Yu-Ming Huang, C. Lin, Yu-Yun Cho, S. Hsu, Sheng-Feng Kao, Hsiang-Yun Shih, Ting-Yu Lee, Y. Kao, R. Horng, H. Kuo
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Feasibility Study for Double Luminescent Down-shifting Effect in A Dual Junction Solar Cell
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/cm2 to 13.81 mA/cm2, 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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