Abstract:
:Light trapping across a wide band of frequencies is important for applications such as solar cells and photodetectors. Here, we demonstrate a new approach to light management by forming whispering-gallery resonant modes inside a spherical nanoshell structure. The geometry of the structure gives rise to a low quality-factor, facilitating the coupling of light into the resonant modes and substantial enhancement of the light path in the active material, thus dramatically improving absorption. Using nanocrystalline silicon (nc-Si) as a model system, we observe broadband absorption enhancement across a large range of incident angles. The absorption of a single layer of 50-nm-thick spherical nanoshells is equivalent to a 1-μm-thick planar nc-Si film. This light-trapping structure could enable the manufacturing of high-throughput ultra-thin film absorbers in a variety of material systems that demand shorter deposition time, less material usage and transferability to flexible substrates.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Yao Y,Yao J,Narasimhan VK,Ruan Z,Xie C,Fan S,Cui Ydoi
10.1038/ncomms1664subject
Has Abstractpub_date
2012-02-07 00:00:00pages
664issn
2041-1723pii
ncomms1664journal_volume
3pub_type
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