期刊
NANO LETTERS
卷 12, 期 1, 页码 440-445出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl203763k
关键词
Solar cells; thin films; metamaterial; plasmonics; nanooptics
类别
资金
- NSFC [61106061]
- U.S. Department of Energy [DOE DE-FG02-00ER45805]
We show that a planar structure, consisting of an ultrathin semiconducting layer topped with a solid nanoscopically perforated metallic film and then a dielectric interference film, can highly absorb (superabsorb) electromagnetic radiation in the entire visible range, and thus can become a platform for high-efficiency solar cells. The perforated metallic film and the ultrathin absorber in this broadband superabsorber form a metamaterial effective film, which negatively refracts light in this broad frequency range. Our quantitative simulations confirm that the superabsorption bandwidth is maximized at the checkerboard pattern of the perforations. These simulations show also that the energy conversion efficiency of a single-junction amorphous silicon solar cell based on our optimized structure can exceed 12%.
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