Realizing high photovoltaic efficiency with parallel multijunction solar cells based on spectrum-splitting and -concentrating diffractive optical element*
Wang Jin-Zea),b),c), Huang Qing-Lia),b),c), Xu Xina),b),c), Quan Bao-Ganga),d), Luo Jian-Henga),b),c), Zhang Yane), Ye Jia-Shenge), Li Dong-Meia),b),c), Meng Qing-Boa),b),c)†, Yang Guo-Zhena),f)‡
       
(a) Scheme of special DOE which implements spectrum spliting and concentrating functions in the X direction. The Y direction is perpendicular to the paper and sunlight is shed along the Z direction. (b) Scheme of the parallel multijunction solar cells architecture with a DOE to split and concentrate sunlight in the X direction, and concentrate sunlight in the Y direction. Solar cells with increasing band gaps ( E g) are laterally placed along the X direction in sequence according to the spectrum distribution on the output plane ( P 2).