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Seo, Kwanyong
The SEO Group
Research Interests
  • Flexible solar cell, transparent solar cell, PV-battery hybrid system, hetero-junction solar cell

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Multicolored Vertical Silicon Nanowires

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Title
Multicolored Vertical Silicon Nanowires
Other Titles
Multicolored Vertical Silicon Nanowires
Author
Seo, KwanyongWober, MunibSteinvurzel, PaulSchonbrun, EthanDan, YapingEllenbogen, TalCrozier, Kenneth B.
Keywords
Vertical silicon nanowire; waveguiding; selective absorption; color filtering; photodetection
Issue Date
2011-04
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.11, no.4, pp.1851 - 1856
Abstract
We demonstrate that vertical silicon nanowires take on a surprising variety of colors covering the entire visible spectrum, in marked contrast to the gray color of bulk silicon. This effect is readily observable by bright field microscopy, or even to the naked eye. The reflection spectra of the nanowires each show a dip whose position depends on the nanowire radii. We compare the experimental data to the results of finite difference time domain simulations to elucidate the physical mechanisms behind the phenomena we observe. The nanowires are fabricated as arrays, but the vivid colors arise not from scattering or diffractive effects of the array, but from the guided mode properties of the individual nanowires. Each nanowire can thus define its own color, allowing for complex spatial patterning. We anticipate that the color filter effect we demonstrate could be employed in nanoscale image sensor devices
URI
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DOI
10.1021/nl200201b
ISSN
1530-6984
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ECHE_Journal Papers
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