Yasuhiko Ishikawa
Toyohashi University of Technology
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Yasuhiko Ishikawa.
Nanophotonics and Micro/Nano Optics IV | 2018
Motoki Yako; Yasuhiko Ishikawa; Eiji Abe; Kazumi Wada
Because of the 4% lattice mismatch between Ge and Si, threading dislocations (TDs) are generated in Ge epilayers on Si, deteriorating the performance of Ge devices on Si platform. We recently modeled the reduction of TD density in heteroepitaxial coalesced layers in terms of the bending of TDs induced by image forces at non-planar selective epitaxial growth (SEG) surfaces before the coalescence. The reduction of TD density was quantitatively verified for Ge layers on (001) Si with line-and-space SiO2 masks. In the present paper, detailed theoretical calculation and experimental results are presented. Numerical calculation shows that the image force is large enough to bend/move dislocations considering the Peierls stress or the mobility of TDs in Ge. Transmission electron microscope observations show that the TD bending is certainly induced. The TD density is lower above the SiO2 masks, as confirmed by the etch pit method. Such spatial distribution is well explained by the image-force-induced dislocation bending.
international conference on group iv photonics | 2018
Michiharu Nishimura; Yoshiyuki Tsusaka; Junji Matsui; Yasuhiko Ishikawa
IEEE Journal of Selected Topics in Quantum Electronics | 2018
Motoki Yako; Yasuhiko Ishikawa; Eiji Abe; Kazumi Wada
AiMES 2018 Meeting (September 30 - October 4, 2018) | 2018
Michiharu Nishimura; Kazuki Kawashita; Yasuhiko Ishikawa
電子情報通信学会技術研究報告. LQE, レーザ・量子エレクトロニクス | 2011
Koji Yamada; Tai Tsuchizawa; Toshifumi Watanabe; Hiroyuki Shinojima; Hidetaka Nishi; R. Kou; Sungbong Park; Yasuhiko Ishikawa; Kazumi Wada; Seiichi Itabashi
220th ECS Meeting | 2011
Kazumi Wada; Yasuhiko Ishikawa
電子情報通信学会技術研究報告. PN, フォトニックネットワーク | 2009
Sungbong Park; Shinya Takita; Yasuhiko Ishikawa; Jiro Osaka; Kazumi Wada
電子情報通信学会技術研究報告. LQE, レーザ・量子エレクトロニクス | 2009
Sungbong Park; Shinya Takita; Yasuhiko Ishikawa; Jiro Osaka; Kazumi Wada
Archive | 2009
Kazumi Wada; Sungbong Park; Yasuhiko Ishikawa
Archive | 2008
Mathias Ziegler; R. Pomraenke; Max Felger; Jens W. Tomm; P. Vasa; Christoph Lienau; Marwan Bou; Alvaro Gomez-Iglesias; Martin Reufer; F. Bugge; G. Erbert; Martin F. Schubert; Jiuru Xu; Jong Kyu Kim; Emil Fred; Sukho Yoon; Cheolsoo Sone; Sakong Tan; Peng Huei Lim; Yosuke Kobayashi; Shinya Takita; Yasuhiko Ishikawa; Kazumi Wada; Nan Ei Yu; Chul Kang; Hyung Keun Yoo; Changsoo Jung; Yeung Lak Lee; Jong-Lam Lee; Kokoro Kitamura