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
Anomalous temperature dependencies of photoluminescence for visible‐light‐emitting porous Si
X. L. Zheng,Wei Wang,Hui Chen +2 more
TL;DR: In this article, the results from variable-temperature photoluminescence (PL) show anomalous temperature dependencies of the spectral characteristics: the emission intensity increases with decreasing temperature until reaching an intensity maximum at about 100-200 K, then it decreases at lower temperatures; the emission energy shift with temperature has no fixed trend and varies with sampling point.
Journal ArticleDOI
Modification of the physical and optical properties of the frustule of the diatom Coscinodiscus wailesii by nickel sulfate
TL;DR: In this article, the photonic properties of a diatom can be altered by growth with a metal pollutant, such as nickel sulfate in sea water, and the ability to modify the properties of the frustule shows that mechanisms exist for the alteration of existing structures in nature to optimize specific characteristics for exploitation in biotechnological applications.
Journal ArticleDOI
Effects of crystallite size distribution on the Raman-scattering profiles of silicon nanostructures
TL;DR: In this article, a phenomenological model is developed to obtain an analytical expression for the Raman spectral profile from semiconductor nanostructures having a Gaussian distribution in the crystallite sizes.
Journal ArticleDOI
Characterization of microporous Si by flow calorimetry: Comparison with a hydrophobic SiO2 molecular sieve
L. T. Canham,A. J. Groszek +1 more
TL;DR: In this article, the authors compared the pore size and hydrophobicity of freshly etched crystalline silicon structures compared with similar measurements on silicalite, a well-studied microporous form of silicon dioxide.
Journal ArticleDOI
A study of hydrogen detection with palladium modified porous silicon
TL;DR: In this paper, a palladium/porous silicon hydrogen sensor has been developed using for the first time the measurement of contact potential difference variations (CPD), which is shown to depend on the type of silicon substrate, the etching current density used for porous silicon preparation and subsequent oxidation.
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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