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Featured researches published by Ryo Kawajiri.


international electron devices meeting | 2011

Single-grain Si TFTs using spin-coated liquid-silicon

Jin Zhang; Ryoichi Ishihara; Hideyuki Tagagishi; Ryo Kawajiri; Tatsuya Shimoda; C.I.M. Beenakker

Liquid silicon offers us an opportunity of fabricating TFTs using printed silicon, instead of printed organic materials. We have fabricated single-grain Si TFTs on location-controlled Si grains with laser crystallization of a-Si formed from spin-coated liquid Si. Si grains with a maximum grain diameter of 3.5 µm were positioned at predetermined sites. Mobilities for electrons and holes are 391 cm2/Vs and 111 cm2/Vs, respectively.


Journal of Materials Chemistry C | 2016

Well-defined silicon patterns by imprinting of liquid silicon

Ryo Kawajiri; Hideyuki Takagishi; Takashi Masuda; Toshihiko Kaneda; Ken Yamazaki; Tadaoki Mitani; Tatsuya Shimoda

Well-defined silicon patterns with a high aspect ratio and sharp edges were directly formed by imprinting of liquid silicon which was synthesized via the photopolymerization of cyclopentasilane (CPS: Si5H10) with UV light. After the patterns were formed, they were converted into amorphous silicon patterns by post-annealing at 400 °C. Both dotted and lined patterns whose size ranges from 1 μm to 100 nm were obtained, suggesting that their size could be further reduced. It is very noteworthy that all the obtained patterns demonstrated a good aspect ratio and sharp edges, despite a large shrinkage of 70–80% during the process. By conducting solid-phase crystallization at 800 °C, the pattern portion was converted into polycrystalline pure silicon, whereas the residual film region remained in an amorphous state containing large amounts of oxygen and carbon atoms. Based on the experimental results, the relationship between the decomposition and solidification processes of liquid silicon and its imprinting behavior was clarified and the mechanism of impurity condensation in a residual film region at the annealing temperature of 800 °C and that of well-defined shape formation were discussed. The developed method can be expected to be used in the fabrication of micro-silicon devices because of its production simplicity.


Applied Physics Express | 2014

Formation of epitaxial cobalt disilicide thin film by solution processing

Ryo Kawajiri; Hideyuki Takagishi; Tadaoki Mitani; Tatsuya Shimoda

A precursor obtained by the reaction between cyclopentasilane and dicobaltoctacarbonyl in a toluene solution provides a method for the production of a low-resistivity thin film of cobalt disilicide CoSi2 (ca. 15 µΩ·cm) on a silicon (100) substrate by spin coating and annealing. Several types of analysis have revealed that the films formed on silicon substrates have a double-layer structure consisting of an upper layer (oxidized complex film) and an epitaxial CoSi2 layer with low resistivity along the (100) orientation of the silicon substrate. The former layer can be removed by dry etching or chemical mechanical planarization when used in actual applications.


Angewandte Chemie | 2005

Reverse spin transition triggered by a structural phase transition

Shinya Hayami; Yuji Shigeyoshi; Motoko Akita; Katsuya Inoue; Kenichi Kato; Keiichi Osaka; Masaki Takata; Ryo Kawajiri; Tadaoki Mitani; Yonezo Maeda


Journal of the American Chemical Society | 2005

A Mixed-Valence Coordination Polymer Featuring Two-Dimensional Ferroelectric Order: {[CuI4CuII(Et2dtc)2Cl3][CuII(Et2dtc)2]2(FeCl4)}n (Et2dtc- = diethyldithiocarbamate)

Takashi Okubo; Ryo Kawajiri; Tadaoki Mitani; Tatsuya Shimoda


Inorganic Chemistry | 2005

Spin-crossover cobalt(II) compound with banana-shaped structure

Shinya Hayami; Reiko Moriyama; Yuji Shigeyoshi; Ryo Kawajiri; Tadaoki Mitani; Motoko Akita; Katsuya Inoue; Yonezo Maeda


Bulletin of the Chemical Society of Japan | 2003

Study of intermolecular interaction for the spin-crossover iron(II) compounds

Shinya Hayami; Ryo Kawajiri; Gergely Juhász; Takayoshi Kawahara; Koichiro Hashiguchi; Osamu Sato; Katsuya Inoue; Yonezo Maeda


Polyhedron | 2006

Structural and magnetic studies on a new mixed-valence Cu(I)-Cu(II) octanuclear cluster with a dithiocarbamate derivative

Ryo Kawajiri; Takashi Okubo; Tadaoki Mitani


ECS Transactions, 50 (8), 2013 | 2013

Single-Grain Si TFTs Fabricated by Liquid-Si and Long-Pulse Excimer-Laser

Ryoichi Ishihara; Jin Zhang; Miki Trifunovic; M. Van der Zwan; Hideyuki Takagishi; Ryo Kawajiri; Tatsuya Shimoda; C.I.M. Beenakker


Chemistry Letters | 2006

Hysteresis Loops in Dielectric Properties of the Thermochromic Copper(II) Compounds

Shinya Hayami; Natsuko Motokawa; Aya Shuto; Naoji Masuhara; Yasuhiro Umebayashi; Yonezo Maeda; Osamu Sato; Katsuya Inoue; Ryo Kawajiri; Yui Kumura; Takashi Okubo; Tadaoki Mitani

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Tadaoki Mitani

Japan Advanced Institute of Science and Technology

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C.I.M. Beenakker

Delft University of Technology

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Ryoichi Ishihara

Delft University of Technology

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Jin Zhang

Delft University of Technology

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Miki Trifunovic

Delft University of Technology

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