Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4871584
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Funding
- National Natural Science Foundation of China [11274344, 61036004]
- Hundred Talents Program of Chinese Academy of Sciences
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Fundamental Research Project of Shenzhen Science and Technology Foundation [JC201105180781A]
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The incorporation of plasmonic nanostructures in the thin-film solar cells (TFSCs) is a promising route to harvest light into the nanoscale active layer. However, the light trapping scheme based on the plasmonic effects intrinsically presents narrow-band resonant enhancement of light absorption. Here we demonstrate that by cascading metal nanogratings with different sizes atop the TFSCs, broadband absorption enhancement can be realized by simultaneously exciting multiple localized surface plasmon resonances and inducing strong coupling between the plasmonic modes and photonic modes. As a proof of concept, we demonstrate of 66.5% in the photocurrent in an ultrathin amorphous silicon TFSC with two-dimensional cascaded gratings over the reference cell without gratings. (C) 2014 AIP Publishing LLC.
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