A spectrum-splitting and beam-concentrating (SSBC) diffractive optical element (DOE) for three-junction photovoltaics (PV) system is designed and fabricated by five-circle micro-fabrication. The incident solar light is efficiently split into three sub-spectrum ranges and strongly concentrated on the focal plane, which can be directly utilized by suitable spectrum-matching solar cells. The system concentration factor reaches 12x. Moreover, the designed wavelengths (450 nm, 550nm and 650 nm) are spatially distributed on the focal plane, in good agreement with the theoretical results. The average optical efficiency of all the cells over the three designed wavelengths is 60.07%. The SSBC DOE with a high concentration factor and a high optical efficiency provides a cost-effective approach to achieve higher PV conversion efficiencies.
1.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Key Lab Renewable Energy, Beijing 100190, Peoples R China 3.Beijing Key Lab New Energy Mat & Devices, Beijing 100190, Peoples R China 4.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 5.Chinese Acad Sci, Lab Opt Phys, Beijing 100190, Peoples R China 6.Capital Normal Univ, Dept Phys, Beijing 100048, Peoples R China 7.Minist Educ, Beijing Key Lab THz Spect & Imaging, Key Lab THz Optoelect, Beijing 100048, Peoples R China 8.Chinese Acad Sci, Inst Opt & Elect, State Key Lab Opt Technol Nanofabricat & Microeng, Chengdu 610209, Peoples R China
Lin, Dong-Feng,Quan, Bao-Gang,Zhang, Qiu-Lin,et al. Spectrum-Splitting Diffractive Optical Element of High Concentration Factor and High Optical Efficiency for Three-Junction Photovoltaics[J]. CHINESE PHYSICS LETTERS,2016,33(7).