NDLI: Influence of inhomogeneous porosity on silicon nanowire Raman enhancement and leaky mode modulated photoluminescence

Content Provider	Royal Society of Chemistry (RSC)
Author	Ratchford, Daniel Yeom, Junghoon Pehrsson, Pehr. E. Long, James P.
Copyright Year	2015
Abstract	Metal-assisted chemical etching (MACE) offers an inexpensive, massively parallel fabrication process for producing silicon nanowires (SiNWs). These nanowires can possess a degree of porosity depending on etch conditions. Because the porosity is often spatially inhomogeneous, there is a need to better understand its nature if applications exploiting the porosity are to be pursued. Here, the resolution afforded by micro-Raman and micro-photoluminescence (PL) is used to elucidate the effects of porosity heterogeneity on the optical properties of individual SiNWs produced in large arrays with MACE, while also determining the spatial character of the heterogeneity. For highly porous SiNWs, there is a dramatic reduction in Raman signal and an increase in PL near the SiNW tips. PL spectra collected along the SiNW length exhibit peaks due to leaky mode resonances. Analysis of the PL resonance peaks, Raman spectrum line shape, SEM images, and EDS spectra indicate that the SiNWs possess both radial and axial heterogeneity wherein, from base to SiNW tip, the SiNWs comprise a shell of increasingly thick porous Si surrounding a tapering core of bulk Si. This work describes how structural porosity variation shapes SiNW optical properties, which will influence the design of new SiNW-based photonic devices and chemical/biological sensors.
Starting Page	4124
Ending Page	4133
Page Count	10
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	9
Journal	Nanoscale
DOI	10.1039/c4nr06329e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chemical milling MACE Massively parallel (computing) Leaky mode Raman Nanowire battery Porosity Raman spectroscopy
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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