Kumar, Dinesh and Srivastava, Sanjay K. and Singh , P. K. and Sood, K. N. and Singh, V. N. and Dilawar , Nita and Husain, M. (2010) Room temperature growth of wafer-scale silicon nanowire arrays and their Raman characteristics. Journal of Nanoparticle Research , 12 (6). pp. 2267-2276. ISSN 1388-0764

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Abstract

We report a simple, inexpensive, and rapid process for large area growth of vertically aligned crystalline silicon nanowires (SiNWs) of diameter 40– 200 nm and variable length directly on p-type (100) silicon substrate. The process is based on Ag-induced selective etching of silicon wafers wherein the growth of SiNWs was carried out using the aqueous HF solution containing Ag? ions at room temperature in a Teflon vessel. Effect of etching time has been investigated to understand the evolution of SiNW arrays. It has been found that the length of SiNWs has a linear dependence on the etching time for small to moderate periods (0–2 h). However, etching rate decreases slowly for long etching times ([2 h). Scanning electron microscopy was used to study the morphology of the SiNW arrays. Structural and compositional analysis was carried out using Raman spectroscopy and high-resolution transmission electron microscopy equipped with energy dispersive X-ray spectroscopy. Orders of magnitude intensity enhancement along with a small downshift and broadening in the first-order Raman peak of SiNW arrays was observed in comparison to the bulk crystalline silicon.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Springer Verlag
Uncontrolled Keywords:	Silicon nanowires; Electroless etching; Silver catalyst; Raman spectroscopy; High-rate synthesis
Subjects:	Chemistry Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	06 Jul 2012 12:07
Last Modified:	06 Jul 2012 12:07
URI:	http://npl.csircentral.net/id/eprint/300

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