Feasibility Study for Double Luminescent Down-shifting Effect in A Dual Junction Solar Cell
Yu-Ming Huang1, Yu-Yun Cho1, Shun-Chieh Hsu1, Sheng-Feng Kao1, Hsiang-Yun Shih1, Ting-Yu Lee1, Yu-Cheng Kao2, Ray-Hua Horng2,3, Hao-Chung Kuo3, Chien-Chung Lin1
1National Chiao-Tung University, Tainan, Taiwan
/2National Chung Hsing University, Taichung, Taiwan
/3National Chiao Tang University, Hsinchu, Taiwan

    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.