Browsing by Author "Chu, Li Chen"

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Degradation of InGaN/GaN LEDs under Forward-bias Operations in Salty Water Vapor
(2016)
Chen, Hsiang
;
Hsieh, Kun Min
;
He, Yun Yang
;
Chu, Li Chen
;
Lee, Ming Ling
Forward-bias stress in salty water vapor can quickly degrade the InGaN/GaN LEDs. To examine the weakness of the device, electrical, optical, and material analyses and characterizations were performed to investigate the failure mechanism. Corrosion of the electrode and Au atom diffusion might result in damages of the device. Results indicate that forward-bias stress in salty water vapor can quickly influence the material properties, optical behaviors, and electrical characteristics of the LED device.
Fabrication and characterization of cobalt nanoparticles on ZnO nanorods on a polished titanium substrate
(2015-08-01)
Lee, Ming Ling
;
Chen, Hsiang
;
Chen, Chin Pang
;
Chu, Li Chen
;
Wang, Sheng Hsin
Cobalt (Co) nanoparticles (NPs) are spread on ZnO nanorods (NRs) on a polished Ti substrate. To characterize the Co NPs on the ZnO NRs, multiple material analyses including field-emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FIR) spectroscopy and secondary ion mass spectroscopy (SIMS) are carried out to examine the nanocomposite. Results indicate that Co NPs may accuthulate on the top part of ZnO NRs because of their sticky property. The CoNPs/ZnO NRs/Ti nanocomposite shows promise for future ferromagnetic device applications. (c) 2015 Elsevier Ltd. All rights reserved.