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Author

Shoji Furukawa

Bio: Shoji Furukawa is an academic researcher from Kyushu Institute of Technology. The author has contributed to research in topics: Polysilane & Silane. The author has an hindex of 13, co-authored 60 publications receiving 1053 citations.


Papers
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TL;DR: The structural analysis showed that the materials consist of small crystalline silicon particles surrounded by hydrogen atoms, whose diameters are 20--30 A\r{}.
Abstract: We have succeeded in fabricating the mostly crystallized Si:H materials having a wide optical band gap of up to 2.4 eV by means of a reactive sputtering technique with a low substrate temperature of \ensuremath{\sim}100 K. The structural analysis showed that the materials consist of small crystalline silicon particles surrounded by hydrogen atoms, whose diameters are 20--30 A\r{}. The widening of the optical band gap can be explained by a three-dimensional quantum-well effect in the small particles.

400 citations

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TL;DR: In this paper, a planar magnetron-based sputtering technique was used to fabricate mostly crystallized Si:H with a wide optical band gap and visible photoluminescence at room temperature.
Abstract: The mostly crystallized Si:H having a wide optical band gap and showing a visible photoluminescence at room temperature, has been fabricated by means of a planar magnetron rf sputtering technique in hydrogen gas onto a low temperature (about 100 K) substrate. The materials consist of very small crystalline silicon particles (average diameters: 2–5 nm) surrounded by =SiH2 groups. The observed macroscopic physical properties are explained by the three-dimensional quantum size effects in the ultrafine silicon particles.

127 citations

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TL;DR: In this article, the conversion efficiency of the solar cell fabricated using the mixture of red cabbage and curcumin was about 0.6% (light source: halogen lamp), which was larger than the solar cells using one kind of dye.

114 citations

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TL;DR: In this paper, the structure of polydimethylsilane crystals has been determined by using X-ray diffraction measurements and a theoretical diffraction pattern, in which the primitive translation vector c correspinds to the period of a one-dimensional silicon backbone having an all-trans conformation.

37 citations


Cited by
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Journal ArticleDOI
TL;DR: 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.

7,393 citations

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TL;DR: In this paper, it was shown that Si microcrystallites were embedded in a Si oxide matrix for the sample which emitted the light, and the inverse relation between emission energy and the square of the crystallite size indicates that carrier confinement in the Si micro-crystallite causes this photoluminescence phenomenon.
Abstract: Visible photoluminescence was observed in ultrafine Si particles at room temperature. Transmission electron microscopy revealed that Si microcrystallites were embedded in a Si oxide matrix for the sample which emitted the light. The emission energy depended on crystallite size in the range from 2.8 to 5 nm. The inverse relation between emission energy and the square of the crystallite size indicates that carrier confinement in the Si microcrystallites causes this photoluminescence phenomenon.

793 citations

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TL;DR: The BOLS correlation mechanism has been initiated and intensively verified as discussed by the authors, which has enabled the tunability of a variety of properties of a nanosolid to be universally reconciled to the effect of bond order deficiency of atoms at sites surrounding defects or near the surface edges of the nano-material.

775 citations

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TL;DR: In this paper, the authors compared the luminescence and vibrational properties of anodically oxidized (porous) silicon and of chemically synthesized siloxene (Si 6 O 3 H 6 ) and its derivates.

738 citations

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TL;DR: The chiral architectures from macromolecular building blocks were discussed and the conformational dynamics of the helicity and their effect on the physical properties of the polymers and the induction of helicity in the polymer chain were elaborated.
Abstract: The chiral architectures from macromolecular building blocks were discussed. The conformational dynamics of the helicity and their effect on the (photo)physical properties of the polymers and the induction of helicity in the polymer chain were elaborated. The influence of kinetics on the macromolecular secondary structure and the use of multiple interactions in the hierarchical organization of macromolecules to well-defined supramolecular assemblied were also examined.

725 citations