KOJIMA Kazunobu

J-GLOBAL         Last updated: Jun 11, 2019 at 11:03
 
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Name
KOJIMA Kazunobu
URL
http://db.tohoku.ac.jp/whois/e_detail/b5e241ac14805eb9dee77d443744ed3a.html
Affiliation
Tohoku University
Section
Institute of Multidisciplinary Research for Advanced Materials Division of Measurements Quantum Optoelectronics
Job title
Associate Professor
Research funding number
30534250

Academic & Professional Experience

 
Apr 2014
 - 
Today
Associate Professor, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
 

Awards & Honors

 
Jun 2019
"Photoluminescence Studies of Sequentially Mg and H Ion-implanted GaN with Various Implantation Depths and Crystallographic Planes", Best Paper Award,, 19th International Workshop on Junction Technology (IWJT2019),
Winner: K. Shima, K. Kojima, A. Uedono, and S. F. Chichibu
 
Jul 2008
EMS Award, EMS
Winner: Kazunobu Kojima
 
Mar 2008
Young Scientist Oral Presentation Award, Japan Society of Applied Physics
Winner: Kazunobu Kojima
 

Published Papers

 
Annealing behavior of vacancy-type defects in Mg- and H-implanted GaN studied using monoenergetic positron beam
Akira Uedono, Hiroko Iguchi, Tetsuo Narita, Keita Kataoka, Werner Egger, Tonjes Koschine, Christoph Hugenschmidt, Kohei Shima, Kazunobu Kojima, Shigefusa F.Chichibu, Shoji Ishibashi
Physica Status Solidi B   256 1900104-1-1900104-12   May 2019   [Refereed]
Impacts of growth temperature on the structural properties of BGaN films grown by metalorganic vapor phase epitaxy using trimethylboron
K. Ebara, K. Mochizuki, Y. Inoue, T. Aoki, K. Kojima, S. F. Chichibu, and T. Nakano
Japanese Journal of Applied Physics   58SC SC1042-1-SC1042-5   May 2019   [Refereed]
Quantification of the quantum efficiency of radiation of a freestanding GaN crystal placed outside an integrating sphere
Kazunobu Kojima, Kenichiro ikemura, Shigefusa, F. Chichibu
Appl. Phys. Express   12 062010-1-062010-4   May 2019   [Refereed]
Room-temperature photoluminescence lifetime for the near-band-edge emission of epitaxial and ion-implanted Mg-doped GaN on GaN structures
S. F. Chichibu, K. Shima, K. Kojima, S. Takashima, K. Ueno, M. Edo, H. Iguchi, T. Narita, K. Kataoka, S. Ishibashi, and A. Uedono
Japanese Journal of Applied Physics   58(SC) SC0802-1-SC0802-10   May 2019   [Refereed]
Carrier localization structure combined with current micropaths in AlGaN quantum wells grown on an AlN template with macrosteps
K. Kojima, Y. Nagasawa, A. Hirano, M. Ippommatsu, Y. Honda, H. Amano, I. Akasaki, and S. F. Chichibu
Applied Physics Letters   114 011102   Jan 2019   [Refereed]

Misc

 
High Quality Bulk GaN Crystal Grown by Acidic Ammonothermal Method
2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS)      2016   [Refereed]
Polarity Dependent Radiation Hardness of GaN
M. Matsuo, T. Murayama, K. Koike, S. Sasa, M. Yano, S. Gonda, R. Ishigami, K.Kume, A. Uedono, T. Ohtomo, E. Furukawa, Y. Yamazaki, K. Kojima, S. Chichibu
IEEE Xplore Digital Library (2015)      Apr 2015   [Refereed]
1614
K. Kojima, K. Hikoyama, T. Nakamura, T. Kojima, T. Asano, S. Noda
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest      Oct 2013
We propose a method to control the modal volume of a photonic crystal nanocavity. This method provides a large amount of freedom to control cavity quantum electrodynamics in solid state without energy dissipation. © 2013 IEEE.
T. Nakamura, T. Asano, K. Kojima, T. Kojima, S. Noda
Proceedings of SPIE - The International Society for Optical Engineering   8269 1-82690   May 2012
Modulation of the Purcell effect by controlling both the Q-factor and detuning in a quantum-dot-nanocavity coupled system was investigated. The Q-factor and detunings are controlled independently by using a nanocavity, a waveguide and a reflector ...
Yamaguchi Atsushi A., Kojima Kazunobu
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 3-4   9(3-4) 834-837   2012   [Refereed]

Conference Activities & Talks

 
Photoluminescence Studies of Sequentially Mg and H Ion-implanted GaN with Various Implantation Depths and Crystallographic Planes
K. Shima, K. Kojima, A. Uedono, and S. F. Chichibu
19th International Workshop on Junction Technology (IWJT2019)   6 Jun 2019   
Quantification of external quantum efficiency for near-band-edge emission of freestanding h-BN crystals under photo-excitation
K. Kojima, K. Watanabe, T. Taniguchi, and S. F. Chichibu:
Compound Semiconductor Week 2019 (CSW 2019), Spectroscopy & growth of h-BN II   19 May 2019   
Recent progress in acidic ammonothermal growth of GaN crystals [Invited]
S. F. Chichibu, M. Saito, Q. Bao, D. Tomida, K. Kurimoto, K. Shima, K. Kojima, and T. Ishiguro
11th International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials (ISPLasma2019)   17 Mar 2019   
Different Nonradiative Recombination on Terraces and Macrosteps of Uneven QW for 285 nm LED Grown on AlN Template with Dense Macrosteps
Yosuke Nagasawa, Kazunobu Kojima, Ryuichi Sugie, Akira Hirano, Masamichi Ippommatsu, Hiroshi Amano, Isamu Akasaki,Shigefusa F. Chichibu
11 Dec 2018   
Recent progress of acidic ammonothermal growth of GaN [Invited]
S. F. Chichibu, M. Saito, Q. Bao, K. Shima, D. Tomida, K. Kojima, and T. Ishiguro
4th Intensive Discussion on Growth of Nitride Semiconductors (IDGN-4)   19 Nov 2018   

Others

 
Jun 2019   Probing Semiconductor Crystals with a Sphere of Light
https://www.tohoku.ac.jp/en/press/sphere_of_light.html
Feb 2019   Understanding high efficiency of deep ultraviolet LEDs
https://www.tohoku.ac.jp/en/press/deep_ultraviolet_LEDs.html