Journal ArticleDOI
Silicon quantum wire array fabrication by electrochemical and chemical dissolution of wafers
TLDR
In this paper, free standing Si quantum wires can be fabricated without the use of epitaxial deposition or lithography using electrochemical and chemical dissolution steps to define networks of isolated wires out of bulk wafers.Abstract:
Indirect evidence is presented that free‐standing Si quantum wires can be fabricated without the use of epitaxial deposition or lithography. The novel approach uses electrochemical and chemical dissolution steps to define networks of isolated wires out of bulk wafers. Mesoporous Si layers of high porosity exhibit visible (red) photoluminescence at room temperature, observable with the naked eye under <1 mW unfocused (<0.1 W cm−2) green or blue laser line excitation. This is attributed to dramatic two‐dimensional quantum size effects which can produce emission far above the band gap of bulk crystalline Si.read more
Citations
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Journal ArticleDOI
Detection of luminescent single ultrasmall silicon nanoparticles using fluctuation correlation spectroscopy
Osman Akcakir,Joel Therrien,G. Belomoin,Nicholas P. Barry,Joachim D. Müller,Enrico Gratton,Munir H. Nayfeh +6 more
TL;DR: In this paper, a colloid of ultrasmall blue luminescent nanoparticles, observable with the naked eye, in room light was detected using two-photon near-infrared femtosecond excitation at 780 nm.
Journal ArticleDOI
Evidence of energy coupling between Si nanocrystals and Er3+ in ion-implanted silica thin films
TL;DR: In this article, Si nanocrystals and Er3+ were prepared by ion implantation, and excess Si concentrations ranged from 5% to 15%; Er 3+ concentration for all samples was 0.5%.
Journal ArticleDOI
Amine-terminated silicon nanoparticles: synthesis, optical properties and their use in bioimaging
Milena Rosso-Vasic,Evan Spruijt,Zoran B. Popović,K. Overgaag,Barend van Lagen,Bruno Grandidier,Daniel Vanmaekelbergh,David Domínguez-Gutiérrez,Luisa De Cola,Han Zuilhof +9 more
TL;DR: Very stable and bright emitting amine-terminated Si nanoparticles (NPs) with different alkyl chain lengths between the Si core and amine end-group are synthesized in this article.
Journal ArticleDOI
Evidence that blue luminescence of oxidized porous silicon originates from SiO2
A. J. Kontkiewicz,A. M. Kontkiewicz,J. Siejka,S. Sen,Grzegorz Nowak,Andrew M. Hoff,P. Sakthivel,K. Ahmed,Pritish Mukherjee,Sarath Witanachchi,Jacek Lagowski +10 more
TL;DR: In this article, the authors analyzed red and blue luminescence from porous silicon as a function of oxidation parameters and feature dimension determined with an atomic force microscope and found correlation between blue luminecence intensity and the increase in feature size caused by oxidation.
Journal ArticleDOI
Optical absorption evidence of a quantum size effect in porous silicon
TL;DR: In this article, optical transmission measurements performed on free-standing homogeneous porous silicon (PS) films of different porosities and substrate doping levels are presented, and the absorption coefficient curves deduced from these measurements, taking into account the total quantity of matter in the PS film, exhibit significant blue shift.
References
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Journal ArticleDOI
Electrolytic shaping of germanium and silicon
TL;DR: In this article, the properties of electrolyte-semiconductor barriers are described, with emphasis on germanium, and the use of these barriers in localizing electrolytic etching is discussed.
Journal ArticleDOI
Unusually low surface-recombination velocity on silicon and germanium surfaces.
TL;DR: It is found that a standard, widespread, chemical-preparation method for silicon, oxidation followed by an HF etch, results in a surface which from an electronic point of view is remarkably inactive, which has implications for the ultimate efficiency of silicon solar cells.
Journal ArticleDOI
Infrared spectroscopy of Si(111) and Si(100) surfaces after HF treatment: Hydrogen termination and surface morphology
TL;DR: In this paper, multiple internal infrared reflection spectroscopy has been used to identify the chemical nature of chemically oxidized and subsequently HF stripped silicon surfaces, and these very inert surfaces are found to be almost completely covered by atomic hydrogen.
Journal ArticleDOI
Hydrogen desorption kinetics from monohydride and dihydride species on silicon surfaces.
TL;DR: In this article, the authors measured hydrogen desorption from monohydride and dihydride species on crystalline-silicon surfaces using transmission Fourier-transform infrared (FTIR) spectroscopy.
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