Metamaterial-Plasmonic Absorber Structure for High Efficiency Amorphous Silicon Solar Cells
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- 作者：Yang Wang ; Tianyi Sun ; Trilochan Paudel ; Yi Zhang ; Zhifeng Ren ; Krzysztof Kempa
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：January 11, 2012
- 年：2012
- 卷：12
- 期：1
- 页码：440-445
- 全文大小：346K
- 年卷期：v.12,no.1(January 11, 2012)
- ISSN：1530-6992
文摘
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%.