研究者詳細 - 山下　善文

論文 - 山下　善文

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Expansion of Shockley stacking fault observed by scanning electron microscope and partial dislocation motion in 4H-SiC 査読

Yoshifumi Yamashita, Ryu Nakata, Takeshi Nishikawa, Masaki Hada, and Yasuhiko Hayashi

Journal of Applied Physics 123 ( 16 ) 161580-1 - 161580-5 2018年4月

Dislocation motion in Sb-doped SiGe on Si substrate 招待査読

Yoshifumi Yamashita, Takuya Matsunaga, Toru Funaki, Tatsuya Fushimi, and Yoichi Kamiura

Physica Status Solidi A 209 ( 10 ) 1921 - 1925 2012年10月

Highly Oriented Carbon Nanotube Supercapacitors 査読

Kohei Komatsubara, Hiroo Suzuki, Hirotaka Inoue, Misaki Kishibuchi, Shona Takahashi, Tatsuki Marui, Shigeyuki Umezawa, Tomohiro Nakagawa, Kyohei Nasu, Mitsuaki Maetani, Yuichiro Tanaka, Miyato Yamada, Takeshi Nishikawa, Yoshifumi Yamashita, Masaki Hada, Yasuhiko Hayashi

ACS Applied Nano Materials 5 ( 1 ) 1521 - 1532 2022年1月

A mechanistic investigation of moisture-induced degradation of methylammonium lead iodide 査読

Applied Physics Letters 117 ( 25 ) 253304 - 253304 2020年12月

Phonon transport probed at carbon nanotube yarn/sheet boundaries by ultrafast structural dynamics 査読

Masaki Hada, Kotaro Makino, Hirotaka Inoue, Taisuke Hasegawa, Hideki Masuda, Hiroo Suzuki, Keiichi Shirasu, Tomohiro Nakagawa, Toshio Seki, Jiro Matsuo, Takeshi Nishikawa, Yoshifumi Yamashita, Shin ya Koshihara, Vlad Stolojan, S. Ravi, P. Silva, Jun ichi Fujita, Yasuhiko Hayashi, Satoshi Maeda, Muneaki Hase

Carbon 170 165 - 173 2020年12月

Controlling Electronic States of Few-walled Carbon Nanotube Yarn via Joule-annealing and p-type Doping Towards Large Thermoelectric Power Factor 査読

May Thu, Zar Myint, Takeshi Nishikawa, Kazuki Omoto, Hirotaka Inoue, Yoshifumi Yamashita, Aung Ko Ko Kyaw, Yasuhiko Hayashi

Scientific Reports 10 ( 1 ) 7307-1 - 7307-9 2020年4月

Liquid-like dielectric response is an origin of long polaron lifetime exceeding 10 μs in lead bromide perovskites 査読

Kiyoshi Miyata, Ryota Nagaoka, Masaki Hada, Takanori Tanaka, Ryuji Mishima, Taihei Kuroda, Sota Sueta, Takumi Iida, Yoshifumi Yamashita, Takeshi Nishikawa, Kenji Tsuruta, Yasuhiko Hayashi, Ken Onda, Toshihiko Kiwa, Takashi Teranishi

The Journal of Chemical Physics 152 ( 8 ) 084704-1 - 084704-8 2020年2月

The critical role of the forest morphology for dry drawability of few-walled carbon nanotubes 査読

Hirotaka Inoue, Masaki Hada, Tomohiro Nakagawa, Tatsuki Marui, Takeshi Nishikawa, Yoshifumi Yamashita, Yoku Inoue, Kazuhiko Takahashi, Yasuhiko Hayashi

Carbon 158 662 - 671 2020年2月

One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface 査読

Hada, Masaki, Hada, Masaki, Hasegawa, Taisuke, Hasegawa, Taisuke, Inoue, Hirotaka, Inoue, Hirotaka, Takagi, Makito, Takagi, Makito, Omoto, Kazuki, Omoto, Kazuki, Chujo, Daiki, Chujo, Daiki, Iemoto, Shogo, Iemoto, Shogo, Kuroda, Taihei, Kuroda, Taihei, Morimoto, Taiga, Morimoto, Taiga, Hayashi, Takuma, Hayashi, Takuma, Iijima, Toru, Iijima, Toru, Tokunaga, Tomoharu, Tokunaga, Tomoharu, Ikeda, Naoshi, Ikeda, Naoshi, Fujimori, Kazuhiro, Fujimori, Kazuhiro, Itoh, Chihiro, Itoh, Chihiro, Nishikawa, Takeshi, Nishikawa, Takeshi, Yamashita, Yoshifumi, Yamashita, Yoshifumi, Kiwa, Toshihiko, Kiwa, Toshihiko, Koshihara, Shin-ya, Koshihara, Shin-ya, Maeda, Satoshi, Maeda, Satoshi, Hayashi, Yasuhiko, Hayashi, Yasuhiko

ACS Applied Energy Materials 2 ( 10 ) 7700 - 7708 2019年

Reverse-bias effects of metal-related levels in mc-Si for solar cells studied by isothermal DLTS

Kiichiro Tagawa, Yuta Miyabe, Keishi Yasuda, Yoshifumi Yamashita, Takeshi Nishikawa, Masaki Hada, Yasuhiko Hayashi

Proceedings of The Forum on the Science and Technology of Silicon Materials 2018 300 - 306 2018年11月

Effects of remote hydrogen-plasma treatment on electrical properties of beta-Ga2O3

Nobuchika Nagai, Toshiki Tanaka, Yoshifumi Yamashita, Masaki Hada, Takeshi Nishikawa, Yasuhiko Hayashi

Proceedings of The Forum on the Science and Technology of Silicon Materials 2018 387 - 391 2018年11月

Bond Dissociation Triggering Molecular Disorder in Amorphous H2O 査読

M. Hada, Y. Shigeeda, S. Koshihara, T. Nishikawa, Y. Yamashita, Y. Hayashi

Journal of Physical Chemistry A 122 9579 - 9584 2018年11月

High-performance structure of a coil-shaped soft-actuator consisting of polymer threads and carbon nanotube yarns 査読

Hirotaka Inoue, Takayuki Yoshiyama, Masaki Hada, Daiki Chujo, Yoshitaka Saito, Takeshi Nishikawa,Yoshifumi Yamashita, Wataru Takarada, Hidetoshi Matsumoto, and Yasuhiko Hayashi

AIP Advances 8 ( 7 ) 075316-1 - 075316-7 2018年7月

High-performance structure of a coil-shaped soft-actuator consisting of polymer threads and carbon nanotube yarns 査読

Hirotaka Inoue, Takayuki Yoshiyama, Masaki Hada, Daiki Chujo, Yoshitaka Saito, Takeshi Nishikawa, Yoshifumi Yamashita, Wataru Takarada, Hidetoshi Matsumoto, Yasuhiko Hayashi

AIP ADVANCES 8 ( 7 ) 2018年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER INST PHYSICS

We fabricated thermally driven metal-free soft-actuators consisting of poly(ethylene terephthalate) (PET) threads as the actuator and carbon nanotube (CNT) yarns as the heating source. The mechanical force, displacement, and response behavior of various structures of the coil-shaped soft-actuators were characterized. The actuation performance of the soft-actuators containing a homogeneous arrangement of PET threads and CNT yarns in their cross-sectional profile was the highest. The results of the calculations based on the heat diffusion equations indicated that inhomogeneous heat generation in the soft-actuator causes parts of the actuator to remain unheated and this interferes with the mechanical motions. Homogeneous thermal distribution in the soft-actuators, namely, the use of a multifilament structure, yields the highest performance in terms of the mechanical force and displacement. (C) 2018 Author(s).

DOI： 10.1063/1.5033487

Web of Science

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Expansion of Shockley stacking fault observed by scanning electron microscope and partial dislocation motion in 4H-SiC 査読

Yoshifumi Yamashita, Ryu Nakata, Takeshi Nishikawa, Masaki Hada, Yasuhiko Hayashi

Journal of Applied Physics 123 ( 16 ) 161580-1 - 161580-5 2018年4月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Institute of Physics Inc.

We studied the dynamics of the expansion of a Shockley-type stacking fault (SSF) with 30° Si(g) partial dislocations (PDs) using a scanning electron microscope. We observed SSFs as dark lines (DLs), which formed the contrast at the intersection between the surface and the SSF on the (0001) face inclined by 8° from the surface. We performed experiments at different electron-beam scanning speeds, observing magnifications, and irradiation areas. The results indicated that the elongation of a DL during one-frame scanning depended on the time for which the electron beam irradiated the PD segment in the frame of view. From these results, we derived a formula to express the velocity of the PD using the elongation rate of the corresponding DL during one-frame scanning. We also obtained the result that the elongation velocity of the DL was not influenced by changing the direction in which the electron beam irradiates the PD. From this result, we deduced that the geometrical kink motion of the PD was enhanced by diffusing carriers that were generated by the electron-beam irradiation.

DOI： 10.1063/1.5010861

Scopus

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In-situ X-ray diffraction reveals the degradation of crystalline CH3NH3PbI4 by water-molecule collisions at room temperature 査読国際共著

Masaki Hada, Yoichi Hasegawa, Ryota Nagaoka, Tomoya Miyake, U. Abdullaev, Hiromi Ota, Takeshi Nishikawa, Yoshifumi Yamashita, and Yasuhiko Hayashi

Japanese Journal of Applied Physics 57 ( 2 ) 028001-1 - 028001-3 2018年2月

In-situ X-ray diffraction reveals the degradation of crystalline CH3NH3PbI3 by water-molecule collisions at room temperature 査読

Masaki Hada, Yoichi Hasegawa, Ryota Nagaoka, Tomoya Miyake, U. Abdullaev, Hiromi Ota, Takeshi Nishikawa, Yoshifumi Yamashita, Yasuhiko Hayashi

Japanese Journal of Applied Physics 2018年

Self-Assembled C-60 Fullerene Cylindrical Nanotubes by LLIP method 査読

Venkata Krishna R. Rao, P. S. Karthik, Venkata K. Abhinav, Zaw Lin, May Thu Zar Myint, Takeshi Nishikawa, Masaki Hada, Yoshifumi Yamashita, Yasuhiko Hayashi, Surya Prakash Singh

2016 IEEE 16TH INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY (IEEE-NANO) 303 - 306 2016年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：IEEE

In this article, we report C60 Fullerene Nano Cylindrical Tubes (FNCT). The FNCTs were synthesized by a liquid-liquid interface precipitation (LLIP) method using m-Xylene as a saturating solvent and TBA (Tetra butyl alcoholic) as precipitation agent leading to the formation of FNCTs with uniquely structured and well oriented size and shape. The experiment was conducted in a closed atmosphere maintaining a low temperature. The main advantage of these structures is that they are stable up to 5 months in normal room temperature. Characterizations were done to the FNCTs and concluded to have applications in the field of electronics. Enhanced semiconducting properties have been observed in the nanostructures which can be used in the application of solar cells, FET transistors, etc.

Web of Science

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Sb-doping effect on the dislocation motion in various Si1-xGex films

Shinya Maki, Yoshifumi Yamashita, Tatsuya Fushimi, Yutaka Ohno, Ichiro Yonenaga, Takeshi Nishikawa, Yasuhiko Hayashi

Proceedings of The Forum on the Science and Technology of Silicon Materials 2014 75 - 80 2014年11月

Electric-field effects on the stability of impurity levels on a grain boundary in mc-Si for solar cells

Masakazu Yabuki, Yoshifumi Yamashita, Tatsuro Tokura, Takeshi Nishikawa, Yasuhiko Hayashi

Proceedings of The Forum on the Science and Technology of Silicon Materials 2014 209 - 213 2014年11月

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