Ohsawa Takeo 大澤健男

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OHSAWA Takeo 大澤健男

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Researcher Number	00450289
Other IDs
Affiliation (Current)	2025: 国立研究開発法人物質・材料研究機構, 電子・光機能材料研究センター, 主幹研究員
Affiliation (based on the past Project Information) *help	2023: 国立研究開発法人物質・材料研究機構, 電子・光機能材料研究センター, 主幹研究員 2021 – 2022: 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主幹研究員 2016 – 2018: 国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 主任研究員 2010 – 2011: 東北大学, 原子分子材料科学高等研究機構, 助教
Review Section/Research Field	Principal Investigator Basic Section 26020:Inorganic materials and properties-related / Inorganic materials/Physical properties / Thin film/Surface and interfacial physical properties
Keywords	Principal Investigator エピタキシャル成長 / 光電子分光 / エピタキシャル薄膜 / 酸化物薄膜 / 薄膜 / 質量分析 / 電子物性 / 酸水素化物 / 酸化物エレクトロニクス / 表面・界面物性 … More / 走査型トンネル顕微鏡 / ホール効果 / 原子シート / 薄膜・表面界面物性 / ペロブスカイト型結晶 / 酸化物半導体 / パルスレーザー堆積法 / チタン酸ストロンチウム / ペロブスカイト結晶 / 表面・界面 / 走査プローブ顕微鏡 Less

Metal oxyhidride epitaxy and creation of fascinating electronic/dielectric propertiesPrincipal Investigator
- Principal Investigator
  
  OHSAWA Takeo
- Project Period (FY)
  2021 – 2023
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 26020:Inorganic materials and properties-related
- Research Institution
  National Institute for Materials Science
Investigation of fascinating conductivity at superstructure interfaces using oxide atomic sheetsPrincipal Investigator
- Principal Investigator
  
  Ohsawa Takeo
- Project Period (FY)
  2016 – 2018
- Research Category
  
  Grant-in-Aid for Young Scientists (A)
- Research Field
  
  Inorganic materials/Physical properties
- Research Institution
  National Institute for Materials Science
Low-dimensional Electronic Order Formed at Artificial Perovskite Titanate InterfacesPrincipal Investigator
- Principal Investigator
  
  OHSAWA Takeo
- Project Period (FY)
  2010 – 2011
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Thin film/Surface and interfacial physical properties
- Research Institution
  Tohoku University

All 2024 2023 2022 2021 2019 2018 2017 2016 2012 2011 2010 2009

All Journal Article Presentation Book

[Book] SPring-8/SACLA利用者情報2017
- Author(s)
  大澤健男、上田茂典、鈴木基寛、大橋直樹
- Total Pages
  5
- Publisher
  JASRI
- Data Source
  KAKENHI-PROJECT-16H06116
[Book] 表面科学2012
- Author(s)
  大澤健男、岩谷克也、清水亮太、一杉太郎
- Data Source
  KAKENHI-PROJECT-22760021
[Book] 日本結晶学会誌2011
- Author(s)
  岩谷克也, 大澤健男, 清水亮太, 一杉太郎
- Data Source
  KAKENHI-PROJECT-22760021
[Book] SrTiO_3ホモエピタキシャル薄膜成長初期過程の原子スケール観察2011
- Author(s)
  岩谷克也、大澤健男
- Publisher
  日本結晶学会誌
- Data Source
  KAKENHI-PROJECT-22760021
[Journal Article] Nanoscale dynamics of hydrogen in VO2 studied by μSR2024
- Author(s)
  Okabe H.、Hiraishi M.、Koda A.、Matsushita Y.、Ohsawa T.、Ohashi N.、Kadono R.
- Journal Title
  
  Physical Review Materials
  
  Volume: 8 Issue: 2
- DOI
  10.1103/physrevmaterials.8.024602
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-22K05275, KAKENHI-PLANNED-19H05819, KAKENHI-PROJECT-21H01629
[Journal Article] Full polarization reversal at room temperature in unsubstituted AlN2023
- Author(s)
  Hasegawa Kota、Shimizu Takao、Ohsawa Takeo、Sakaguchi Isao、Ohashi Naoki
- Journal Title
  
  Applied Physics Letters
  
  Volume: 123 Issue: 19 Pages: 192903-192903
- DOI
  10.1063/5.0174236
- Peer Reviewed
- Data Source
  KAKENHI-PUBLICLY-23H04124, KAKENHI-PROJECT-21H01629
[Journal Article] Local electronic structure of dilute hydrogen in β-Ga2O3 probed by muons2023
- Author(s)
  Hiraishi M., Okabe H., Koda A., Kadono R., Ohsawa T., Ohashi N., Ide K., Kamiya T., Hosono H.
- Journal Title
  
  Physical Review B
  
  Volume: 107 Issue: 4 Pages: 1-7
- DOI
  10.1103/physrevb.107.l041201
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22K05275, KAKENHI-PROJECT-21H01629
[Journal Article] Atomic-scale growth, imaging, spectroscopy, and electronic transport properties of metal-oxide films and interfaces2022
- Author(s)
  Ohsawa Takeo
- Journal Title
  
  Journal of Vacuum Science & Technology A
  
  Volume: 40 Issue: 1 Pages: 010806-010806
- DOI
  10.1116/6.0001469
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21H01629
[Journal Article] Electrical properties of zinc nitride and zinc tin nitride semiconductor thin films toward photovoltaic applications2022
- Author(s)
  Wang Yong、Ohsawa Takeo、Alnjiman Fahad、Pierson Jean-Francois、Ohashi Naoki
- Journal Title
  
  High Temperature Materials and Processes
  
  Volume: 41 Issue: 1 Pages: 343-352
- DOI
  10.1515/htmp-2022-0028
- Data Source
  KAKENHI-PROJECT-21H01629
[Journal Article] Investigation of Temperature-Dependent Hard X-ray Photoemission Spectra on Au/Nb:SrTiO3 Schottky Junctions2021
- Author(s)
  Ohsawa Takeo、Murakami Taisei、Hosaka Takumi、Ueda Shigenori、Ishigaki Takamasa、Ohashi Naoki
- Journal Title
  
  The Journal of Physical Chemistry C
  
  Volume: 125 Issue: 27 Pages: 14836-14842
- DOI
  10.1021/acs.jpcc.1c04022
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21H01629
[Journal Article] Ecofriendly Mg2Si-based photodiode for short-wavelength IR sensing2019
- Author(s)
  El-Amir Ahmed A.M.、Ohsawa Takeo、Nabatame Toshihide、Ohi Akihiko、Wada Yoshiki、Nakamura Masaru、Fu Xiuwei、Shimamura Kiyoshi、Ohashi Naoki
- Journal Title
  
  Materials Science in Semiconductor Processing
  
  Volume: 91 Pages: 222-229
- DOI
  10.1016/j.mssp.2018.11.033
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] IR photoresponse characteristics of Mg2Ge pn-junction photodiodes fabricated by rapid thermal annealing2019
- Author(s)
  El-Amir Ahmed A.M.、Ohsawa Takeo、Oshima Yuichi、Nakamura Masaru、Shimamura Kiyoshi、Ohashi Naoki
- Journal Title
  
  Journal of Alloys and Compounds
  
  Volume: 787 Pages: 578-584
- DOI
  10.1016/j.jallcom.2019.02.147
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Growth-Parameter Dependence of Polarity and Electronic Transports in ZnO Thin Films Deposited by Magnetron Sputtering2018
- Author(s)
  Ohsawa Takeo、Tsunoda Kei、Dierre Benjamin、Grachev Sergey、Montigaud Herve、Ishigaki Takamasa、Ohashi Naoki
- Journal Title
  
  physica status solidi (a)
  
  Volume: 215 Issue: 16 Pages: 1700838-1700838
- DOI
  10.1002/pssa.201700838
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Electronic Transport Properties Governed by Polarity Control through Tailoring of ZnO Bilayer Structures2018
- Author(s)
  Ohsawa Takeo、Tsunoda Kei、Yamagata Yoshihito、Dierre Benjamin、Grachev Sergey、Montigaud Herve、Ishigaki Takamasa、Ohashi Naoki
- Journal Title
  
  Crystal Growth & Design
  
  Volume: 18 Issue: 10 Pages: 5824-5831
- DOI
  10.1021/acs.cgd.8b00396
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Preparation and some properties of Mg2Si0.53Ge0.47 single crystal and Mg2Si0.53Ge0.47 pn-junction diode2018
- Author(s)
  El-Amir Ahmed A. M.、Ohsawa Takeo、Matsushita Yoshitaka、Wada Yoshiki、Shimamura Kiyoshi、Ohashi Naoki
- Journal Title
  
  AIP Advances
  
  Volume: 8 Issue: 11 Pages: 115005-115005
- DOI
  10.1063/1.5056221
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Impact of a surface TiO2 atomic sheet on the electronic transport properties of LaAlO3/SrTiO3 heterointerfaces2018
- Author(s)
  T. Ohsawa, M. Saito, R. Shimizu, K. Iwaya, S. Shiraki, Y. Ikuhara, and T. Hitosugi
- Journal Title
  
  Applied Physics Letters
  
  Volume: 113 Issue: 14 Pages: 141602-141602
- DOI
  10.1063/1.5046876
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18H03876, KAKENHI-PROJECT-16H06116, KAKENHI-PROJECT-16H03864
[Journal Article] Controlling the electrical conductivity of ternary wurtzite-type and metastable β-AgGaO2 by impurity doping2018
- Author(s)
  Nagatani Hiraku、Suzuki Issei、Takemura Sayuri、Ohsawa Takeo、Ohashi Naoki、Fujimoto Shinji、Omata Takahisa
- Journal Title
  
  AIP Advances
  
  Volume: 8 Issue: 8 Pages: 085203-085203
- DOI
  10.1063/1.5046361
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17H01315, KAKENHI-PROJECT-16H06116
[Journal Article] Atomic-scale visualization of oxide thin-film surfaces2018
- Author(s)
  Iwaya Katsuya、Ohsawa Takeo、Shimizu Ryota、Okada Yoshinori、Hitosugi Taro
- Journal Title
  
  Science and Technology of Advanced Materials
  
  Volume: 19 Issue: 1 Pages: 282-290
- DOI
  10.1080/14686996.2018.1442616
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-26246022, KAKENHI-PROJECT-16H06116, KAKENHI-PROJECT-18H03876
[Journal Article] Potential barrier formed at domain boundaries in twinned tetragonal BaTiO3 single crystals2017
- Author(s)
  Ohsawa Takeo、Hirose Sakyo、Ohashi Naoki
- Journal Title
  
  Applied Physics Letters
  
  Volume: 110 Issue: 1 Pages: 011604-011604
- DOI
  10.1063/1.4972849
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Crystalline polarity of ZnO thin films deposited under dc external bias on various substrates2017
- Author(s)
  Ohsawa Takeo、Tsunoda Kei、Dierre Benjamin、Zellhofer Caroline、Grachev Sergey、Montigaud Herve、Ishigaki Takamasa、Ohashi Naoki
- Journal Title
  
  Journal of Crystal Growth
  
  Volume: 463 Pages: 38-45
- DOI
  10.1016/j.jcrysgro.2017.01.048
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Metallic versus Semiconducting SWCNT Chemiresistors: A Case for Separated SWCNTs Wrapped by a Metallosupramolecular Polymer2017
- Author(s)
  Ishihara Shinsuke、O’Kelly Curtis J.、Tanaka Takeshi、Kataura Hiromichi、Labuta Jan、Shingaya Yoshitaka、Nakayama Tomonobu、Ohsawa Takeo、Nakanishi Takashi、Swager Timothy M.
- Journal Title
  
  ACS Applied Materials & Interfaces
  
  Volume: 9 Issue: 43 Pages: 38062-38067
- DOI
  10.1021/acsami.7b12992
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-25220602, KAKENHI-PROJECT-16H06116
[Journal Article] Simulation of crystal and electronic structures of octahedral molybdenum cluster complex compound Cs2[Mo6Cl14] using various DFT functionals2017
- Author(s)
 Saito Norio、Lemoine Pierric、Cordier Stephane、Ohsawa Takeo、Wada Yoshiki、Grasset Fabien、Cross Cross Jeffrey、Ohashi Naoki
- Journal Title
 
 J. Ceram. Soc. Japan
 
 Volume: 125 Issue: 10 Pages: 753-759
- DOI
 10.2109/jcersj2.17039
- NAID
 130006110748
- ISSN
 1348-6535, 1882-0743
- Language
 English
- Peer Reviewed
- Data Source
 KAKENHI-PROJECT-16H06116
[Journal Article] Solvent-mediated purification of hexa-molybdenum cluster halide, Cs2[Mo6Cl14] for enhanced optical properties2017
- Author(s)
  Saito Norio、Lemoine Pierric、Cordier Stephane、Wada Yoshiki、Ohsawa Takeo、Saito Noriko、Grasset Fabien、Cross Jeffrey Scott、Ohashi Naoki
- Journal Title
  
  CRYSTENGCOMM
  
  Volume: 19 Issue: 40 Pages: 6028-6038
- DOI
  10.1039/c7ce01440f
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Transparent tantalum cluster-based UV and IR blocking electrochromic devices2017
- Author(s)
  Renaud A.、Wilmet M.、Truong T. G.、Seze M.、Lemoine P.、Dumait N.、Chen W.、Saito N.、Ohsawa T.、Uchikoshi T.、Ohashi N.、Cordier S.、Grasset F.
- Journal Title
  
  Journal of Materials Chemistry C
  
  Volume: 5 Issue: 32 Pages: 8160-8168
- DOI
  10.1039/c7tc01964e
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16H06116, KAKENHI-PROJECT-17F17800
[Journal Article] Lattice and Valence Electronic Structures of Crystalline Octahedral Molybdenum Halide Clusters-Based Compounds, Cs2[Mo6X14] (X = Cl, Br, I), Studied by Density Functional Theory Calculations2017
- Author(s)
  Saito Norio、Cordier Stephane、Lemoine Pierric、Ohsawa Takeo、Wada Yoshiki、Grasset Fabien、Cross Jeffrey S.、Ohashi Naoki
- Journal Title
  
  Inorganic Chemistry
  
  Volume: 56 Issue: 11 Pages: 6234-6243
- DOI
  10.1021/acs.inorgchem.7b00265
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Negligible Sr segregation on SrTiO3 (001) √13 x √13 reconstructed surfaces2016
- Author(s)
  Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki and Taro Hitosugi
- Journal Title
  
  Appl. Phys. Lett.
  
  Volume: 108 Issue: 16 Pages: 161603-161603
- DOI
  10.1063/1.4947441
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-26246022, KAKENHI-PROJECT-16H06116, KAKENHI-PROJECT-16H03864
[Journal Article] Theoretical and experimental determination of the crystal structures of cesium?molybdenum chloride2016
- Author(s)
  Saito Norio、Wada Yoshiki、Lemoine Pierric、Cordier Stephane、Grasset Fabien、Ohsawa Takeo、Saito Noriko、Cross Jeffrey S.、Ohashi Naoki
- Journal Title
  
  Japanese Journal of Applied Physics
  
  Volume: 55 Issue: 7 Pages: 075502-075502
- DOI
  10.7567/jjap.55.075502
- NAID
  210000146761
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16H06116
[Journal Article] Isotope tracer investigation and ab-initio simulation of anisotropic hydrogen transport and possible multi-hydrogen centers in tin dioxide2016
- Author(s)
  K. Watanabe, I. Sakaguchi, M. Hashiguchi, N. Saito, E. Ross, H. Haneda, T. Ohsawa, N. Ohashi
- Journal Title
  
  Journal of Applied Physics
  
  Volume: 119 Issue: 22 Pages: 225704-225704
- DOI
  10.1063/1.4953387
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PUBLICLY-15H01053, KAKENHI-PROJECT-26420688, KAKENHI-PROJECT-16H06116
[Journal Article] Atomic-scale Visualization of Initial Growth of Homoepitaxial SrTiO_3 Thin Film on an Atomically Ordered Substrate2012
- Author(s)
  R.Shimizu, T.Ohsawa
- Journal Title
  
  ACS Nano
  
  Volume: 10 Issue: 10 Pages: 7967-7971
- DOI
  10.1021/nn202477n
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021, KAKENHI-PLANNED-23108004
[Journal Article] Atomic-scale visualization of initial growth of homoepitaxial SrTiO_3 thin film on an atomically ordered substrate2011
- Author(s)
  R. Shimizu, K. Iwaya, T. Ohsawa, S. Shiraki, T. Hasegawa, T. Hashizume and T. Hitosugi
- Journal Title
  
  ACS Nano
  
  Volume: 5 Pages: 7967-7971
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021
[Journal Article] Stripe charge ordering in SrO-terminated SrTiO_3(001)surfaces2011
- Author(s)
  K. Iwaya, R. Shimizu, T. Ohsawa, T. Hashizume, T. Hitosugi
- Journal Title
  
  Phys. Rev. B
  
  Volume: 83 Pages: 125117-125117
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021
[Journal Article] Simplified method to prepare atomically-ordered TiO_2(110)-(1×1) surfaces with steps and terraces2011
- Author(s)
  清水亮太、大澤健男
- Journal Title
  
  Appl.Surf.Sci.
  
  Volume: 257 Pages: 4867-4869
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021
[Journal Article] Stripe charge ordering in SrO-terminated SrTiO_3(001) surfaces2011
- Author(s)
  岩谷克也、大澤健男
- Journal Title
  
  Pbys.Rev.B
  
  Volume: 83
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021
[Journal Article] Atomically Resolved Surface Structure of SrTiO_3(001) Thin Films Grown in Step-Flow Mode by Pulsed Laser Deposition2010
- Author(s)
  岩谷克也、大澤健男
- Journal Title
  
  Appl.Phys.Express
  
  Volume: 3
- NAID
  10026495596
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021
[Journal Article] Thickness-dependent local surface electronic structures of homoepitaxial SrTiO_3 thin films2010
- Author(s)
  大澤健男
- Journal Title
  
  J.Appl.Phys.
  
  Volume: 108
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021
[Journal Article] Thickness-dependent local surface electronic structures of homoepitaxial SrTiO_3 thin films2010
- Author(s)
  T. Ohsawa, K. Iwaya, R. Shimizu, T. Hashizume, T. Hitosugi
- Journal Title
  
  J. Appl. Phys
  
  Volume: 108 Pages: 73710-73710
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021
[Journal Article] Atomically resolved surface structure of SrTiO_3(001)thin films grown in step-flow mode by pulsed laser deposition2010
- Author(s)
  K. Iwaya, T. Ohsawa, R. Shimizu, T. Hashizume, T. Hitosugi
- Journal Title
  
  Appl. Phys. Express
  
  Volume: 3 Pages: 75701-75701
- NAID
  10026495596
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Migration of nitrogen impurity in titanium dioxide and perovskite titanates2023
- Author(s)
  OHASHI, Naoki, SAKAGUCHI, Isao, SEGAWA, Hiroyo, OHSAWA, Takeo, MATSUI, Yoshio
- Organizer
  32nd International Conference on Defects in Semiconductors
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] Pt/Nb:SrTiO3ショットキー接合の巨大抵抗変化におけるPt電極への不純物効果と光電子分光評価2022
- Author(s)
  大澤健男, 上田茂典, 保井晃, 石垣隆正, 大橋直樹
- Organizer
  日本セラミックス協会第35回秋季シンポジウム
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] . Local electronic structure of dilute hydrogen in gallium oxide2022
- Author(s)
  Masatoshi HIRAISHI, Hirotaka OKABE, Akihiro KODA, Ryosuke KADONO, OHSAWA, Takeo, OHASHI, Naoki, Keisuke IDE, Toshio KAMIYA, HOSONO, Hideo
- Organizer
  15th International Conference on Muon Spin Rotation, Relaxation and Resonance. 2022
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] プラズマ支援MBE 法で作製したTiO2薄膜の水素化による絶縁体-金属伝導転移2022
- Author(s)
  大澤健男, 坂口勲, 大橋直樹
- Organizer
  日本セラミックス協会　2023年年会
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] Local Magnetism in the Spin-singlet State of VO22022
- Author(s)
  Hirotaka OKABE, Masatoshi HIRAISHI, Akihiro KODA, MATSUSHITA, Yoshitaka, OHSAWA, Takeo, OHASHI, Naoki, Ryosuke KADONO
- Organizer
  The 29th International Conference on Low Temperature Physics (LT29). 2022
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] Nb:SrTiO3基板上のエピタキシャル(Al,Sc)N薄膜における強誘電体特性2022
- Author(s)
  長谷川浩太, 清水荘雄, 陳君, 大澤健男, 坂口勲, 大橋直樹
- Organizer
  第69回応用物理学会春季学術講演会
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] Investigating Temperature Dependence of Resistive Switching and Photoemission Spectroscopy in Pt/Nb:SrTiO3 Heterojunctions2021
- Author(s)
  Takeo Ohsawa, Taisei Murakami, Shigenori Ueda, Takamasa Ishigaki, Naoki Ohashi
- Organizer
  Materials Research Meeting 2021
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] Pt/Nb:SrTiO3 ショットキー接合の抵抗スイッチングにおける Pt 電極への不純物添加効果2021
- Author(s)
  村上大晟、大澤健男、石垣隆正、大橋直樹
- Organizer
  第41回電子材料研究討論会
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] 単結晶(Al,Sc)N薄膜の合成と強誘電体特性評価2021
- Author(s)
  長谷川浩太、清水荘雄、大澤健男、坂口勲、大橋直樹
- Organizer
  第41回電子材料研究討論会
- Data Source
  KAKENHI-PROJECT-21H01629
[Presentation] ZnO/Ag 接合の加熱処理における界面電子状態の評価2018
- Author(s)
  山形栄人、大澤健男、保坂拓己、Herve Montigaud、石垣隆正、大橋直樹
- Organizer
  第66回応用物理学会春季学術講演会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] IR photoresponse characteristics of Mg2Si pn-junction diode fabricated by RTA2018
- Author(s)
  エルアミルアアハメドモハメドエルサイドアハメド、大澤健男、生田目俊秀、大井暁彦、和田芳樹、中村優、島村清史、大橋直樹
- Organizer
  第47回結晶成長国内会議
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Investigation on electronic Structure at metal/oxide interfaces2018
- Author(s)
  大橋直樹、廣瀬左京、大澤健男、上田茂典
- Organizer
  43RD INTERNATIONAL CONFERENCE AND EXPOSITION ON ADVANCED CERAMICS AND COMPOSITES
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Electrical properties of non-degenerate ZnSnN2 thin films grown by non-equilibrium deposition2018
- Author(s)
  Yong Wang, Takeo Ohsawa, Naoki Ohashi
- Organizer
  第66回応用物理学会春季学術講演会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] LaAlO3/SrTiO3界面の電子輸送特性におけるTiO2 表面原子シートの効果2018
- Author(s)
  大澤健男、白木將、清水亮太、一杉太郎
- Organizer
  日本セラミックス協会 2019年年会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Electrical and optical properties of Zn3N2 thin films2018
- Author(s)
  Yong Wang, Takeo Ohsawa, Naoki Ohashi
- Organizer
  第66回応用物理学会春季学術講演会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 角度制御型マグネトロンスパッタリング装置を用いた酸化亜鉛薄膜の作製と成膜条件の検討2018
- Author(s)
  保坂拓己、山形栄人、大澤健男、Sergey Grachev、Herve Montigaud、石垣隆正、大橋直樹
- Organizer
  第79回応用物理学会秋季学術講演会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] スパッタ粒子の入射角度に着目した酸化亜鉛薄膜成長とその評価2018
- Author(s)
  保坂拓己、山形栄人、大澤健男、Sergey Grachev、Herve Montigaud、石垣隆正、大橋直樹
- Organizer
  第38 回エレクトロセラミックス研究討論会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Ag/ZnO接合薄膜の加熱処理における界面電子状態評価2018
- Author(s)
  山形栄人、大澤健男、保坂拓己、Sergey Grachev、Herve Montigaud、石垣隆正、大橋直樹
- Organizer
  第57回セラミックス基礎科学討論会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] チタン酸ストロンチウムの欠陥と誘電特性に関するショットキー接合からの検討2018
- Author(s)
  大橋直樹、廣瀬左京、上田茂典、大澤健男
- Organizer
  第38 回エレクトロセラミックス研究討論会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 角度制御型マグネトロンスパッタリング装置を用いた酸化亜鉛薄膜の作製と成膜条件の検討2018
- Author(s)
  保坂拓己、山形栄人、大澤健男、Sergey Grachev、Herve Montigaud、石垣隆正、大橋直樹
- Organizer
  日本セラミックス協会第31回秋季シンポジウム
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 加熱処理によるZnO/Ag/ZnO薄膜の界面特性評価2018
- Author(s)
  山形栄人、大澤健男、保坂拓己、Sergey Grachev、Herve Montigaud、石垣隆正、大橋直樹
- Organizer
  第38 回エレクトロセラミックス研究討論会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] ドメインを導入したBaTiO3単結晶の異方的電気伝導性と局所電子状態2017
- Author(s)
  大澤　健男
- Organizer
  透明酸化物光・電子材料第166委員会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Impurities, Polarity, and Electronic Transport Properties of ZnO Crystals and Films2017
- Author(s)
  Takeo Ohsawa, Naoki Ohashi
- Organizer
  STAC-10
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Electronic States at Buried Metals/SrTiO3 Schottky Junctions Studied by HAXPES2017
- Author(s)
  Takeo Ohsawa, Sakyo Hirose, Shigenori Ueda, Naoki Ohashi
- Organizer
  7th International Conference on Hard X-Ray Photoelectron Spectroscopy
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 極性制御したZnO薄膜を用いたZnO/Si 接合の特性評価2017
- Author(s)
  大澤健男, 山形栄人, 石垣隆正, 大橋直樹
- Organizer
  第78回応用物理学会秋季学術講演会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 極性制御した酸化亜鉛薄膜の成長，電子状態および接合特性2017
- Author(s)
  山形栄人、大澤健男、Sergey Grachev、Herve Montigaud、石垣隆正、大橋直樹
- Organizer
  第37回エレクトロセラミックス研究討論会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Valence Band DOS of Wide-gap compounds Studied by HAXPES Utilizing Polarized X-ray and DFT simulations2017
- Author(s)
  Naoki Ohashi, Takeo Ohsawa, Shigenori Ueda
- Organizer
  7th International Conference on Hard X-Ray Photoelectron Spectroscopy
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Defect and hydrogen impurity in zinc oxide studied with various single crystals2017
- Author(s)
  Naoki Ohashi, Takeo Ohsawa, Isao Sakaguchi
- Organizer
  EMRS 2017 Fall meeting
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Impurities, Defects, and Electronic Transport Properties in Semiconducting ZnO Single Crystals2017
- Author(s)
  Takeo Ohsawa, Naoki Ohashi
- Organizer
  IUMRS-ICAM 2017
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 元素戦略の視点で見た酸化物中の欠陥・不純物の振る舞い2017
- Author(s)
  大橋直樹, 大澤健男, 坂口勲, 上田茂典.
- Organizer
  第55回セラミックス基礎科学討論会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Crystalline Polarity Control of ZnO Thin Films Grown Under External Electric Bias During Magnetron Sputtering2016
- Author(s)
  Takeo Ohsawa, Kei Tsunoda, Takamasa Ishigaki, Naoki Ohashi
- Organizer
  The 10th Asian Meeting on Electroceramics
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 偏光X 線を用いた放射光光電子分光2016
- Author(s)
  大橋直樹, 大澤健男, 上田茂典, 鈴木基寛, ウィリアムズジェシーロバート, 館山佳尚
- Organizer
  文部科学省元素戦略プロジェクト＜研究拠点形成型＞/大型研究施設
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 放射光光電子分光による金属・半導体界面の解析2016
- Author(s)
  大橋直樹, 廣瀬左京, 上田茂典, 大澤健男, 坂口勲, 安藤陽, 大串秀世
- Organizer
  文部科学省元素戦略プロジェクト＜研究拠点形成型＞/大型研究施設
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] 水素を添加したZnO単結晶の欠陥と電気特性2016
- Author(s)
  大澤健男, 坂口勲, 上田茂典, 大橋直樹.
- Organizer
  第63回応用物理学会春季学術講演会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] TiO2(110)表面のsub-surface Tiサイトにおける余剰電子の強い局在化2016
- Author(s)
  神坂英幸, 清水亮太, 岩谷　克也, 大澤健男, 白木将, 長谷川哲也, 一杉太郎
- Organizer
  第10回分子科学討論会
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Negligible Sr segregation on SrTiO3(001)-(√13×√13)-R33.7° reconstructed surfaces2016
- Author(s)
  Takeo Ohsawa, Ryota Shimizu, Katsuya Iwaya, Susumu Shiraki, Taro Hitosugi
- Organizer
  MRS Fall Meeting & Exhibit. 2016
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16H06116
[Presentation] Atomic-scale Imaging of Sub-monolayer Thin-Film Growth Chemistry on SrTiO_3(001)-(√<13>×√<13>) Surfaces2012
- Author(s)
 T.Ohsawa
- Organizer
 The 2012 WPI-AIMR Annual Workshop
- Place of Presentation
 Sendai, Japan
- Data Source
 KAKENHI-PROJECT-22760021
[Presentation] SrTiO_3(001)-(√<13>×√<13>)基板表面のSTM/XPS2012
- Author(s)
 大澤健男
- Organizer
 応用物理学会
- Place of Presentation
 早稲田大学
- Data Source
 KAKENHI-PROJECT-22760021
[Presentation] SrTiO_3(001))基板表面再構成に及ぼす酸素欠損の寄与2012
- Author(s)
  清水亮太、大澤健男
- Organizer
  応用物理学会
- Place of Presentation
  早稲田大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] SrTiO_3(001)-(√13×√13)基板表面のSTM/XPS2012
- Author(s)
  大澤健男、清水亮太、岩谷克也、白木将、一杉太郎
- Organizer
  第59回応用物理学関係連合講演会
- Place of Presentation
  早稲田大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Spatially resolved Nano-scale characterization of electronic states in SrTiO_3(001)surfaces by STM/STS2012
- Author(s)
  K. Iwaya, T. Ohsawa
- Organizer
  APS March Meeting
- Place of Presentation
  USA
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Spatially Resolved Nano-Scale Characterization of Electronic States in SrTiO_3(001) Surfaces by STM/STS2012
- Author(s)
  K.Iwaya, T.Ohsawa
- Organizer
  American Physics Society
- Place of Presentation
  Boston, USA
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Effect of Oxygen Deficiency on SrTiO_3(001) Surface Reconstruction2012
- Author(s)
  R.Shimizu, T.Ohsawa
- Organizer
  The 2012 WPI-AIMR Annual Workshop
- Place of Presentation
  Sendai, Japan
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] SrTiO_3(001)表面再構成に及ぼす酸素欠損の寄与2012
- Author(s)
  清水亮太、岩谷克也、大澤健男、白木将、一杉太郎
- Organizer
  第59回応用物理学関係連合講演会
- Place of Presentation
  日早稲田大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] SrTiO_3(001)-(√13x√13)エピタキシャル基板表面の構造解析2011
- Author(s)
  清水亮太、濱田幾太郎、赤木和人、岩谷克也、大澤健男、白木將、長谷川哲也、塚田捷、一杉太郎
- Organizer
  第72回応用物理学学術講演会
- Place of Presentation
  山形大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] SrO終端SrTiO_3(001)基板表面の電子状態2011
- Author(s)
  大澤健男、岩谷克也、清水亮太、橋詰富博、一杉太郎
- Organizer
  第58回応用物理学関係連合講演会
- Place of Presentation
  神奈川工科大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] エピタキシャル成長用SrTiO_3(001)・(√<13>×√<13>)基板表面の構造解析2011
- Author(s)
 清水亮太、大澤健男
- Organizer
 応用物理学会
- Place of Presentation
 山形大学
- Data Source
 KAKENHI-PROJECT-22760021
[Presentation] Atomically-Resolved Electronic States of TiO2-and SrO-terminated Surfaces of SrTiO_32011
- Author(s)
  K. Iwaya, T. Ohsawa, R. Shimizu, T. Hashizume, T. Hitosugi
- Organizer
  The 2011 WPI-AIMR Annual Workshop
- Place of Presentation
  Japan
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] SrO層堆積により誘起されるSrTiO_3(001)基板表面の酸素欠損2011
- Author(s)
  大澤健男、岩谷克也、清水亮太、一杉太郎
- Organizer
  第72回応用物理学学術講演会
- Place of Presentation
  山形大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] SrTiO_3(001)-(√13x√13)基板表面上におけるホモエピタキシャル成長初期過程の原子スケール観察2011
- Author(s)
  清水亮太、岩谷克也、大澤健男、白木将、長谷川哲也、橋詰富博、一杉太郎
- Organizer
  第58回応用物理学関係連合講演会
- Place of Presentation
  神奈川工科大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] STM/STSによるTiO_2終端SrTiO_3(001)表面の局所電子状態の観察2011
- Author(s)
  岩谷克也、大澤健男、清水亮太、一杉太郎
- Organizer
  日本物理学会2011年秋季大会
- Place of Presentation
  富山大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] STM/STSによるSrO終端SrTiO_3(001)表面の局所電子状態の観察2011
- Author(s)
  岩谷克也, 大澤健男, 清水亮太, 一杉太郎
- Organizer
  日本物理学会2011年秋季大会
- Place of Presentation
  富山大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Atomic-scale Imaging of Sub-monolayer Thin Film Growth Process on SrTiO_3(001)-(√13×√13)Surfaces2011
- Author(s)
  T. Ohsawa, K. Iwaya, R. Shimizu, T. Hitosugi
- Organizer
  International Symposium on Surface Science (ISSS-6)
- Place of Presentation
  Japan
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] STM/STSによるTiO_2終端SrTiO_3(001)表面の局所電子状態の観察2011
- Author(s)
  岩谷克也、大澤健男
- Organizer
  物理学会
- Place of Presentation
  富山大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] SrO層堆積により誘起されるSrTiO_3(001)基板表面の酸素欠損2011
- Author(s)
  大澤健男
- Organizer
  応用物理学会
- Place of Presentation
  山形大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Atomic-scale Imaging of Sub-monolayer Thin Film Growth Process on SrTiO3-(√<13>×√<13>) Surfaces2011
- Author(s)
 T.Ohsawa
- Organizer
 International Symposium on Surface Science
- Place of Presentation
 Tokyo, Japan
- Data Source
 KAKENHI-PROJECT-22760021
[Presentation] Atomic-scale observation of initial growth process of homoepitaxial SrTiO_3 on atomically-controlled SrTiO_3(001)substrate surfaces2011
- Author(s)
  R. Shimizu, K. Iwaya, T. Ohsawa, S. Shiraki, T. Hasegawa, T. Hashizume, T. Hitosugi
- Organizer
  The 2011 WPI-AIMR Annual Workshop
- Place of Presentation
  Japan
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] STM/STSによるSrO終端SrTiO_3(001)表面の局所電子状態の観察2011
- Author(s)
  岩谷克也、大澤健男
- Organizer
  物理学会
- Place of Presentation
  富山大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Investigation of Single-Crystal and Thin Film Surfaces of SrTiO_3 using Low-temperature STM/STS2010
- Author(s)
  大澤健男
- Organizer
  2010 MRS Fall Meeting
- Place of Presentation
  Hynes Convention Center(アメリカ合衆国)
- Year and Date
  2010-12-02
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Thickness Dependence of Local Surface Electronic Structures in SrTiO_3 Probed by Scanning Tunneling Microscopy2010
- Author(s)
  T. Ohsawa, K. Iwaya, R. Shimizu, T. Hashizume, T. Hitosugi
- Organizer
  7th International Conference on Inorganic Materials
- Place of Presentation
  France
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Atomically-ordered (√13×√13)SrTiO_3(001)substrate surfac for epitaxial growth2010
- Author(s)
  R. Shimizu, T. Ohsawa, K. Iwaya, T. Hasegawa, T. Hashizume, and T. Hitosugi
- Organizer
  17th International Workshop on Oxide Electronics
- Place of Presentation
  Japan
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Investigation of Single-Crystal and Thin Film Surfaces of SrTiO_3 using Low-temperature STM/STS2010
- Author(s)
  T. Hitosugi, K. Iwaya, T. Ohsawa, R. Shimizu, T. Hashizume
- Organizer
  2010 MRS Fall Meeting
- Place of Presentation
  USA
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Thickness-dependent Local Surface Electronic Structures of Homoepitaxial SrTiO_3 Thin Films2010
- Author(s)
  大澤健男
- Organizer
  17th International Workshop on Oxide Electronics
- Place of Presentation
  淡路夢舞台国際会議場(兵庫)
- Year and Date
  2010-09-21
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Investigation of Single-Crystal and Thin Film Surfaces of SrTiO_3 using Low-temperature STM/STS2010
- Author(s)
  T. Ohsawa, K. Iwaya, R. Shimizu, T. Hashizume, T. Hitosugi
- Organizer
  SSSJ-A3 Foresight Joint Symposium on Nanomaterials and Nanostructures
- Place of Presentation
  Japan
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] SrTiO_3(001)-(√13×√13)エピタキシャル成長基板表面の作製2010
- Author(s)
  清水亮太, 大澤健男, 岩谷克也, 長谷川哲也, 橋詰富博, 一杉太郎
- Organizer
  2010年秋季第71回応用物理学会学術講演会
- Place of Presentation
  長崎大学
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Atomically-ordered (√13×√13) SrTiO_3(001) Substrate Surface for Epitaxial Growth2010
- Author(s)
  大澤健男
- Organizer
  17th International Workshop on Oxide Electronics
- Place of Presentation
  淡路夢舞台国際会議場(兵庫)
- Year and Date
  2010-09-20
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Investigation of an atomically-ordered SrTiO_3(001)-(√13×√13)step/terrace substrate2010
- Author(s)
  R. Shimizu, K. Iwaya, T. Ohsawa, T. Hasegawa, T. Hashizume, T. Hitosugi
- Organizer
  SSSJ-A3 Foresight Joint Symposium on Nanomaterials and Nanostructures
- Place of Presentation
  Japan
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Thickness-dependent Local Surface Electronic Structures of Homoepitaxial SrTiO_3 Thin Films2010
- Author(s)
  T. Ohsawa, K. Iwaya, R. Shimizu, T. Hashizume, T. Hitosugi
- Organizer
  17th International Workshop on Oxide Electronics
- Place of Presentation
  Japan
- Data Source
  KAKENHI-PROJECT-22760021
[Presentation] Thickness Dependence of Local Surface Electronic Structures in SrTiO_3 Probed by Scanning Tunneling Microscopy2010
- Author(s)
 大澤健男
- Organizer
 7^<th> International Conference on Inorganic Materials
- Place of Presentation
 Bellevue Centre(フランス)
- Year and Date
 2010-09-12
- Data Source
 KAKENHI-PROJECT-22760021
[Presentation] SrTiO_3(001)-(√13×√13)再構成表面の作製と評価2009
- Author(s)
  清水亮太、岩谷克也、大澤健男、長谷川哲也、橋詰富博、一杉太郎
- Organizer
  日本物理学会秋季大会
- Place of Presentation
  大阪府立大学
- Data Source
  KAKENHI-PROJECT-22760021

1. SHIRAKI Susumu

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
2. 一杉太郎

# of Collaborated Projects: 0 results

# of Collaborated Products: 3 results
3. 清水亮太

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
4. 田中丈士

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
5. 片浦弘道

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
6. 小俣孝久

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
7. 鈴木一誓

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
8. 岡田佳憲

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
9. 清水荘雄

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
10. 平石雅俊

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results

Ohsawa Takeo 大澤 健男

OHSAWA Takeo 大澤 健男

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Co-Researchers

Metal oxyhidride epitaxy and creation of fascinating electronic/dielectric propertiesPrincipal Investigator

Principal Investigator

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Investigation of fascinating conductivity at superstructure interfaces using oxide atomic sheetsPrincipal Investigator

Principal Investigator

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Low-dimensional Electronic Order Formed at Artificial Perovskite Titanate InterfacesPrincipal Investigator

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[Book] SPring-8/SACLA利用者情報2017

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[Book] 表面科学2012

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[Book] 日本結晶学会誌2011

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[Book] SrTiO_3ホモエピタキシャル薄膜成長初期過程の原子スケール観察2011

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[Journal Article] Nanoscale dynamics of hydrogen in VO2 studied by μSR2024

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[Journal Article] Full polarization reversal at room temperature in unsubstituted AlN2023

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[Journal Article] Local electronic structure of dilute hydrogen in β-Ga2O3 probed by muons2023

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[Journal Article] Atomic-scale growth, imaging, spectroscopy, and electronic transport properties of metal-oxide films and interfaces2022

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[Journal Article] Electrical properties of zinc nitride and zinc tin nitride semiconductor thin films toward photovoltaic applications2022

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[Journal Article] Investigation of Temperature-Dependent Hard X-ray Photoemission Spectra on Au/Nb:SrTiO3 Schottky Junctions2021

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[Journal Article] Ecofriendly Mg2Si-based photodiode for short-wavelength IR sensing2019

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[Journal Article] IR photoresponse characteristics of Mg2Ge pn-junction photodiodes fabricated by rapid thermal annealing2019

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[Journal Article] Growth-Parameter Dependence of Polarity and Electronic Transports in ZnO Thin Films Deposited by Magnetron Sputtering2018

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Ohsawa Takeo 大澤健男

OHSAWA Takeo 大澤健男