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Study on electret degradation mechanism toward extended reliability of vibrational energy harvester

Research Project

Project/Area Number 21H01271
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 20010:Mechanics and mechatronics-related
Research InstitutionThe University of Tokyo

Principal Investigator

TOSHIYOSHI Hiroshi  東京大学, 生産技術研究所, 教授 (50282603)

Co-Investigator(Kenkyū-buntansha) 橋口 原  静岡大学, 電子工学研究所, 教授 (70314903)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2023: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
KeywordsMEMS / 振動発電 / エナジーハーベスタ / エレクトレット
Outline of Research at the Start

本研究は、IoT無線センサ等の自立電源として有力視されているMEMS型環境振動発電の効率と信頼性を高める研究として、発電機能材料であるシリコン酸化膜由来のエレクトレット (永久電荷膜)の電荷密度が経時変化するメカニズムを分子動力学的手法で解明する。また、特性劣化を抑制する手段として、エレクトレット材料の表面保護膜による還元性ガス拡散 の防止や、エレクトレット膜中へのバリア層挿入によるシリコン基板側からのキャリア侵入抑制などの対策を施し、その効果を検証する。さらに、これらの知見と対策を活用して、65°Cで-1dB劣化までの時間が10年以上の高信頼性エレクトレット振動発電素子を実証する。

Outline of Final Research Achievements

This work is performed to improve the efficiency and the reliability of MEMS-type environmental vibrational energy harvesting that is considereed suitable as a power source for IoT-type wireless sensors. The specific action items include (1) analysis and elucidation of the aging deterioration of the electret charge density stored in silicon oxide, (2) development of measure to suppress the degradation of electret potential, such as application of barrier materials against reducing gases, and (3) device implementation of energy harvesters using the newly obtained knowledge to improve electret reliability.

Academic Significance and Societal Importance of the Research Achievements

IoT無線センサは、生産活動や商業活動のエビデンスベース意思決定に必要なデータを取得する技術として期待されており、クラウドコンピューティングの発達に支援されて多方面の分野で利用が進みつつある。しかしながら、その電源には従来の電池を使用することが多く、大量のセンサを必要とする次世代IoTではその電池交換のコストが問題視されている。これを解決する手段として、高信頼性のエナジーハーベスタが必要であり、本研究は振動発電型エナジーハーベスタの基盤材料であるエレクトレットの信頼性を高める基礎技術を研究開発した。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (10 results)

All 2023 2022

All Journal Article (3 results) Presentation (7 results) (of which Int'l Joint Research: 6 results)

  • [Journal Article] MEMS Electrostatic Energy Harvester Developed by Simultaneous Process for Anodic Bonding and Electret Charging2023

    • Author(s)
      Honma Hiroaki、Ikeno Sho、Toshiyoshi Hiroshi
    • Journal Title

      Sensors and Materials

      Volume: 35 Issue: 6 Pages: 1941

    • DOI

      10.18494/SAM4402

    • ISSN
      0914-4935, 2435-0869
    • Year and Date
      2023-06-27
    • Related Report
      2023 Annual Research Report
  • [Journal Article] Effect of hydrogen atoms on potassium-ion electrets used in vibration-powered generators2023

    • Author(s)
      Ohata Yoshiki、Araidai Masaaki、Ishiguro Takuma、Mitsuya Hiroyuki、Toshiyoshi Hiroshi、Shibata Yasushi、Hashiguchi Gen、Shiraishi Kenji
    • Journal Title

      Materials Science in Semiconductor Processing

      Volume: 157 Pages: 107306-107306

    • DOI

      10.1016/j.mssp.2022.107306

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
  • [Journal Article] Improvement of the reliability of potassium-ion electrets thorough an additional oxidation process2022

    • Author(s)
      Ohata Yoshiki、Nakanishi Toru、Chokawa Kenta、Araidai Masaaki、Ishiguro Takuma、Mitsuya Hiroyuki、Toshiyoshi Hiroshi、Shibata Yasushi、Hashiguchi Gen、Shiraishi Kenji
    • Journal Title

      Applied Physics Letters

      Volume: 121 Issue: 24 Pages: 243903-243903

    • DOI

      10.1063/5.0129247

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
  • [Presentation] Design and Test for MEMS Vibrational Energy Harvesters2023

    • Author(s)
      Hiroshi Toshiyoshi
    • Organizer
      35th International Conference on Microelectronic Test Structures (ICMTS)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Characterization of Resonance Sensor Integrated in MEMS Vibrational Energy Harvester2023

    • Author(s)
      Hiroaki Honma, Yuto Mizuno (Akai), and Hiroshi Toshiyoshi
    • Organizer
      Design, Test, Integration & Packaging of MEMS/MOEMS (DTIP 2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bandwidth Extension for MEMS Vibrational Energy Harvester using High-Voltage Electret2023

    • Author(s)
      Hiroaki Honma, Yukiya Tohyama, and Hiroshi Toshiyoshi
    • Organizer
      Design, Test, Integration & Packaging of MEMS/MOEMS (DTIP 2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of Gas Adsorption and Ions on the Reliability of Potassium-ion SiO2 Electret2022

    • Author(s)
      Refaldi Intri Dwi Putra, Takahiro Ozawa, Hiroaki Honma, Hiroshi Toshiyoshi, and Katsuyuki Fukutani,
    • Organizer
      22nd Int. Vacuum Congress (IVC-22)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MACHINE LEARNING-BASED EXPERIMENT PLANNING OF POTASSIUM-ION SiO2 ELECTRET FORMING2022

    • Author(s)
      Refaldi I.D. Putra, Hiroaki Honma, and Hiroshi Toshiyoshi
    • Organizer
      2022 JSME-IIP/ASME-ISPS Joint International Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)
    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of H2O and H2 gas to the Lifetime of Vacuum-annealed Potassium-doped SiO2 Electret for MEMS Vibrational Energy Harvester2022

    • Author(s)
      プトラ・レファルディ、小澤孝拓、本間浩章、福谷克之、年吉 洋
    • Organizer
      電気学会・第39回「センサ・マイクロマシンと応用システム」シンポジウム
    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
  • [Presentation] Effects of Gas Adsorption and Ions on the Reliability of Potassium-ion SiO2 Electret2022

    • Author(s)
      Refaldi Intri Dwi Putra, Takahiro Ozawa, Hiroaki Honma, Hiroshi Toshiyoshi, and Katsuyuki Fukutani
    • Organizer
      22nd Int. Vacuum Congress (IVC-22)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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