A. M. C. Ng

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Zinc oxide (ZnO) has been attractive for optoelectronics application due to its wide band gap (E<sub>g</sub>=3.37 eV) and large exciton binding energy (~60 meV) characteristics. However, p-type doping of ZnO is still controversial and problematic. Therefore, there is considerable interest in fabrication of n-ZnO/p-GaN heterojunction LEDs. In this work, we(More)
We optimized the emission efficiency from a microcavity OLEDs consisting of widely used organic materials, N,N'-di(naphthalene-1-yl)-N,N'-diphenylbenzidine (NPB) as a hole transport layer and tris (8-hydroxyquinoline) (Alq<sub>3</sub>) as emitting and electron transporting layer. LiF/Al was considered as a cathode, while metallic Ag anode was used.(More)
We conducted detailed investigations of laser-assisted debonding of GaN-based light emitting diodes (LEDs). The devices were grown by metalorganic chemical vapor deposition (MOCVD) on sapphire substrates. After laser debonding the devices were photo-electrochemically (PEC) etched for the roughening of the debonded surface. The dependence of the luminous(More)
Zinc oxide (ZnO) nanorods are of great interest due to their potential use in optoelectronic devices. Hydrothermal synthesis and electrodeposition are two very promising techniques for ZnO growth as they are simple and inexpensive and also involve low fabrication temperature, favoring the use of large area and/or flexible substrates. In this work, we(More)
Nanomaterials are of great interest for a variety of practical applications. To achieve improved performance of nanomaterial-based devices it is essential to understand and modify their surface properties. Here we present an investigation of properties of nanosurfaces of ZnO and TiO<sub>2</sub>, and discuss their applications in photovoltaics and(More)
We have investigated the use of different cerium precursors for fabrication of Ce:ZnO nanorods by electrodeposition. ZnO nanorods fabricated with different Ce precursors had similar morphology, but very different optical properties. The influence of annealing in oxygen at different temperatures on the optical properties of Ce:ZnO nanorods was also studied.
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