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TEM operand and first principles analysis of mechanisms of time-dependent oxide memristor properties

Research Project

Project/Area Number 19K04468
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 21050:Electric and electronic materials-related
Research InstitutionOsaka University

Principal Investigator

Tohei Tetsuya  大阪大学, 基礎工学研究科, 准教授 (00463878)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords酸化物メモリスタ / 透過型電子顕微鏡その場観察 / 酸化チタン / 第一原理計算 / 抵抗変化現象 / 人工シナプス / 酸化物半導体 / 透過型電子顕微鏡 / 電子顕微鏡その場観察 / ルチル型TiO2 / 点欠陥 / 酸化物 / TEMその場観察
Outline of Research at the Start

時間に依存した新奇なメモリスタ特性(電圧印加により誘起される不揮発的な電気抵抗変化)を示す金属酸化物(SrTiO3,TiO2)ベースの抵抗変化材料に関して、電気特性評価、高分解能その場透過型電子顕微鏡観察、第一原理理論計算を連携した解析を行う。実験および理論的解析により得られた緩和型メモリスタ特性の微視的メカニズム(原子欠陥の移動・集散に伴う局所状態変化)の知見から、多様で動的なシナプス様特性を示すメモリスタの制御と設計につながる指針を獲得する。

Outline of Final Research Achievements

Oxide based memristors with time-dependent resistive change properties were studied by TEM operand experiments and theoretical calculations. By performing high resolution electron microscopy under voltage biasing conditions, we observed dynamic behavior of microstructural change in the resistive change devices at nanometer scale. We have discussed resistive change mechanisms based on oxygen vacancy behaviors. We also implemented time-dependent synaptic properties and associative learning by using multi-terminal memristive devices.

Academic Significance and Societal Importance of the Research Achievements

本研究の電子顕微鏡観察にもとづく解析の結果から,抵抗変化(メモリスタ)素子の特性発現の鍵となる動的な微細構造変化の詳細が明らかになった.これらの知見は,未だ不明な点が多いメモリスタ素子の動作機構の理解を深めるとともに,メモリスタの挙動をより微細な時空間スケールで制御するための指針になると考えられる.これにより,抵抗変化現象にもとづく高効率・高機能な新規不揮発メモリおよび人工シナプス素子の開発に役立つと期待される.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (32 results)

All 2022 2021 2020 2019 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (25 results) (of which Int'l Joint Research: 9 results,  Invited: 3 results) Remarks (3 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Versatile Functionality of Four-Terminal TiO2-x Memristive Devices as Artificial Synapses for Neuromorphic Computing2022

    • Author(s)
      Ryotaro Miyake, Zenya Nagata, Kenta Adachi, Yusuke Hayashi, Tetsuya Tohei, Akira Sakai
    • Journal Title

      ACS Applied Electronic Materials

      Volume: - Issue: 5 Pages: 2326-2336

    • DOI

      10.1021/acsaelm.2c00161

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Fabrication of GaOx based crossbar array memristive devices and their resistive switching properties2020

    • Author(s)
      M. Joko, Y. Hayashi, T. Tohei, A. Sakai
    • Journal Title

      Jpn. J. Appl. Phys.

      Volume: 59 Issue: SM Pages: SMMC03-SMMC03

    • DOI

      10.35848/1347-4065/ab8be6

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Gate Tuning of Synaptic Functions Based on Oxygen Vacancy Distribution Control in Four-Terminal TiO2-x Memristive Devices2019

    • Author(s)
      Z. Nagata, T. Shimizu, T. Isaka, T. Tohei*, N. Ikarashi, A. Sakai*
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1

    • DOI

      10.1038/s41598-019-46192-x

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 平面型TiO2-xメモリスタ素子における抵抗変化領域のその場TEM観察2022

    • Author(s)
      谷口奈穂、藤平哲也、林侑介、酒井朗
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] GaOxメモリスタの抵抗スイッチング特性評価2022

    • Author(s)
      佐藤健人、林侑介、藤平哲也、酒井朗
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] アモルファスGaOxを用いたクロスバーアレイメモリスタの抵抗変化特性2022

    • Author(s)
      正岡直樹, 林侑介, 藤平哲也, 酒井朗
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 平面型微細TiO2-xメモリスタ素子における抵抗変化領域のその場TEM観察2021

    • Author(s)
      谷口奈穂、藤平哲也、林侑介、酒井朗
    • Organizer
      日本顕微鏡学会第77回学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Heterosynaptic Property Demonstrated with Planar Four-Terminal Amorphous GaOx Memristive Devices2021

    • Author(s)
      T. Ikeuchi, Y. Hayashi, T. Tohei, A. Sakai
    • Organizer
      2021 International Conference on Solid State Devices and Materials (SSDM2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Crystalline microstructure and electric property of rutile TiO2 single crystal memristor2021

    • Author(s)
      T. Tohei, N. Taniguchi, T. Isaka, R. Miyake, M. Joko, Y. Hayashi, N. Ikarashi, A. Sakai
    • Organizer
      International Conference on Materials and Systems for Sustainability 2021 (ICMaSS2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Pavlovian conditioning implemented in four-terminal TiO2-x memristive devices2021

    • Author(s)
      R. Miyake, K. Adachi, Y. Hayashi, T. Tohei, A. Sakai
    • Organizer
      4th International Conference on Memristive Materials, Devices & Systems (MEMRISYS 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Habituation and sensitization properties mimicked in four-terminal TiO2-x memristive devices2021

    • Author(s)
      K. Adachi, Y. Hayashi, T. Tohei, A. Sakai
    • Organizer
      4th International Conference on Memristive Materials, Devices & Systems (MEMRISYS 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Temperature-Dependent Resistive Switching Properties of GaOx Memristors up to 600 K2021

    • Author(s)
      K. Sato, Y. Hayashi, T. Tohei, A. Sakai
    • Organizer
      2021 International Workshop on Dielectric Thin Films for future electron devices (IWDTF2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 第一原理計算手法に基づく外部電場下におけるルチル型TiO2中の酸素空孔挙動の解析2021

    • Author(s)
      二宮 雅輝、藤平 哲也、林 侑介、酒井 朗
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 酸化物四端子型メモリスタの結晶微細構造と電気特性2021

    • Author(s)
      藤平哲也,三宅亮太郎,谷口奈穂,上甲守治,林侑介,酒井朗
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] ルチル型TiO2-x平面型メモリスタ素子における抵抗変化領域のその場TEM観察2021

    • Author(s)
      谷口奈穂,藤平哲也,上甲守治,林侑介,酒井朗
    • Organizer
      応用物理学会関西支部2020年度第1回+第2回合同講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 4端子平面型TiO2-xメモリスタ素子におけるゲート制御に基づくシナプス特性の変調2021

    • Author(s)
      安達健太,林侑介,藤平哲也,酒井朗
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 4端子平面型アモルファスGaOxメモリスタ素子の開発と抵抗変化特性評価2021

    • Author(s)
      池内太志,林侑介,藤平哲也,酒井朗
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] アモルファス酸化ガリウムを用いたメモリスタの抵抗変化特性およびシナプス特性2020

    • Author(s)
      上甲守治, 池内太志, 林侑介, 藤平哲也, 酒井朗
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 4端子平面型TiO2-x メモリスタ素子における酸素空孔分布2次元制御に基づくSTP・LTP特性の実装2020

    • Author(s)
      安達健太, 酒井朗, 藤平哲也, 林侑介, 三宅亮太郎
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 複合顕微鏡アプローチによる機能性結晶のマルチスケール構造・物性解析2020

    • Author(s)
      藤平哲也
    • Organizer
      令和2年日本材料学会半導体エレクトロニクス部門委員会第1回特別研究会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 第一原理計算による外部電場下におけるルチル型TiO2中の酸素空孔挙動解析2020

    • Author(s)
      井阪健,藤平哲也,林侑介, 酒井朗
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 4端子平面型TiO2-xメモリスタ素子におけるドナーイオン分布2次元制御に基づくパブロフ型条件付けの実装2020

    • Author(s)
      三宅亮太郎,林侑介, 藤平哲也,酒井朗
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Electric and Microstructural Analysis of Rutile TiO2 Single Crystal Memristors2019

    • Author(s)
      T. Tohei
    • Organizer
      Joint 5th International Symposium on Frontiers in Materials Science & 3rd International Symposium on Nano-materials, Technology and Applications (FMS-NANOMATA 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Fabrication of GaOx Based Crossbar Array Memristive Devices and Their Resistive Switching Properties2019

    • Author(s)
      M. Joko, Y. Hayashi, T. Tohei, A. Sakai
    • Organizer
      2019 International Workshop on Dielectric Thin Films for Future Electron Devices: Science and Technology (IWDTF2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Atomic and electronic structure analysis of resistive switching regions in rutile TiO2-x based four-terminal memristive devices2019

    • Author(s)
      T. Isaka, T. Tohei, T. Shimizu, S. Takeuchi, N. Ikarashi, A. Sakai
    • Organizer
      International Conference on Materials and Systems for Sustainability 2019 (ICMaSS2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Oxygen vacancy distribution control for resistive switching of epitaxial TiO2-x thin films in four-terminal memristive devices2019

    • Author(s)
      R. Miyake, Z. Nagata, T. Tohei, and A. Sakai
    • Organizer
      2019 International Conference on Solid State Devices and Materials (SSDM2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] GaOxを用いたクロスバーアレイメモリスタの開発と抵抗変化特性2019

    • Author(s)
      上甲守治,林侑介, 藤平哲也, 酒井朗
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 4端子TiO2-x薄膜メモリスタ素子によるシナプス特性の実装2019

    • Author(s)
      三宅亮太郎,林侑介, 藤平哲也,酒井朗
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Research-status Report
  • [Remarks] ResearchGate Tetsuya Tohei personal page

    • URL

      https://www.researchgate.net/profile/Tetsuya-Tohei

    • Related Report
      2021 Annual Research Report
  • [Remarks] https://www.researchgate.net/profile/Tetsuya-Tohei

    • Related Report
      2020 Research-status Report
  • [Remarks] Researchgate Tohei's personal page

    • URL

      https://www.researchgate.net/profile/Tetsuya_Tohei

    • Related Report
      2019 Research-status Report
  • [Patent(Industrial Property Rights)] メモリスタおよびそれを備えたアレイシステム2019

    • Inventor(s)
      林侑介,藤平哲也,酒井朗
    • Industrial Property Rights Holder
      林侑介,藤平哲也,酒井朗
    • Industrial Property Rights Type
      特許
    • Filing Date
      2019
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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