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Logic threshold voltage stabilization in silicon carbide integrated circuits within a wide temperature range

Research Project

Project/Area Number 21K14209
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 21060:Electron device and electronic equipment-related
Research InstitutionKyoto University

Principal Investigator

Kaneko Mitsuaki  京都大学, 工学研究科, 助教 (60842896)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords炭化ケイ素 / 電界効果トランジスタ / 論理回路 / 閾値電圧 / イオン注入 / 厳環境 / 接合型電界効果トランジスタ / 深いドナー
Outline of Research at the Start

近年、200℃以上の高温環境で動作可能な集積回路に注目が集まっているが、既存のシリコン集積回路は材料物性の制約上動作が不可能である。高温動作が可能なシリコンカーバイドを使用した集積回路に注目が集まっているが、論理閾値電圧が温度と共に変化する課題を抱えている。本研究では材料科学・電子デバイス工学的観点でトランジスタ特性を制御することにより室温-400℃の超広温域における論理閾値電圧の安定化を目指す。

Outline of Final Research Achievements

In this study, we aimed to stabilize the logic threshold voltage of complementary circuits consisting of junction field-effect transistors made of silicon carbide (SiC), in order to develop integrated circuits that can operate in harsh environments. The amount of lateral diffusion of ion implanted atoms, which determines the JFET threshold voltage, was identified by crystallographic and device characterization. The use of deep donors in the channel region of n-channel JFETs was proposed, and sulfur was found suitable as a dopant by performing Hall effect measurements. We fabricated complementary JFETs composed of sulfur-doped nJFETs and demonstrated stabilization of logic threshold voltage from room temperature to 200℃.

Academic Significance and Societal Importance of the Research Achievements

イオン注入はパワーデバイスを作製する際にも必須の工程であり、得られた横方向拡散量はパワーデバイス設計にも有用である。一般的に、イオン化エネルギーの大きい深いドナーはデバイス応用上不利と考えられており、その研究はあまり行われていなかい。特に、SドープSiC層を電子デバイスに適用した報告は1報に限られており、その理解が進んでいなかった。本研究では、相補型JFETにSドープSiC層を世界で初めて適用し、理論予測通りに論理閾値電圧の変動が抑えられることを証明できた点が意義深い。なお、明らかとなったデバイス特性は他のワイドギャップ半導体におけるデバイス作製の際にも適用可能であるため、その波及効果は高い。

Report

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

    (26 results)

All 2024 2023 2022 2021

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results) Presentation (18 results) (of which Int'l Joint Research: 11 results,  Invited: 8 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] A Study of Complementary Logic Circuits Using SiC JFETs for Operation in High-Temperature Environments2024

    • Author(s)
      金子 光顕、木本 恒暢
    • Volume
      J107-C
    • Issue
      4
    • Pages
      145-153
    • DOI

      10.14923/transelej.2023JCI0015

    • ISSN
      1881-0217
    • Year and Date
      2024-04-01
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 350°C Operation of SiC Complementary JFET Logic Gates2023

    • Author(s)
      Kaneko Mitsuaki、Nakajima Masashi、Jin Qimin、Maeda Noriyuki、Kimoto Tsunenobu
    • Journal Title

      Proc. of 2023 IEEE CPMT Symposium Japan (ICSJ)

      Volume: - Pages: 180-183

    • DOI

      10.1109/icsj59341.2023.10339600

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Physical properties of sulfur double donors in 4H-SiC introduced by ion implantation2023

    • Author(s)
      Matsuoka Taiga、Kaneko Mitsuaki、Kimoto Tsunenobu
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: 1 Pages: 010908-010908

    • DOI

      10.35848/1347-4065/acb309

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Nearly Ideal Breakdown Voltage Observed in Lateral p-i-n Diodes Fabricated on a SiC High-Purity Semi-Insulating Substrate2023

    • Author(s)
      Kaneko M.、Tsibizov A.、Kimoto T.、Grossner U.
    • Journal Title

      IEEE Transactions on Electron Devices

      Volume: 70 Issue: 4 Pages: 2153-2156

    • DOI

      10.1109/ted.2023.3245998

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] SiC Complementary Junction Field-Effect Transistor Logic Gate Operation at 623 K2022

    • Author(s)
      Kaneko M.、Nakajima M.、Jin Q.、Kimoto T.
    • Journal Title

      IEEE Electron Device Letters

      Volume: 43 Issue: 7 Pages: 997-1000

    • DOI

      10.1109/led.2022.3179129

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Carrier Trapping Effects on Forward Characteristics of SiC p-i-n Diodes Fabricated on High-Purity Semi-Insulating Substrates2022

    • Author(s)
      Takahashi Katsuya、Tanaka Hajime、Kaneko Mitsuaki、Kimoto Tsunenobu
    • Journal Title

      IEEE Transactions on Electron Devices

      Volume: 69 Issue: 4 Pages: 1989-1994

    • DOI

      10.1109/ted.2022.3154673

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Lateral spreads of ion-implanted Al and P atoms in silicon carbide2021

    • Author(s)
      Jin Qimin、Nakajima Masashi、Kaneko Mitsuaki、Kimoto Tsunenobu
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: 5 Pages: 051001-051001

    • DOI

      10.35848/1347-4065/abf13d

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Progress of SiC MOSFETs and JFETs beyond Power Applications2023

    • Author(s)
      Tsunenobu Kimoto,Keita Tachiki,Kyota Mikami,Mitsuaki Kaneko
    • Organizer
      IME Workshop on Wide Bandgap Semiconductors 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Fundamentals of SiC Complementary MOSFETs and JFETs for Advanced IC Applications2023

    • Author(s)
      Tsunenobu Kimoto,Mitsuaki Kaneko
    • Organizer
      20th International Conference on Silicon Carbide and Related Materials (ICSCRM2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Carrier compensating center density in n-type layers formed by ion implantation into high-purity semi-insulating 4H-SiC substrates2023

    • Author(s)
      Qimin Jin,Chansoon Koo,Mitsuaki Kaneko,Tsunenobu Kimoto
    • Organizer
      20th International Conference on Silicon Carbide and Related Materials (ICSCRM2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] Over 600℃ operation of a bottom-gate p-JFET with double-well structure fabricated by ion implantation on an n-type SiC epilayer2023

    • Author(s)
      Shunya Shibata,Taiga Matsuoka,Mitsuaki Kaneko,Tsunenobu Kimoto
    • Organizer
      20th International Conference on Silicon Carbide and Related Materials (ICSCRM2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] A Sulfur-doped n-JFET for a reduced logic threshold voltage shift in a SiC CJFET inverter2023

    • Author(s)
      Mitsuaki Kaneko,Taiga Matsuoka,Tsunenobu Kimoto
    • Organizer
      20th International Conference on Silicon Carbide and Related Materials (ICSCRM2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] Carrier transport and barrier height of S+-implanted SiC Schottky barrier diodes2023

    • Author(s)
      Manato Takayasu,Taiga Matsuoka,Masahiro Hara,Mitsuaki Kaneko,Tsunenobu Kimoto
    • Organizer
      20th International Conference on Silicon Carbide and Related Materials (ICSCRM2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] Minimum Channel Length for Suppressing Short-Channel Effects in SiC JFETs2023

    • Author(s)
      Mitsuaki Kaneko,Noriyuki Maeda,Tsunenobu Kimoto
    • Organizer
      20th International Conference on Silicon Carbide and Related Materials (ICSCRM2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] SiC Complementary Junction Field-Effect Transistor Logic Gate Operation at 623 K [IEEE EDL]2023

    • Author(s)
      Mitsuaki Kaneko,Masashi Nakajima,Qimin Jin,Tsunenobu Kimoto
    • Organizer
      The 23rd Kansai Colloquium Electron Devices Workshop
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 350℃ operation of SiC complementary JFET logic gates2023

    • Author(s)
      Mitsuaki Kaneko,Masashi Nakajima,Qimin Jin,Noriyuki Maeda,Tsunenobu Kimoto
    • Organizer
      12th IEEE CPMT Symposium Japan (ICSJ2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] High-Temperature Operation of SiC JFET-Based Complementary Circuits2022

    • Author(s)
      Mitsuaki Kaneko, Masashi Nakajima,Qimin Jin, Tsunenobu Kimoto
    • Organizer
      2022 Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] High temperature operation of SiC complementary JFET logic gates fully fabricated by ion implantation2022

    • Author(s)
      Mitsuaki Kaneko, Masashi Nakajima, Qimin Jin, Tsunenobu Kimoto
    • Organizer
      19th International Conference on Silicon Carbide and Related Materials (ICSCRM2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Anomalously high electron mobility in S-implanted n-type SiC2022

    • Author(s)
      Taiga Matsuoka, Mitsuaki Kaneko, Tsunenobu Kimoto
    • Organizer
      19th International Conference on Silicon Carbide and Related Materials (ICSCRM2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Remarkable improvement of threshold voltage controllability in ion-implantation-based SiC JFETs by adopting bottom-gate structure2022

    • Author(s)
      Shunya Shibata, Taiga Matsuoka, Mitsuaki Kaneko, Tsunenobu Kimoto
    • Organizer
      19th International Conference on Silicon Carbide and Related Materials (ICSCRM2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高温動作集積回路を目指したSiC相補型JFETの基礎研究2022

    • Author(s)
      金子 光顕, 中島 誠志, 金 祺民, 前田 憲幸, 木本 恒暢
    • Organizer
      応用物理学会先進パワー半導体分科会 第9回講演会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Hall効果測定によるSイオン注入n型SiC層の電気的性質評価2022

    • Author(s)
      松岡 大雅, 金子 光顕, 木本 恒暢
    • Organizer
      応用物理学会先進パワー半導体分科会 第9回講演会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Impacts of High-Concentration Carrier Traps on Electrical Characteristics of p-i-n Diodes on HPSI SiC Substrates2021

    • Author(s)
      Katsuya Takahashi, Hajime Tanaka, Mitsuaki Kaneko, Tsunenobu Kimoto
    • Organizer
      13th European Conference on Silicon Carbide and Related Materials (ECSCRM2020・2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] SPICE model reproducing the static and dynamic characteristics of a SiC complementary JFET inverter from 300 to 573 K2021

    • Author(s)
      Noriyuki Maeda, Mitsuaki Kaneko, Hajime Tanaka, Tsunenobu Kimoto
    • Organizer
      13th European Conference on Silicon Carbide and Related Materials (ECSCRM2020・2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Suppression of a logic-threshold-voltage shift in a SiC complementary JFET logic gate at high temperature2021

    • Author(s)
      Mitsuaki Kaneko, Masashi Nakajima, Tsunenobu Kimoto
    • Organizer
      13th European Conference on Silicon Carbide and Related Materials (ECSCRM2020・2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] SiC相補型電界効果トランジスタ2022

    • Inventor(s)
      金子 光顕, 松岡 大雅, 木本 恒暢
    • Industrial Property Rights Holder
      金子 光顕, 松岡 大雅, 木本 恒暢
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-065535
    • Filing Date
      2022
    • Related Report
      2022 Research-status Report

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

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