KOJIMA Kazunobu

J-GLOBAL         Last updated: Dec 9, 2019 at 11:52
 
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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
ORCID ID
0000-0003-0128-1978

Academic & Professional Experience

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

Awards & Honors

 
Jul 2019
Evaluation of Subsequent Implantation Effect into Mg Implanted Region in GaN, Best poster Award, The 13th International Conference on Nitride Semiconductors (ICNS-13)
Winner: S. Takashima, R. Tanaka, K. Ueno, H. Matsuyama, Y. Fukushima, M. Edo, K. Shima, K. Kojima, S. F. Chichibu, and A. Uedono
 
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

 
Roles of carbon impurities and intrinsic nonradiative recombination centers on the carrier recombination processes of GaN crystals
K. Kojima, F. Horikiri, Y. Narita, T. Yoshida, H. Fujikura, and S. F. Chichibu
Applied Physics Express   13 012004   Dec 2019   [Refereed]
Suppression of green luminescence of Mg-ion-implanted GaN by subsequent implantation of fluorine ions at high temperature
M. Takahashi, A. Tanaka, Y. Ando, H. Watanabe, M. Deki, M. Kushimoto, S. Nitta, Y. Honda, K. Shima, K. Kojima, S. F. Chichibu, K. J. Chen, and H. Amano
Phys. Status Solidi B   2019 1900554   Nov 2019   [Refereed]
In-plane optical polarization and dynamic properties of the near-band-edge emission of an m-plane freestanding AlN substrate and a homoepitaxial film
S. F. Chichibu, K. Kojima, K. Hazu, Y. Ishikawa, K. Furusawa, S. Mita, R. Collazo, Z. Sitar, and A. Uedono
Applied Physics Letters   115(15) 151903-1-5   Sep 2019   [Refereed]
Theoretical Formulation of Experimentally Observed Quantum Efficiency of Radiation in Semiconducting Crystal
H. Asai, K. Kojima, S.F.Chichibu and K.Fukuda
PHYSICAL REVIEW APPLIED   12 014002-1-014002-12   Jun 2019   [Refereed]

Misc

 
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 (IWJT 2019)      2019   [Refereed]
Yoshida Y, Kojima K, Shiraiwa M, Awaji Y, Kanno A, Yamamoto N, Chichibu S.F, Hirano A, Ippommatsu M.
2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings      2019   [Refereed]
Kojima K, Yoshida Y, Shiraiwa M, Awaji Y, Kanno A, Yamamoto N, Chichibu S.
European Conference on Optical Communication, ECOC   2018-September    2018   [Refereed]
Sakai S, Kojima K, Chichibu S.F, Yamaguchi A.A.
Conference Digest - IEEE International Semiconductor Laser Conference   2018-September 135-136   2018   [Refereed]
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]

Conference Activities & Talks

 
Fabrication of planar ZnO microcavities for near ultraviolet polariton laser operating at room temperature
K. Shima, K. Furusawa, K. Kojima, and S. F. Chichibu
4th International Workshop on UV Materials and Devices (IWUMD-IV)   11 Sep 2019   
全方位フォトルミネセンス(ODPL)法を用いた半導体結晶の光物性評価 [Invited]
K. Kojima and S. F. Chichibu
Sep 2019   
Theoretical analysis of photo-recycling effect on external quantum efficiency considering spatial Carrier dynamics
H. Asai, K. Kojima, S. F. Chichibu, and K. Fukuda
2019 International Conference on Solid State Devices and Materials (SSDM2019)   2 Sep 2019   
Optical characterization and gain calculation of AlGaN quantum wells [Invited]
K. Kojima
1st International Workshop on AlGaN based UV-Laser diodes   Aug 2019   
Impact of vacancy complexes on the nonradiative recombination processes in III- N devices [Invited]
S. F. Chichibu, K. Shima, K. Kojima, S. Ishibashi, and A. Uedono
The 13th International Conference on Nitride Semiconductors (ICNS-13)   12 Jul 2019   

Social Contribution

 
[Informant]  (Tohoku University)  Aug 2019
[Informant]  (Tohoku University)  Jun 2019
[Informant]  (Tohoku University)  Feb 2019