Browsing by Author "Cho, Yu-Yun"

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An Investigation on Stable and Continuous Operation of Hybrid Perovskite Quantum Dot Light Emitting Diodes
(2019-01-01)
Cho, Yu-Yun
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Hsu, Shun-Chieh
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Huang, Yu-Ming
;
Shih, Hsiang-Yun
;
Lee, Ting-Yu
Two different package structures of hybrid perovskite quantum dots light emitting diodes were demonstrated with stable and continuous light emission. With boron nitride nanoparticles, the lifetime of device is expected to be thousands of hours.
Feasibility Study for Double Luminescent Down-shifting Effect in A Dual Junction Solar Cell
(2019-01-01)
Huang, Yu-Ming
;
Cho, Yu-Yun
;
Hsu, Shun-Chieh
;
Kao, Sheng-Feng
;
Shih, Hsiang-Yun
In this work, we discuss the feasibility of two color photons for boosting up the short-circuit current and power conversion efficiency in tandem solar cell. One of them is by luminescent down-shifting (LDS) effect, and the other one is the infrared light emitting diode at 820nm. The CdZnSeS/ZnS quantum dots are used in this study. It can convert ultra-violet photons to visible ones which could be efficiently transformed into electron-hole pairs. The infrared-radiation LED can increase photo-generated carriers of the bottom GaAs solar cell. Finally, short-circuit current would significantly increase from 10.46 mA/cm(2) to 13.81 mA/cm(2), and power conversion efficiency increase from 19.89 to 25.22%. This result shows the possible double-LDS effect for solar cell enhancement in the future.
Simulation Model of Oxide-Aperture Strain Quantum Well VCSEL
(2019-01-01)
Shih, Hsiang-Yun
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Cho, Yu-Yun
;
Hsu, Shun-Chieh
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Huang, Yu-Ming
;
Wang, Shou-Wei
An oxide aperture strained quantum well VCSEL model was built based on measured results. The indium composition of MQW was changed to maximize the frequency response. The simulation result shows that the bandwidth can be improved and reach 30.88GHz.
The Aging Study for Fine Pitch Quantum-Dot Array on LEDs
(2019-01-01)
Huang, Yu-Ming
;
Liang, Kai-Ling
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Cho, Yu-Yun
;
Hsu, Shun-Chieh
;
Kuo, Wei-Hung
In this paper, we fabricated the photoresist mold whose pitch is smaller than 15. m on light-emitting diode and printed two different cadmium-based quantum dots. Also, we burn-in the LED to compare their lifetime which are pasted barrier film by two different methods. (C) 2019 The Author(s)
The Luminescent Down Shifting Effect of Single-Junction GaAs Solar Cell with Perovskite Quantum Dots
(2019-01-01)
Cho, Yu-Yun
;
Huang, Yu -Ming
;
Hsu, Shun-Chieh
;
Kao, Sheng-Feng
;
Shih, Hsiang-Yun
In this work, we demonstrate the Luminescent Down Shifting (LDS) effect of the single-junction GaAs solar cell with 514 nm Perovskite quantum dots with and without bake treatment. One of results shows that Jsc from 22.22 mA/cm(2) to 23.38 mA/cm(2) and the efficiency from 17.70% to 18.96% as high as 5.22% and 7.12% enhancement. The enhancement includes antireflection and LDS effect, via our calculated the increase J. from LDS effect was 31.65% Further storage lifetime test shows great reliability from these devices can be expected.