%A Wang Jin-Ze (王进泽), Ye Jia-Sheng (叶佳声), Huang Qing-Li (黄庆礼), Xu Xin (许信), Li Dong-Mei (李冬梅), Meng Qing-Bo (孟庆波), Yang Guo-Zhen (杨国桢) %T Design optimization of highly efficient spectrum-splitting and beam-concentrating diffractive optical element for lateral multijunction solar cells %0 Journal Article %D 2014 %J Chin. Phys. B %R 10.1088/1674-1056/23/4/044211 %P 44211-044211 %V 23 %N 4 %U {https://cpb.iphy.ac.cn/CN/abstract/article_116123.shtml} %8 2014-04-15 %X Two improved algorithms are proposed to extend a diffractive optical element (DOE) to work under the broad spectrum of sunlight. An optimum design has been found for the DOE, with a weighted average optical efficiency of about 6.8% better than that of the previous design. The optimization of designing high optical efficiency DOEs will pave the way for future designs of high-efficiency, low-cost lateral multijunction solar cells based on such a DOE.