Journal
NANO LETTERS
Volume 10, Issue 10, Pages 3823-3827Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1010788
Keywords
Nanopillar photonics; light management. photovoltaics; light trapping; anti-reflectivity
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Funding
- BSAC
- NSF
- Lawrence Berkeley National Laboratory
- World Class University program at Sunchon National University
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Optical properties of highly ordered Ge nanopillar arrays are tuned through shape and geometry control to achieve the Optimal absorption efficiency Increasing the Ge materials filling ratio is shown to increase the reflectance while simultaneously decreasing the transmittance. with the absorbance showing a strong diameter dependency To enhance the broad band optical absorption efficiency. a novel dual-diameter nanopillar structure is presented, with a small diameter tip for minimal reflectance and a large diameter base for maximal effective absorption coefficient The enabled single-crystalline absorber material with a thickness of only 2 mu m exhibits an impressive absorbance of similar to 99% over wavelengths, lambda = 300-900 nm These results enable a viable and convenient route toward shape-controlled nanopillar-based high-performance photonic devices
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