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Tsuyoshi Yoshitake Last modified date:2017.09.04



Graduate School
Undergraduate School
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E-Mail
Homepage
http://yoshitake.private.coocan.jp/univ_lab/index-e.htm
Quantum Materials Physics Research division, Department of Engineering Sciences for Electronics and Materials, Kyushu University .
Academic Degree
Dr. Eng.
Field of Specialization
Applied Physics, Thin Solid Film, Solid State Physics
Outline Activities
● Research
We make a study of an ecologically friendly new material, which is rich-abundant and is made from non-toxic elements, for an electric device. For example, they are diamond which is a high-pressure and high-temperature phase, diamond-like carbon which is a non-equilibrium phase, beta iron disilicide which is a candidate semiconductor for an opt-electric device and the others. We fabricate them by the film preparation method using a laser and a plasma technology. In addition, we develop the film preparation system in cooperation with some small and medium enterprises. The detail subjects of the study are as follows.
【Low temperature growth of diamond films by pulsed laser deposition】
【Fabrication of hydrogen-free diamond-like carbon films by physical vapor depositions and their application for coating】
【Research concerning ecologically friendly semiconductors and their application for electric devices】
【Research in a semiconductor / ferromagnetic metal superlattice】
【Research in a new cathode material for a lithium ion battery】
【Development of the innovative film preparation system】

● Education
I belong to Department of Engineering Sciences for Electronics and Materials. My additional affiliation for graduate school education is Department of Applied Science for Electronics and Materials. Besides, I contribute to the undergraduate school education and have the following classes: “Lecture on mechanics and practice”, “Elemental experiment on physics” and “Soft energy for sustainability”.

● Social activities
I contribute to the study group of The Japan Society of Applied Physics as a manager and contribute to Kyushu Chapter of The Japan Society of Applied Physics as an administrator.
In Kyushu University, I hold a additional post as a technical advisor of Kyushu TLO Company, Limited. In the year 2003, I had lectures in an open class and a seminar of the graduate school.
I have a lecture of the training institute organized by The Japan Cooperation agency (JICA) and Kyushu University.
Research
Research Interests
  • Fabrication of new spintronics devises based on ferromagnetic Fe3Si/semiconducting FeSi2 heterostructural artificial lattices using nanofabrication techniques
    keyword : Fe-Si, spintronics, CPP, lithography
    2011.04【Research in a semiconductor / ferromagnetic metal superlattice】 There have been few studies for the hetero-structure, such as the ferromagnetic metal /semiconductor multi-layered film, because the fabrication is extremely difficult. However, this hetero-structure has a possibility that the anti-ferromagnetic and ferromagnetic coupling among the ferromagnetic layers can be switched through the intermediary of the semiconducting layers, whose electrical band structure can be changed by the heat and photons. Fe-Si system has both the semiconducting phases such as beta-FeSi2, amorphous FeSi2 and FeSi, and the ferromagnetic ones such as Fe3Si and Fe、and expected as a new candidate for spintronic. We fabricate the Fe3Si or Fe / nanocrystalline (NC) FeSi2 multi-layered films, and study a new physical properties at optical, electrical and magnetic points of view..
  • Applications of ultrananocrystalline diamond/hydrogenated amorphous carbon composite (UNCDa/-C:H) films to phtodiodes including solar cells
    keyword : ultrananocrystalline diamond, UNCD, photodiodes, photoviltaics, solar cells
    2011.04【Low temperature growth of diamond and nanocrystalline diamond films by pulsed laser deposition】Diamond has many excellent properties such as the highest hardness, high chemical inertness, low friction coefficient and high optical transparency and thus it is expected for a variety of applications. In addition, it overcomes ecological and resources problems. Nanocrystalline diamond is also expected as a candidate for coating and heat sink, because it is easy to be grown and it has a smooth surface like DLC, and because it is stable for temperature and has high heat conductivity similarly to diamond. In this study, we attempt to grow them at a low substrate temperature by pulsed laser deposition in order to realize the application for a heat sink coating and an electric device..
  • Fabrication of cubic β-AlN films and evaluations of their physical properties
    keyword : cubic AlN, cubic, physical vapor deposition
    2005.04.
  • Study on ultrananocrystalline diamond films prepared by a coaxial arc plasma gun and their applications to hard coating and photovoltaics
    keyword : ultrananocrystaloine diamond, coaxial arc plasma gun, hard coating, photovoltaics
    2005.04.
  • Farbrication of ultrananocrystalline diamond films by pulsed laser deposition
    keyword : ultrananocrystalline diamond, UNCD. pulsed laser deposition, PLD
    2000.04~2006.03【Low temperature growth of diamond and nanocrystalline diamond films by pulsed laser deposition】Diamond has many excellent properties such as the highest hardness, high chemical inertness, low friction coefficient and high optical transparency and thus it is expected for a variety of applications. In addition, it overcomes ecological and resources problems. Nanocrystalline diamond is also expected as a candidate for coating and heat sink, because it is easy to be grown and it has a smooth surface like DLC, and because it is stable for temperature and has high heat conductivity similarly to diamond. In this study, we attempt to grow them at a low substrate temperature by pulsed laser deposition in order to realize the application for a heat sink coating and an electric device..
  • Applications of iron disilicides to photovoltaics and NIR sensors
    keyword : beta iron disilicide, nanocrystalline iron disilicide, sputterng
    1999.04【Research concerning ecologically friendly semiconductors and their application for electric devices】 Nowadays, it is necessary for the materials tractable for the industrial application to have not only excellent material properties but also favorable ecological properties such as non-toxicity, abundance, and recyclability. Semiconducting beta-FeSi2 has excellent properties such as a direct optical band gap of 0.8-0.85 eV, a large optical absorption coefficient, good physical-chemical stability at high temperature and high resistance to the oxidation, and the possibility of growing epitaxially on Si substrates. In addition to these material properties, it overcomes ecological and resources problems because of its nontoxicity and the rich deposits that are present on earth. So it is expected to be a useful promising material for solar cells with theoretical efficiencies from 16 to 23 % in the future. In addition, recently it was reported that amorphous forms of iron disilicide also indicated semiconducting properties. It is very attractive at both the physical and engineering points of view because it can be grown easily on various kinds of substrate at room temperature. In this study, we fabricated thin films both by pulsed laser deposition (PLD) and by facing target DC sputtering (FTDCS) which was advantageous for the engineering applications, for the purpose of applying for the electric device such as a solar sell..
  • Fabrication of semiconductor/ferromagnetic metal atrificial lattices and study on their new physical phenomena based on spin-dependent conduction
    keyword : heterostructure, semiconductor, ferromagnetic, interlayer coupling, artificial lattices
    2001.04~2011.03【Research in a semiconductor / ferromagnetic metal superlattice】 There have been few studies for the hetero-structure, such as the ferromagnetic metal /semiconductor multi-layered film, because the fabrication is extremely difficult. However, this hetero-structure has a possibility that the anti-ferromagnetic and ferromagnetic coupling among the ferromagnetic layers can be switched through the intermediary of the semiconducting layers, whose electrical band structure can be changed by the heat and photons. Fe-Si system has both the semiconducting phases such as beta-FeSi2, amorphous FeSi2 and FeSi, and the ferromagnetic ones such as Fe3Si and Fe、and expected as a new candidate for spintronic. We fabricate the Fe3Si or Fe / nanocrystalline (NC) FeSi2 multi-layered films, and study a new physical properties at optical, electrical and magnetic points of view..
  • Fabrication of diamond-like carbon films by pulsed laser deposition
    keyword : DLC, PLD
    1996.04~2003.03【Fabrication of hydrogen-free diamond-like carbon films by physical vapor depositions and their application for coating】 Diamond-like carbon (DLC) have been adapted for coating on a metal mold, a tool and a machine part, because it has a high hardness, a low friction coefficient, a high adhesion and so on. DLC containing hydrogen has been mainly fabricated by a chemical vapor deposition method and have been applied for various industries as mentioned above. Hydrogen-free DLC prepared by physical vapor deposition methods has received much attention in recent years, because the deposited films have more excellent properties than those prepared by CVD. In general, hydrogen-free DLC is prepared by sputtering now. In this study, in order to grow a hydrogen-free DLC film having more excellent properties, we adapt a pulsed laser deposition method using a graphite target..
Current and Past Project
  • Ultrananocrystalline diamond (UNCD)/hydrogenated amorphous carbon (a-C:H) composite (UNCD/a-C:H) films, which are comprised of diamond crystallites with diameter of less than 10 nm embedded in an a-C:H matrix, possess large optical absorption coefficients in the visible range due to a large number of grain boundaries. Here, the grain boundaries exactly means that the interfaces between UNCD crystallites and those between UNCD and an a-C:H matrix. We have confirmed evident photoconduction corresponding to the large optical absorption. In this work, we are committed to apply this photoconduction to photovoltaics.
Academic Activities
Books
1. Mahmoud Shaban and Tsuyoshi Yoshitake, n-Type β-FeSi2/p-type Si near-infrared photodiodes prepared by facing-targets direct-current sputtering, InTech Open Access Publisher, in Advances in Photodiodes (InTech, 2010) Chap. 1., 2010.12.
Papers
1. Abdelrahman Ekria, Mahmoud Shaban, Takanori Hanada, Nathaporn Promros, Tsuyoshi Yoshitake, Current transport mechanisms in n-type ultrananocrystalline diamond/p-type Si heterojunctions, Journal of Nanoelectronics and Nanotechnology, in press, 2016.08.
2. Abdelrahman Zkria, Yuki Katamune, Tsuyoshi Yoshitake, Effects of Nitrogen doping on the electrical conductivity and optical absorption of ultrananocrystalline diamond/hydrogenated amorphous carbon films prepared by coaxial arc plasma dep, Jpn. J. Appl. Phys., in press, 2016.06.
3. Nathaporn Promros, Ryuji Baba, Motoki Takahara, Tarek M. Mostafa, Phongsaphak Sittimart, Mahmoud Shaban, Tsuyoshi Yoshitake, Epitaxial Growth of beta-FeSi2 Thin Films on Si(111) Substrates by Radio Frequency Magnetron Sputtering and Their Application to Near-Infrared Photodetection, Jpn. J. Appl. Phys., Vol. 55, No. 6S2, 06HC03, 2016.06.
4. Hiroshi Naragino, Mohamed Egiza, Aki Tominaga, Kouki Murasawa, Hidenobu Gonda, Masatoshi Sakurai, Tsuyoshi Yoshitake, Room-temperature hard coating of ultrananocrystalline diamond/nonhydrogenated amorphous carbon composite films on tungsten carbide by coaxial arc plasma deposition, Jpn. J. Appl. Phys. (Rapid Communication), Vol. 55, No. 3, 030302., 2016.01.
5. Takeshi Hara, Kenji Hanada, Tsuyoshi Yoshitake, Detection Methods of Diamond Diffraction Peaks in Ultrananocrystalline diamond?Amorphous Carbon Composite Films by X-ray Diffraction Measurement with Semiconductor Counter Detector, Jpn. J. Appl. Phys, to be published, 2015.11.
6. Yūki Katamune, Satoshi Takeichi, Shinya Ohmagari, Tsuyoshi Yoshitake, Hydrogenation effects on carrier transport in boron-doped ultrananocrystalline diamond/amorphous carbon films prepared by coaxial arc plasma deposition, J. Vac. Sci. Tech. A, Vol. 6, Issue 6 (2015) 061514., 2015.09, [URL].
7. Abdelrahman Zkria, Hiroki Gima, Mahmoud Shaban, Tsuyoshi Yoshitake, Electrical Characteristics of Nitrogen-Doped Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films Prepared by Coaxial Arc Plasma Deposition
, Appl. Phys. Express, Vol. 8, No. 9 (2015) 095101, 2015.09.
8. Hiroshi Naragino, Aki Tominaga, Kenji Hanada, Tsuyoshi Yoshitake, A synthesis method of ultrananocrystalline diamond in powder employing a coaxial arc plasma gun, Appl. Phys. Express, Vol. 8, No. 7 (2015) 075101., 2015.07.
9. Tomohiro Yoshida, Yūtaro Ueda, Takeshi Daio, Aki Tominaga, Toshihiro Okajima, Tsuyoshi Yoshitake, Heteroepitaxial growth of b-AlN films on sapphire (0001) in nitrogen atmospheres by pulse laser deposition, Jpn. J. Appl. Phys., Vol. 54, No. 6S1, 06FJ05., 2015.06.
10. Kenji Hanada, Tomohiro Yoshida, You Nakagawa, Hiroki Gima, Aki Tominaga, Masaaki Hirakawa, Yoshiaki Agawa, Takeharu Sugiyama, Tsuyoshi Yoshitake, Hardness and modulus of ultrananocrystalline diamond/hydrogenated amorphous carbon composite films prepared by coaxial arc plasma deposition, Appl. Phys. A, Vol. 119, Issue 1, pp 205-210.
, 2015.02.
11. Tomohiro Yoshida, Kenji Hanada, Hiroki Gima, Ryota Ohtani, Kazushi Sumitani, Hiroyuki Setoyama, Aki Tominaga, Tsuyoshi Yoshitake, Influences of repetition rate of arc discharges on hardness and modules of ultrananocrystalline diamond films prepared by coaxial arc plasma deposition, Mater. Res. Express, Vol. 2, No.1 (2015) 015021., 2015.01.
12. Shinya Ohmagari, Takanori Hanada, Yūki Katamune, Sausan Al-Riyami, Tsuyoshi Yoshitake, Carrier Transport and Photodetection in Heterojunction Photodiodes Comprising n-Type Silicon and p-Type Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films, Jpn. J. Appl. Phys. , Vol. 53, No. 5, 050307, 2014.05.
13. Ken-ichiro Sakai, Yuta Noda, takeshi Daio, Daiki Tsumagari, Aki Tominaga, Kaoru Takeda, Tsuyoshi Yoshitake, Current-induced Magnetization Switching at Low Current Densities in CPP Structural Fe3Si/FeSi2 Artificial Lattices, Jpn. J. Appl. Phys. , Vol. 53, Issue 2S, 02BC15, 2014.02.
14. Ken-ichiro Sakai, Yuta Noda, Daiki Tsumagari, Hiroyuki Deguchi, Kaoru Takeda, Tsuyoshi Yoshitake, Temperature-Dependent Interlayer coupling in Fe3Si/FeSi2 artificial lattices, Phys. Status Solidi A, Vol. 211, No. 2, 323-328, 2014.02.
15. Sausan Al-Riyami, Hiroki Gima, Hiroshi Akamine, Tsuyoshi Yoshitake, Chemical Bonding of Nitrogenated Ultrananocrystalline Diamond Films Deposited on Titanium Substrates by Pulsed Laser Deposition, ECS J. Solid State Sci. Technol., Vol. 2, issue 11 (2013) M33-38, 2013.11.
16. Yutaro Ueda, Takeshi Daio, Tomohiro Yoshida, Aki Tominaga, Toshihiro Okajima, Tsuyoshi Yoshitake, Crystalline-Structural Evaluations of Cubic AlN Thin Films Heteroepitaxially Grown on Sapphire(0001) by Pulsed Laser Deposition , Jpn. J. Appl. Phys., Vol. 52, No. 8 (2013) 08JE03., 2013.06, [URL].
17. Sausan Al-Riyami, Hiroki Gima, Tsuyoshi Yoshitake, Effects of Hydrogen and Nitrogen Atmospheres on Growth of Ultrananocrystalline Diamond/Amorphous Carbon Composite Films by Reactive Pulsed Laser Deposition, Jpn. J. Appl. Phys., Vol. 52, No. 6 (2013) 06GG06., 2013.06, [URL].
18. Yuki Katamune, Shinya Ohmagari, Sausan Al-Riyami, Seishi Takagi, Mahmoud Shaban, Tsuyoshi Yoshitake, Heterojunction Diodes Comprising p-Type Ultrananocrystalline Diamond Films Prepared by Coaxial Arc Plasma Deposition and n-Type Silicon Substrates , Jpn. J. Appl. Phys., Vol. 52, No. 6 (2013) 065801., 2013.06, [URL].
19. Nathaporn Promros, Li Chen, Tsuyoshi Yoshitake, Evaluation of n-Type Nanocrystalline FeSi2/p-Type Si Heterojunctions Prepared by Pulsed Laser Deposition as Near-Infrared Photodetectors, J. Nanosci. Nanotechnol. , Vol. 13, No. 5 (2013) pp. 3577–3581., 2013.05.
20. Shotra Izumi, Mahmoud Shaban, Nathaporn Promros, Keita Nomoto, Tsuyoshi Yoshitake, Near-Infrared Photodetection of beta-FeSi2/Si Heterojunction Photodiodes at Low Temperatures
, Appl. Phys. Lett., Appl. Phys. Lett. Vol. 102, Issue 3 (2013) 032107, 2013.02.
21. E. Garratt, S. AlFaify, Tsuyoshi Yoshitake, Yuki Katamune, M. Bowden, M. Nandasiri, M. Ghantasala, D. C. Mancini, S. Thevuthasan, A. Kayani, Effect of chromium underlayer on the properties of nano-crystalline diamond films, Appl. Phys. Lett., No. 102, Issue 1 (2012) 011913., 2013.01, [URL].
22. Nathaporn Promros, Kyohei Yamashita, Ryuhei Iwasaki, Tsuyoshi Yoshitake, Effects of Hydrogen Passivation on Near-Infrared Photodetection of n-Type -FeSi2/p-Type Si Heterojunction Photodiodes, Jpn. J. Appl. Phys. , Vol. 51, No. 10 (2012) 108006., 2012.10.
23. , [URL].
24. Nathaporn Promros, Kyohei Yamashita, Shota Izumi, Ryu¯hei Iwasaki, Mahmoud Shaban, Tsuyoshi Yoshitake, Near-Infrared Photodetection of n-Type β-FeSi2/intrinsic Si/p-Type Si Heterojunctions at low temperatures, Jpn. J. Appl. Phys. , Vol. 51, No. 9 (2012) 09MF02., 2012.09.
25. Shinya Ohmagari, Tsuyoshi Yoshitake, p-Type Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films Prepared by Pulsed Laser Deposition and Their Application to Photodetectors, Jpn. J. Appl. Phys., Vol. 51, No. 9, (2012) 090123 (Selected Topics in Applied Physics), 2012.07.
26. Yuki Katamune, Shinya Ohmagari, Tsuyoshi Yoshitake, Boron-Induced Dramatically Enhanced Growth of Diamond Grains in Nanocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films deposition by Coaxial Arc Plasma Deposition, Jpn. J. Appl. Phys., Vol. 51, No. 7 (2012) 078003., 2012.07, [URL].
27. Yuki Katamune, Shinya Ohmagari, Itsuroh Suzuki, Tsuyoshi Yoshitake, Effects of Aluminum Incorporation on Diamond Grain Growth in Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films Prepared by Coaxial Arc Plasma Deposition, Jpn. J. Appl. Phys., Vol. 51, No. 6 (2012) 068002., 2012.06, [URL].
28. Shinya Ohmagari, Tsuyoshi Yoshitake, Deep-Ultraviolet Light Detection of p-Type Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films, Appl. Phys. Express, Vol. 5, No. 6 (2012) 065202., 2012.06, [URL].
29. Shinya Ohmagari, Yūki Katamune, Hikaru Ichinose, and Tsuyoshi Yoshitake, "Enhanced growth of diamond grains in ultrananocrystalline diamond/hydrogenated amorphous carbon composite films by pulsed laser deposition with boron-blended graphite targets", Jpn. J. Appl. Phys., Vol. 51, No. 2 (2012) 025503., 2012.02, [URL].
30. Ken-ichiro Sakai, Takayuki Sonoda, Shin-ichi Hirakawa, Kaoru Takeda, and Tsuyoshi Yoshitake, Current-Induced Magnetization Switching in Fe3Si/FeSi2 Artificial Lattices, Jpn. J. Appl. Phys., Vol. 51, No. 2 (2012) 028004., 2012.02, [URL].
31. Nathaporn Promros, Kyohei Yamashita, Chen Li, Kenji Kawai, Mahmoud Shaban, Toshihiro Okajima, and Tsuyoshi Yoshitake, n-Type Nanocrystalline FeSi2/intrinsic Si/p-Type Si Heterojunction Photodiodes fabricated by Facing-Targets Direct-Current Sputtering, Jpn. J. Appl. Phys., Vol. 51, No. 2 (2012) 021301., 2012.01, [URL].
32. Shin-ichi Hirakawa, Takayuki Sonoda, Ken-ichiro Sakai, Kaoru Takeda1, and Tsuyoshi Yoshitake, Temperature-Dependent Current-Induced Magnetization Switching in Fe3Si/FeSi2/Fe3Si trilayered films, Jpn. J. Appl. Phys., Vol. 50, No. 8 (2011) 08JD06., 2011.08, [URL].
33. Sausan Al-Riyami, Shinya Ohmagari, and Tsuyoshi Yoshitake, Near-Edge X-ray Absorption Fine-Structure Spectroscopic Study on Nitrogen-Doped Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films Prepared by Pulsed Laser Deposition, Jpn. J. Appl. Phys., Vol. 50, No. 8 (2011) 08JD05., 2011.08, [URL].
34. Al-Riyami Sausan, Shinya Ohmagari, and Tsuyoshi Yoshitake, Fourier Transform Infrared Spectroscopic Study of Nitrogen-Doped Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films Prepared by Pulsed laser Deposition, Diamond Relat. Mater., Vol. 20 (2011) pp. 1072-1075., 2011.06.
35. Shinya Ohmagari, Sausan Al-Riyami, and Tsuyoshi Yoshitake, p-Type ultrananocrystalline diamond/hydrogenated amorphous carbon composite/n-type Si heterojunction diodes fabricated by pulsed laser deposition, Jpn. J. Appl. Phys. , Vol. 50, No. 3, 035101., 2011.03, [URL].
36. Kenji Hanada, Tomohiro Yoshida, You Nakagawa, and Tsuyoshi Yoshitake, Formation of Ultrananocrystalline Diamond/Amorphous Carbon Composite Films in Vacuum by Using A Coaxial Arc Plasma Gun, Jpn. J. Appl. Phys., Vol. 49, No. 12 (2010) 125503., 2010.12, [URL].
37. Mahmoud Shaban, Kenji Kawai, Nathaporn Promros, and Tsuyoshi Yoshitake, n-Type Nanocrystalline-FeSi2/p-Type Si Heterojunction Photodiodes Prepared at Room Temperature, IEEE Electron Device Lett., Vol. 31, No. 12, pp. 1428-1430., 2010.12.
38. Sausan Al-Riyami, Shinya Ohmagari, and Tsuyoshi Yoshitake, Electrical Properties and Chemical Bonding Structures of Nitrogen-doped Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films Prepared by Pulsed Laser Deposition, Appl. Phys. Express, Vol. 3, No. 11 (2010) 115102., 2010.11, [URL].
39. Kenji Hanada, Tsuyoshi Yoshitake, Takashi Nishiyama, and Kunihito Nagayama, Time-Resolved Spectroscopic Observation of Deposition Processes of Ultrananocrystalline Diamond/Amorphous Carbon Composite Films by Using a Coaxial Arc Plasma Gun, Jpn. J. Appl. Phys., Vol. 49, No. 8 (2010) 08JF09., 2010.08, [URL].
40. Kenji Hanada, Takashi Nishiyama, Tsuyoshi Yoshitake, and Kunihito Nagayama, Optical Emission Spectroscopic of Deposition Process of Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films by Using a Coaxial Arc Plasma Gun, Diamond Relat. Mater., in press, 2010.05.
41. Kazushi Sumitani, Ryota Ohtani, Tomohiro Yoshida, You Nakagawa, Satoshi Mohri, Tsuyoshi Yoshitake, Influences of repetition rate of laser pulses on growth of crystalline AlN films on sapphire(0001) substrates by pulsed laser deposition, Diamond Relat. Mater., Vol. 19 (2010) pp. 618-620., 2010.04.
42. Sausan Al-Riyami, Shinya Ohmagari, and Tsuyoshi Yoshitake, X-ray Photoemission Spectroscopy of Nitrogen-Doped UNCD /a-C:H Films Prepared by Pulse Laser Deposition, Diamond Relat. Mater., Vol. 19 (2010) pp. 510-513., 2010.04.
43. Shinya Ohmagari, Tsuyoshi Yoshitake, Akira Nagano, Ryota Ohtani, Hiroyuki Setoyama, Eiichi Kobayashi, and Kunihito Nagayama, X-ray photoemission spectroscopy study of ultrananocrystalline diamond/hydrogenated amorphous carbon films prepared by pulsed laser deposition, Diamond Relat. Mater., in press, 2010.04.
44. Shinya Ohmagari, Tsuyoshi Yoshitake , Akira Nagano, Ryota Ohtani, Hiroyuki Setoyama, Eiichi Kobayashi, Takeshi Hara, and Kunihito Nagayama, Formation of p-Type Semiconducting Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films by Boron Doping, Jpn. J. Appl. Phys., Vol. 49, No. 3 (2010) 031302, 2010.03, [URL].
45. Kazushi Sumitani , Ryota Ohtani, Tomohiro Yoshida, You Nakagawa, Satoshi Mohri, and Tsuyoshi Yoshitake, Synchrotron X-ray Diffraction Study of Single-Phase β-AlN Thin Film Heteroepitaxially Grown on a Sapphire(0001) Substrate by Pulsed Laser Deposition, Jpn. J. Appl. Phys. , Vol. 49, No. 2 (2010) 020212., 2010.02.
46. Tsuyoshi Yoshitake, You Nakagawa, Akira Nagano, Ryota Ohtani, Hiroyuki Setoyama, Eiichi Kobayashi, Kazushi Sumitani, Yoshiaki Agawa, and Kunihito Nagayama, Structural and physical characteristics of ultrananocrystalline diamond/hydrogenated amorphous carbon composite films deposited using a coaxial arc-plasma gun, Jpn. J. Appl. Phys., Vol. 49, No. 1, 015503, 2010.01, [URL].
47. Mahmoud Shaban, Shota Izumi, Keita Nomoto, and Tsuyoshi Yoshitake, "n-Type β-FeSi2/intrinsic-Si/p-type Si heterojunction photodiodes for near-infrared light detection at room temperature", Appl. Phys. Lett., Vol.95 (2009) 162102., 2009.10, [URL].
48. Mahmoud Shaban, Keita Nomoto, Shota Izumi, and Tsuyoshi Yoshitake, "Characterization of near-infrared n-type β-FeSi2/p-type Si heterojunction photodiodes at room temperature", Appl. Phys. Lett., 94 (2009) 222113., 2009.06, [URL].
49. Shinya Ohmagari, Tsuyoshi Yoshitake, Akira Nagano, Sausan AL-Riyama, Ryota Ohtani, Hiroyuki Setoyama, Eiichi Kobayashi and Kunihito Nagayama, "Near-edge X-ray absorption fine-structure of ultrananocrystalline diamond/amorphous carbon films prepared by pulsed laser deposition", J. Nanomater., in press, 2009.03.
50. Tsuyoshi YOSHITAKE , Akira NAGANO, Shinya OHMAGARI, Masaru ITAKURA, Noriyuki KUWANO, Ryota OHTANI, Hiroyuki SETOYAMA, Eiichi KOBAYASHI, and Kunihito NAGAYAMA, "Near-edge X-ray absorption fine-structure, X-ray photoemission, Fourier transfer infrared spectroscopies of ultrananocrystalline diamond/hydrogenated amorphous carbon composite films"
, Jpn. J. Appl. Phys., Vol. 48, No. 2 (2009) 020222., 2009.02, [URL].
51. Kenji Hanada, Takashi Nishiyama, Tsuyoshi Yoshitake, and Kunihito Nagayama, "Time-resolved Observation of Deposition Process of Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films in Pulsed Laser Deposition", J. Nanomater., 2009 (2009) 901241., 2009.01.
52. Satoshi MOHRI, Tsuyoshi YOSHITAKE, Takeshi HARA, and Kunihito NAGAYAMA, "Growth of metastable cubic AlN by reactive pulsed laser deposition", Diamond Rel. Mater., 17, pp. 1796-1799, 2008.08.
53. Mahmoud SHABAN, Haruhiko KONDO, Kazuhiro NAKASHIMA, and Tsuyoshi YOSHITAKE, "Electrical and Photovoltaic Properties of n-Type Nanocrystalline FeSi2/p-Type Si Heterojunctions Prepared by Facing Target Direct-current Sputtering at Room Temperature", Jpn. J. Appl. Phys, Vol. 47, No. 7, pp. 5420-5422., 2008.07, [URL].
54. Mahmoud SHABAN, Keita NOMOTO, Kazuhiro NAKASHIMA, and Tsuyoshi YOSHITAKE, "Low-temperature Annealing of n-type β-FeSi2/p-type Si Heterojunctions"
, Jpn. J. Appl. Phys, Vol. 47, No. 5, pp. 3444-3446., 2008.05.
55. Tsuyoshi YOSHITAKE , Satoshi MOHRI, Takeshi HARA, and Kunihito NAGAYAMA, "Growth of metastable β-AlN by pulsed laser deposition", Jpn. J. Appl. Phys, Vol. 47, No. 5, pp. 3600-3602, 2008.05.
56. Kaoru TAKEDA, Tsuyoshi YOSHITAKE , Yoshiki SAKAMOTO, Tetsuya OGAWA, Daisuke HARA, Masaru ITAKURA, Noriyuki KUWANO, Toshinori KAJIWARA, and Kunihito NAGAYAMA, "Enhanced interlayer coupling and magnetoresistance ratio in Fe3Si/FeSi2 superlattices", Appl. Phys. Express, Vol. 1, No. 2 (2008) 021302., 2008.02.
57. Mahmoud SHABAN, Kazuhiro NAKASHIMA, and Tsuyoshi YOSHITAKE, "Substrate Temperature Dependence of Photovoltaic Properties of β-FeSi2/Si Heterojunctions Prepared by Facing-target DC Sputtering"
, Jpn. J. Appl. Phys. Part 1, Vol. 46, No. 12, pp. 77087710, 2007.12.
58. Kaoru TAKEDA, Tsuyoshi YOSHITAKE, Dai NAKAGAUCHI, Tetsuya OGAWA, Daisuke HARA, Masaru ITAKURA, Noriyuki KUWANO, Yoshitsugu TOMOKIYO, Toshiyuki KAJIWARA, and Kunihito Nagayama, "Epitaxy in Fe3Si/FeSi2 superlattices prepared by facing target direct-current sputtering at room tempertaure", Jpn. J. Appl. Phys. Part 1, Vol. 46, No. 12, pp. 78467848., 2007.12.
59. Tsuyoshi YOSHITAKE, Akira NAGANO, Masaru ITAKURA, Noriyuki KUWANO, Takeshi HARA, and Kunihito NAGAYAMA, "Spectral absorption properties of ultrananocrystalline diamond/amorphous carbon composite thin films prepared by pulsed laser deposition", Jpn. J. Appl. Phys. Part 2, Vol.46, No.38, pp.L936 - L938, 2007.10, [URL].
60. Mahmoud SHABAN, Kazuhiro NAKASHIMA, Wataru YOKOYAMA, and Tsuyoshi YOSHITAKE, "Photovoltaic Properties of n-type β-FeSi2/p-type Si Heterojunctions", Jpn. J. Appl. Phys. Part2, Vol. 46, No.27, pp. L667-L669, 2007.07, [URL].
61. T. Yoshitake, T. Ogawa, D. Nakagauchi, D. Hara, M. Itakura, N. Kuwano, Y. Tomokiyo, K. Takeda, T. Kajiwara, M. Ohashi, G. Oomi and K. Nagayama, "Interlayer coupling in ferromagnetic epitaxial Fe3Si/FeSi2 superlattices", Appl. Phys. Lett., 89, 253110, 2006.12, [URL].
62. T. Yoshitake, Y. Inokuchi, A. Yuri, and K. Nagayama, "Direct epitaxial growth of semiconducting beta-FeSi2 thin films by facing targets direct-current sputtering", Appl. Phys. Lett., 88, 182104, 2006.06, [URL].
63. K. Takarabe, H. Doi, Y. Mori, K. Fukui, T. Yoshitake, K. Nagayama, "Enhanced optical absorption in nano crystalline FeSi2 and hydrogenation effect on its characteristic energy", Appl. Phys. Lett., 88, 061911, 2006.02.
64. T. Yoshitake, D. Nakagauchi, T. Ogawa, M. Itakura, N. Kuwano, Y. Tomokiyo, T. Kajiwara, and K. Nagayama, "Room-temperature epitaxial growth of ferromagnetic Fe3Si films on Si(111) by facing target direct-current sputtering", Appl. Phys. Lett., 86, 26, 86, 262505, 2005.09.
65. Tsuyoshi Yoshitake, Takeshi Hara, Tomohito Fukugawa, Ling yun Zhu, Masaru Itakura, Noriyuki Kuwano, Yoshitsugu Tomokiyo and Kunihito Nagayama, "Low-Temperature Growth of Nanocrystalline Diamond by Reactive Pulsed Laser Deposition under a Hydrogen Atmosphere", Jpn. J. Appl. Phys. Part2, 43, 2B, Vol. 43, pp. L 240–L 242, 2004.06.
66. T. Yoshitake, M. Yatabe, M. Itakura, N. Kuwano, Y. Tomokiyo, and K. Nagayama, "Semiconducting nanocrystalline iron disilicide thin films prepared by pulsed-laser ablation", Appl. Phys. Lett., 83, 15, Vol. 83, 3057-3059., 2003.10.
67. Tsuyoshi Yoshitake, Takashi Nishiyama and Kunihito Nagayama, "Homo-Growth of Diamond Single Phase Thin Films by Pulsed Laser Ablation of Graphite", Jpn. J. Appl. Phys. Part2, Vol.40, No.6A pp.L573 - L575., 2001.06.
68. Tsuyoshi Yoshitake, Gousuke Shiraishi, and Kunihito Nagayama, "Droplet-free thin films deposited by pulsed laser deposition using a mechanical filter", Jpn. J. Appl. Phys. Part1, Vol. 41, 836-837, 2001.02.
Presentations
1. Tsuyoshi Yoshitake, Widely-variable electrical conductivity of ultrananocrystalline diamond/hydrogenated amorphous carbon composite films prepared by PVD, 3rd French-Japanese Workshop on Diamond Power Devices, 2015.07.08.
2. Tsuyoshi Yoshitake, Preparation of Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films Prepared by Physical Vapor Deposition and Their Application to Photodiodes and Hard Coating, Hasselt Diamond Workshop 2015 SBDD XX, 2015.02.27.
3. Tsuyoshi Yoshitake, Yuki Katamune, Takanori Hanada, Satoshi takeichi, Shinya Ohmagari, Application of Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films to Photodiodes, Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014), 2014.12.09.
4. Tsuyoshi Yoshitake, Yuki Katamune, Takanori Hanada, Hiroki Gima, Abdelrahman M. Ahmed, Shinya Ohmagari, Sausan Al-Riyami, Kenji Hanada, Growth of UNCD/a-C:H composite films by PVD and their electrical conductivity control, Japan-France Workshop on Diamond Power Devices, 2014.10.06.
5. Tsuyoshi Yoshitake, Present state of research on photodiodes comprising iron disilicides and problems awaiting solution, International conference and summer school on advanced silicide technology 2014, 2014.07.19.
6. Tsuyoshi Yoshitake, Ecologically Friendly Semiconductors: Iron Disilicides and Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon, IUMRS-International Conference on Electronic Materials (IUMRS-ICEM 2012), 2012.09.26.
Membership in Academic Society
  • Japan Society of Applied Physics
  • 学内
Awards
  • 学内
  • 学外
  • 学内
Educational
Social
Professional and Outreach Activities
【Academic society】
Chief accountant, Symposium on SAGA Light Sources, 2006

Accountant chairman, Symposium on Silicide Semiconductor and Related Materials, IUMRS-ICAM2003 (The 8th IUMRS International Conference on Advanced Materials).
Member of the organization committee, Symposium on High-Speed Photographing and Photonics 2003.

Member of the organization committee, Symposium on High-Speed Photographing and Photonics 2001.
Member of the executive committee, Summer School on Silicide Semiconductors and Related Materials (2001).

Member of the executive committee, UK-Japan Workshop on Kankyo-Semiconductors (2000).
Manager of the symposium, 2000 Spring JSAP Annual Meeting.
Member of the executive committee, 2000 Laser Society Annual meeting.

Member of the executive committee, The 1st Symposium on Kankyo-Semiconductors (1999).

Member of the executive committee, Symposium on Optics (1996).

【The others】
Lecturer, the training institute organized by The Japan Cooperation agency (JICA) and Kyushu University (the year 2006).

Lecturer, the training institute organized by The Japan Cooperation agency (JICA) and Kyushu University (the year 2005).

Lecturer, the training institute organized by The Japan Cooperation agency (JICA) and Kyushu University (the year 2004).

Lecturer, the training institute organized by The Japan Cooperation agency (JICA) and Kyushu University (the year 2003).
Technical advisor, Kyushu TLO Company, Limited (the year 2000-2003)
Lecturer, the university xtension(the 2003)

Lecturer, the 48th technical institute organized by KASTEC (2002).
Lecturer, KASTEC Seminar (2002).