Browsing by Author "Lo, Kuo-Chung"

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Morphology effect on field emission property of carbon nanotube emitters in triode structure
(2008)
Cheng, Hui-Wen
;
Yeh, Ta-Ching
;
Kuo, Yi-Ting
;
Li, Yiming
;
Lin, Chen-Chun
In this work, process variation on the field emission property of the fabricated field emission (FE) triode arrays with carbon nanotubes (CNTs) as the field emitters are explored. To fabricate the FE triode structure, nanoporous anodic aluminum oxide (AAO) thin layer was first prepared on the Si substrate, followed by the growth of vertically aligned carbon nanotubes in AAO pore channels by electron cyclotron resonance chemical vapor deposition. The SiO2 dielectric and Al gate electrode layers required for the triode structure were directly deposited on the CNTs. Reactive ion and wet etches were then used to open the FE area in the triode. We employ the finite difference time domain particle-in-cell method to calculate the structure FE properly, where the results are calibrated with the collected FE current of the fabricated samples. The FE current Of Structure is then examined with respect to different shape, random height and angle of the CNT emitters. For symmetric shapes, like circle and square, the emission beam has been more focusing than triangle and trapezoid. The electric field of random height of CNTs is stronger than that of random angle. It is implied that the vertical CNTs has better FE property. Having the symmetric shape and vertical CNTs in triode Structure benefits the FE sources for advanced flat display technologies.
Novel surface conduction electron emitter (SCE) nanogaps for field emission displays
(2008)
Tsai, Chih-Hao
;
Pan, Fu-Ming
;
Lo, Hsiang-Yu
;
Li, Yiming
;
Kuo, Yi-Ting
A novel nanometer scaled gap in palladium thin film strip was prepared by hydrogen absorption under high pressure conditions, and implemented in the fabrication of the surface conduction electron emitter (SCE) for flat panel display applications. The lattice constant increase in the Pd due to the phase transformation from the a-phase to the beta-phase after hydrogen absorption, a large compressive stress occurred to the Pd thin film. With a proper geometric arrangement of the Pd/Pt/Ti emitter electrode of the SCE structure, a single nanogap per SCE device was prepared. Finite element analysis was carried out to study the hydrostatic stress distribution in the thin film emitter structure after Pd hydrogenation, and thereby the optimized thickness of thin film electrodes of the emitter Was determined for the nanogap fabrication. The novel SCE emitter had an inclined protrusion structure on the cathode, which greatly enhance the local electrical field and improve electron beam focusing. The experimental measurement and theoretical analysis show that field emission properties of the novel SCE are superior to conventional SCE with the coplanar cathode.