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Ko, Hyunhyub
Functional Nanomaterials & Devices Lab
Research Interests
  • Functional nanomaterials, flexible electronics, electronic skins, wearable sensors

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Black Ge Based on Crystalline/Amorphous Core/Shell Nanoneedle Arrays

Cited 42 times inthomson ciCited 46 times inthomson ci
Title
Black Ge Based on Crystalline/Amorphous Core/Shell Nanoneedle Arrays
Author
Chueh, Yu-LunFan, ZhiyongTakei, KuniharuKo, HyunhyubKapadia, RehanRathore, Asghar A.Miller, NateYu, KyoungsikWu, MingHaller, E. E.Javey, Ali
Keywords
Antireflective coating; Black germanium; Nanoneedles; Nanowires; Thin absorbers
Issue Date
2010-02
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.10, no.2, pp.520 - 523
Abstract
Direct growth of black Ge on low-temperature substrates, including plastics and rubber is reported. The material is based on highly dense, crystalline/amorphous core/shell Ge nanoneedle arrays with ultrasharp tips (̃4 nm) enabled by the Ni catalyzed vapor-solid-solid growth process. Ge nanoneedle arrays exhibit remarkable optical properties. Specifically, minimal optical reflectance (< 1 %) is observed, even for high angles of incidence (̃75°) and for relatively short nanoneedle lengths (̃1 μm). Furthermore, the material exhibits high optical absorption efficiency with an effective band gap of ̃1 eV. The reported black Ge could potentially have important practical implications for efficient photovoltaic and photodetector applications on nonconventional substrates.
URI
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DOI
10.1021/nl903366z
ISSN
1530-6984
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ECHE_Journal Papers
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