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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Horng, Ray-HuaSubject: search.filters.subject.GaAs

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Now showing 1 - 3 of 3
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    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.
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    The Analysis of Dual-Junction Tandem Solar Cells Enhanced by Surface Dispensed Quantum Dots
    (2018-09-01)
    Hsu, Shun-Chieh
    ;
    Huang, Yu-Ming
    ;
    Kao, Yu-Cheng
    ;
    Kuo, Hao-Chung
    ;
    Horng, Ray-Hua
    The luminescent down-shifting (LDS) effect of a colloidal quantum dot layer on a dual junction solar cell is explored and analyzed. A 5.47% enhancement of power conversion efficiency is recorded when green quantum dots are dispersed on device surface. The surface reflectance spectra before and after the quantum dot dispenses are necessary to decouple the different mechanisms between antireflective and LDS effects. A further deduction of formulation on the dual-junction device with antireflection and LDS effect is presented and as high as 44.6% of short-circuit current increase in the green quantum dot case can be attributed to the LDS effect according to our calculation.
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    Colloidal Quantum Dot Enhanced Dual-Junction Tandem Solar Cells
    (2016-01-01)
    Hsu, Shun-Chieh
    ;
    Kao, Yu-Cheng
    ;
    Han, Hau-Vei
    ;
    Kuo, Hao-Chung
    ;
    Horng, Ray-Hua
    In this work, we demonstrate the the enhancement of two type hybrid QD dual-junction solar cell. The green QD520 sample, shows better performance than blue QD450 sample in current density and power conversion efficiency. The enhancement of short-circuit current and power conversion efficiency for green QD450 sample are 4.43% and 3.77% and the blue QD520 samples are 9.44% and 5.78%. For short wavelength, the enhancement can mainly be attributed to the photon downshift effect and antireflection, for long wavelength, it only the antireflection effect.