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Development of highly heat-conductive and low stiffness joint utilizing anisotropic microcomposite structure

Research Project

Project/Area Number 22K20480
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0401:Materials engineering, chemical engineering, and related fields
Research InstitutionOsaka University

Principal Investigator

Tatsumi Hiroaki  大阪大学, 接合科学研究所, 講師 (00961757)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsエレクトロニクス実装 / はんだ / ポーラス材料 / 熱伝導性 / 接合 / ロータス型ポーラス銅 / 半導体実装 / 複合材 / 剛性
Outline of Research at the Start

電力制御用パワー半導体に対して、大電流に対応するための高電流密度化の要求が高まっている。そのため、パワー半導体内部の半導体チップと回路基板をつなぐ接合部には、熱を逃がす高熱伝導性と熱ひずみを緩和する低剛性の両立が求められている。
本研究計画は、接合部の内部に異方的な微細複合構造を創出することによって、狙った特性を狙った方向に発現させる新規接合プロセスの提案と、微細複合構造の設計指針を得ることを目的とする。具体的には、一方向性貫通孔を有するポーラスCuとSn基はんだを複合化する接合プロセスの開発と、得られた構造が熱的・機械的特性に及ぼす影響を明らかにする。

Outline of Final Research Achievements

The microscale composite structure within the bonding layer was evaluated for its excellent thermal conductivity and high-temperature stability. In particular, we aimed to develop a bonding process and demonstrate the performance of a joint with an anisotropic composite structure in which highly thermally conductive materials are oriented in the direction of heat transfer.
Thermal conductivity was measured and high-temperature stability was evaluated for the joints obtained by molten solder infiltering into the unidirectionally oriented pores of a lotus-type porous Cu (Lotus Cu) sheet. The results showed that the Lotus Cu/solder composite joints exhibited excellent thermal conductivity and stable joint strength at 200 °C. It was also shown that the anisotropic composite structure of the joints is effective in controlling their properties, and it is expected that this approach will contribute to the enhancement of the functionality of the joints in semiconductor devices.

Academic Significance and Societal Importance of the Research Achievements

半導体デバイスの高電流密度化と高性能化に際して求められる接合部の高熱伝導性と高温安定性を実現する手法として、高熱伝導材料を伝熱方向に配向させた異方的な複合構造の接合部を創出することの有効性を実証することができた。これは、近年の半導体デバイスの急速な発展を支える重要な接合技術として社会的に大きな貢献を果たすだけでなく、従来の金属組織制御では実現できない特性の大幅な改善が期待される新しい接合部の特性制御方法として学術的にも大きな意義がある。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (12 results)

All 2024 2023 2022 Other

All Journal Article (1 results) Presentation (5 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results) Remarks (2 results) Patent(Industrial Property Rights) (4 results) (of which Overseas: 2 results)

  • [Journal Article] Anisotropic highly conductive joints utilizing Cu-solder microcomposite structure for high-temperature electronics packaging2022

    • Author(s)
      Tatsumi Hiroaki、Nishikawa Hiroshi
    • Journal Title

      Materials & Design

      Volume: 223 Pages: 111204-111204

    • DOI

      10.1016/j.matdes.2022.111204

    • Related Report
      2022 Research-status Report
  • [Presentation] Low Thermal Resistance Joint using Lotus-type Cu/Solder Composite2024

    • Author(s)
      Hiroaki Tatsumi, Hiroshi Isono, Kana Hirase, Takuya Ide, Hiroshi Nishikawa
    • Organizer
      2024 International Conference on Electronics Packaging (ICEP2024)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ロータス型ポーラス銅・はんだ複合構造を活用した高放熱モジュールの試作評価2024

    • Author(s)
      巽 裕章,磯野 浩,平瀬 加奈,井手 拓哉,西川 宏
    • Organizer
      第30回エレクトロニクスにおけるマイクロ接合・実装技術シンポジウム(Mate2024)
    • Related Report
      2023 Annual Research Report
  • [Presentation] Enhanced Thermal Conductivity in Micro Composite Structure Joints Utilizing Porous Cu Sheets2023

    • Author(s)
      Hiroaki Tatsumi, Hiroshi Nishikawa
    • Organizer
      The 5th International Conference on Nanojoining and Microjoining (NMJ 2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-Thermal-Performance Power Semiconductor Module using Solder/Copper Composite Joints2023

    • Author(s)
      Hiroaki Tatsumi
    • Organizer
      The 3rd International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJI2MA-3)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Thermal and Mechanical Evaluation of Anisotropic Cu-Solder Composite Joint on High Temperature Storage2022

    • Author(s)
      Tatsumi Hiroaki、Nishikawa Hiroshi
    • Organizer
      TMS2023 152nd Annual Meeting Exhibition
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Remarks] 個人HP

    • URL

      https://hiroakitatsumi.com/

    • Related Report
      2023 Annual Research Report
  • [Remarks] 研究者HP

    • URL

      https://hiroakitatsumi.com/

    • Related Report
      2022 Research-status Report
  • [Patent(Industrial Property Rights)] 熱界面構造及び該熱界面構造の形成方法2023

    • Inventor(s)
      巽裕章,井手拓哉,村上政明,沼田富行
    • Industrial Property Rights Holder
      巽裕章,井手拓哉,村上政明,沼田富行
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2023-066481
    • Filing Date
      2023
    • Related Report
      2023 Annual Research Report
  • [Patent(Industrial Property Rights)] 熱伝導接合構造、熱伝導接合方法、該熱伝導接合構造を有するヒートシンク、並びに該熱伝導接合構造を有する半導体装置2023

    • Inventor(s)
      巽裕章,井手拓哉,村上政明,沼田富行
    • Industrial Property Rights Holder
      巽裕章,井手拓哉,村上政明,沼田富行
    • Industrial Property Rights Type
      特許
    • Filing Date
      2023
    • Related Report
      2023 Annual Research Report
    • Overseas
  • [Patent(Industrial Property Rights)] 熱伝導接合構造、熱伝導接合方法、該熱伝導接合構造を有するヒートシンク、並びに該熱伝導接合構造を有する半導体装置2023

    • Inventor(s)
      巽裕章,井手拓哉,村上政明,沼田富行
    • Industrial Property Rights Holder
      巽裕章,井手拓哉,村上政明,沼田富行
    • Industrial Property Rights Type
      特許
    • Filing Date
      2023
    • Related Report
      2023 Annual Research Report
    • Overseas
  • [Patent(Industrial Property Rights)] 熱伝導接合構造、熱伝導接合方法、該熱伝導接合構造を有するヒートシンク、並びに該熱伝導接合構造を有する半導体装置2022

    • Inventor(s)
      巽裕章、井手拓哉、村上政明、沼田富行
    • Industrial Property Rights Holder
      巽裕章、井手拓哉、村上政明、沼田富行
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-133874
    • Filing Date
      2022
    • Related Report
      2022 Research-status Report

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Published: 2022-09-01   Modified: 2025-01-30  

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