Journal ArticleDOI
Silicon quantum wire array fabrication by electrochemical and chemical dissolution of wafers
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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
Microstructure and optical absorption properties of si nanocrystals fabricated with low-pressure chemical-vapor deposition
TL;DR: In this paper, a simple technique for fabricating a layer of isolated Si quantum dots on SiO2 glass substrates is described, which uses conventional low pressure chemical-vapor deposition for an extremely short deposition time in the early stage of poly-Si film growth.
Journal ArticleDOI
Blue-green and red photoluminescence in CaTiO3 : Sm
Alberthmeiry T. de Figueiredo,Valeria M. Longo,Sérgio Ricardo Lázaro,Valmor Roberto Mastelaro,Fábio Simões de Vicente,Antônio Carlos Hernandes,Máximo Siu Li,José Arana Varela,Elson Longo +8 more
TL;DR: In this article, blue-green and red photoluminescence (PL) emission in structurally disordered CaTiO3:Sm (CT:Sm) powders was observed at room temperature with laser excitation at 350.7 nm.
Journal ArticleDOI
Photovoltaic properties of a novel stain etched porous silicon and its application in photosensitive devices
TL;DR: In this article, the decay dynamics of stain etched and electroless metal-deposited PV devices have been characterized in the dark and under room light (RL), and the PV decay times are observed to be of the order of microseconds, and vary with etch duration as well as with the details of the EMD.
Journal ArticleDOI
Raman scattering from very thin Si layers of Si/SiO2 superlattices: Experimental evidence of structural modification in the 0.8–3.5 nm thickness region
TL;DR: In this paper, a Raman spectra of very thin (⩽3.5 nm) Si layers constituting Si/SiO2 superlattices and grown by molecular beam epitaxy is described.
Journal ArticleDOI
Influence of surface states on the photoluminescence from silicon nanostructures
Md. N. Islam,Satyendra Kumar +1 more
TL;DR: In this paper, a phenomenological model was proposed to analyze the room temperature photoluminescence (PL) spectra observed from silicon nanostructures and incorporated the effects of localized surface states along with quantum confinement effects.
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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