Browsing by Author "Peng, Yu-Ming"

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Electron Emission Enhanced Properties of Gold Nanoparticle-Decorated ZnO Nanosheets Grown at Room Temperature
(2018-12-01)
Wang, Zi-Hao
;
Yang, Chih-Chiang
;
Yu, Hsin-Chieh
;
Peng, Yu-Ming
;
Su, Yan-Kuin
In this study, gold nanoparticles were adsorbed on glass nanosheets (NSs) grown on the surface of glass substrates with aqueous solutions at room temperature. The diameter and length of gold coater ZnO NSs are approximately 50 nm and 0.9 mu m, respectively. The Au-decorated ZnO NS grown at room temperature is structurally uniform and has a good orientation of the wurtzite structure. The turn-on electric fields of ZnO and Au-decorated ZnO nanosheets were 6.04 and 4.91 V/mu m, respectively. The field-enhancement factors were 2507 and 9298, respectively. Results showed that the Au-decorated ZnO NS has enhanced field-emission properties. In addition, due to the reduced size of the protruding Au nanoparticles, the number of emitting sites increases.
Electron Field Emission Enhancement Based on Al-Doped ZnO Nanorod Arrays With UV Exposure
(2018-01-01)
Wang, Zi-Hao
;
Yang, Chih-Chiang
;
Yu, Hsin-Chieh
;
Yeh, Hsin-Ting
;
Peng, Yu-Ming
In this paper, Al-doped ZnO nanorods (AZO NRs) were successfully applied on glass substrates through hydrothermal synthesis growth with a fabrication field-emission (FE) device. The enhanced FE properties of AZO NRs were measured. The turn-on fields were reduced by 2.35 and 1.51 V/mu m in the dark and under UV light, and the enhanced field enhancement factors (beta) were 5708 and 10137, respectively. Results show that the FE performances of AZO NRs were enhanced by the combined effect of increased carrier concentration and UV light illumination.
The Effect of Oxygen Vacancy Concentration on Indium Gallium Oxide Solar Blind Photodetector
(2018-05-01)
Chen, Kuan-Yu
;
Hsu, Ching-Chien
;
Yu, Hsin-Chieh
;
Peng, Yu-Ming
;
Yang, Chih-Chiang
In this paper, amorphous indium-gallium-oxide solar-blind metal-semiconductor-metal photodetectors were fabricated by using co-sputtering method. Three samples with different oxygen concentrations, namely, sample A without oxygen, sample B with 2% oxygen concentration, and sample C with 4% oxygen concentration, were investigated. The applied bias was 5 V during device characterization. The ultraviolet (UV)-to-visible rejection ratios were 39, 9.9 x 10(3), and 1.1 x 10(5) for samples A, B, and C, respectively. The dynamic responses of the decay times were 5.79/52.12 s, 1.96/30.49 s, and 0.02/0.75 s for samples A, B, and C, respectively. In summary, the 4% oxygen concentration sample exhibited excellent UV-to-visible rejection ratio and superior decay time.