Realization of Vertical Silicon Nanowire Networks with an Ultra High Density Using a Top–Down Approach

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Abstract:

In this paper, we demonstrate the top–down fabrication of vertical silicon nanowires networks with an ultra high density (4 × 1010 cm−2), a yield of 100%, and a precise control of both diameter and location. Firstly, dense and well-defined networks of nanopillars have been patterned by e-beam lithography using a negative tone e-beam resist Hydrogen SylsesQuioxane (HSQ). A very high contrast has been obtained using a high acceleration voltage (100 kV), very small beam size at a current of 100 pA and a concentrated developer, 25% Tetramethylammonium Hydroxide. The patterns were transferred by reactive ion etching. Using chlorine based plasma chemistry and low pressure, etching anisotropy was guaranteed while avoiding the so-called 'grass effect'. This approach enabled the production of vertical silicon nanowires networks with a 20 nm diameter and a pitch of 30 nm. Lastly, the self-limited oxidation phenomenon in 1D structure has been used to perfectly control the shrinking of NWs and to obtain a Si surface free of defects induced by reactive ion etching. The silicon nanowires networks have been tapered by wet oxidation (850 °C) down to a diameter of 10 nm with a high aspect ratio 11.

Keywords: ELECTRON-BEAM LITHOGRAPHY; REACTIVE-ION-ETCHING (RIE); VERTICAL SILICON NANOWIRES; WET OXIDATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2841

Publication date: November 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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