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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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Filter-Free Image Sensor Pixels Comprising Silicon Nanowires with Selective Color Absorption

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Title
Filter-Free Image Sensor Pixels Comprising Silicon Nanowires with Selective Color Absorption
Author
Seo, KwanyongPark, HyunsunDan, YapingYu, Young J.Duane, Peter K.Wober, MunibCrozier, Kenneth B.
Keywords
Vertical silicon nanowire; photodetector; color imaging; image sensor; selective absorption
Issue Date
2014-04
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.14, no.4, pp.1804 - 1809
Abstract
The organic dye filters of conventional color image sensors achieve the red/green/blue response needed for color imaging, but have disadvantages related to durability, low absorption coefficient, and fabrication complexity. Here, we report a new paradigm for color imaging based on all-silicon nanowire devices and no filters. We fabricate pixels consisting of vertical silicon nanowires with integrated photodetectors, demonstrate that their spectral sensitivities are governed by nanowire radius, and perform color imaging. Our approach is conceptually different from filter-based methods, as absorbed light is converted to photocurrent, ultimately presenting the opportunity for very high photon efficiency.
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DOI
10.1021/nl404379w
ISSN
1530-6984
Appears in Collections:
ECHE_Journal Papers
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