass (SOG), poly(vinylalcohol)
(PVA), polymethyl methacrylate (PMMA) and polystyrene (PS) as insulating layers. Finally, the comparison of the
performance of the devices with different polymers was discussed.
Zinc Oxide (ZnO) photonic crystals (PCs) are of great interest in recent years due to its potential applications in
optoelectronic devices. However, most of the growth temperatures in fabricating ZnO nanostructures in periodic
structures reported up to date are very high (>500°C), which is not favorable for low cost manufacture. In this work, a
method involving low growth temperature (90°C), hydrothermal synthesis, was used to fabricate ZnO nanostructures.
Self-assembly of polystyrene (PS) spheres was used to fabricate periodic arrays. PS spheres were self-assembled on the
silicon (Si) or fluorine-doped tin oxide (FTO) substrate with ZnO seed layer derived from zinc acetate. After crosslinking
the PS sphere layer, hydrothermal growth was performed. The influence of growth conditions (concentration, addition of
PEI, etc.) on fabricated ZnO nanorod array has been studied. Then, PS spheres were removed by annealing in air, and
fabricated ZnO nanorod arrays were studied by scanning electron microscopy (SEM) and photoluminescence (PL)
spectroscopy. Periodicity of the array was strongly substrate dependent (better on Si than on FTO). Light emitting diodes
were also fabricated in order to demonstrate the potential use of this ZnO periodic array.
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