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4T LT poly-Si TFT with NC technology on glass substrate for low-cost IoT devices

Research Project

Project/Area Number 19K04534
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 21060:Electron device and electronic equipment-related
Research InstitutionTohoku Gakuin University

Principal Investigator

HARA Akito  東北学院大学, 工学部, 教授 (20417398)

Co-Investigator(Kenkyū-buntansha) 鈴木 仁志  東北学院大学, 工学部, 准教授 (70351319)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords薄膜トランジスタ / 多結晶シリコン / 多結晶ゲルマニウム / 高誘電体 / 強誘電体 / 4端子 / 負性容量 / シリコン / ゲルマニウム
Outline of Research at the Start

IoTエッジデバイスをシリコン以外の基板上に形成する技術は、IoTエッジデバイスの多様化・多機能化とともに今後重要になる。本研究は、代表者が独自開発した高移動度を有する4T LT poly-Si TFTに対してNC技術を融合することで、高移動度(>300 cm2/Vs)・精密Vth制御・小さいs値(<100 mV/dec)の3要素全てを満足させ、Vdd=1.0 Vでgain>10を有するCMOSインバータを安価ガラス基板上で実現することを目指す。これにより、安価ガラス基板上に低価格・低消費電力IoTエッジデバイスを実現するためのデバイス・イノベーションを実現する。

Outline of Final Research Achievements

A CMOS inverter was fabricated using four-terminal (4T) poly-Si TFTs with high-k HfO2 gate dielectric. To operate CMOS inverters at low VDD voltages, it is necessary to control the threshold voltage (Vth). In this study, a 4T structure was used to control Vth, and the gate width of the p-channel was designed to be three times that of the n-channel to balance the on-current. A CMOS inverter with a logic threshold of 0.5 V and a gain of 14 at VDD = 1.0 V was designed successfully. In addition, we successfully operated Cu-MIC 4T poly-GeSn TFTs using HfO2 on a glass substrate.
Ferroelectric HfZrO2 was fabricated using a single target sputtering system. Although ferroelectricity was observed in the RTA thin film, it was weak. This is due to the formation of an additional oxide layer at the interface.

Academic Significance and Societal Importance of the Research Achievements

IoTエッジデバイスをシリコン以外の基板上に形成する技術は、IoTエッジデバイスの多様化・多機能化とともに今後重要になる。代表者が独自開発した高移動度を有する4端子低温多結晶シリコンTFTに対して負性容量技術を融合することで、高移動度(>300 cm2/Vs)・精密Vth制御・小さいs値(<100 mV/dec)の3要素全てを満足させ、Vdd=1.0 Vでgain>10を有するCMOSインバータを安価ガラス基板上で実現することを目指した。これにより、安価ガラス基板上に低価格・低消費電力IoTエッジデバイスを実現するためのデバイス・イノベーションを実現する。

Report

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

    (19 results)

All 2022 2021 2020 2019 Other

All Journal Article (6 results) (of which Peer Reviewed: 6 results) Presentation (11 results) (of which Int'l Joint Research: 2 results) Remarks (2 results)

  • [Journal Article] Effects of germanium composition on performance of continuous-wave laser lateral crystallization n-channel polycrystalline silicon-germanium thin-film transistors on glass substrate2021

    • Author(s)
      Hara Akito、Kitahara Kuninori
    • Journal Title

      IEEE Explore, 2021 28th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD)

      Volume: - Pages: 51-54

    • DOI

      10.23919/am-fpd52126.2021.9499190

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Four-Terminal Polycrystalline-Silicon Thin-Film Transistors with High-k HfO2 Dielectric on Glass Substrate2021

    • Author(s)
      Kudo Kenta、Kimura Jyunki、Suzuki Takumi、Nishiguchi Naoki、Hara Akito
    • Journal Title

      IEEE Explore, 2021 28th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD)

      Volume: - Pages: 118-119

    • DOI

      10.23919/am-fpd52126.2021.9499186

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Raman scattering spectroscopy for solid-phase and metal-induced crystallization of extremely thin germanium films on glass2021

    • Author(s)
      Kitahara Kuninori、Tsukada Shinya、Kanagawa Akari、Hara Akito
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: 3 Pages: 035505-035505

    • DOI

      10.35848/1347-4065/abe2b7

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Four-terminal polycrystalline Ge1-xSn x thin-film transistors using copper-induced crystallization on glass substrates and their application to enhancement/depletion inverters2020

    • Author(s)
      Miyazaki Ryo、Hara Akito
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: 5 Pages: 051008-051008

    • DOI

      10.35848/1347-4065/ab8b74

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Crystallization of Cu-doped thin Ge film assisted with a Cu-Ge droplet2020

    • Author(s)
      Hara Akito、Suzuki Hitoshi、Utsumi Hiroki、Miyazaki Ryo、Kitahara Kuninori
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: 8 Pages: 088004-088004

    • DOI

      10.35848/1347-4065/aba6fd

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Four-terminal Cu-MIC Poly-Ge1?xSnx TFT with a High-k Bottom-gate Dielectric2019

    • Author(s)
      Ryo Miyazaki and Akito Hara
    • Journal Title

      2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD)

      Volume: 26 Pages: 1-2

    • DOI

      10.23919/am-fpd.2019.8830606

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] ガラス基板上の n-ch および p-ch 自己整合ダブルゲート Cu-MIC poly-Ge TFT2022

    • Author(s)
      鈴木 翔、冨塚 啓吾、原 明人
    • Organizer
      2022年 第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ガラス基板上の 4 端子 poly-Si TFT の高性能化と光センサへの応用2021

    • Author(s)
      木村純樹、工藤健太、早坂奏音、原明人
    • Organizer
      2021年東北地区若手研究者研究発表会
    • Related Report
      2020 Research-status Report
  • [Presentation] ガラス基板上のレーザラテラル結晶化 poly-Si1-xGex TFT の特性2021

    • Author(s)
      原 明人 、 北原邦紀
    • Organizer
      2021年春応用物理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] Cuナノ粒子を含有するGe薄膜におけるナノスケール液滴による結晶化2020

    • Author(s)
      原 明人、鈴木仁志、北原邦紀
    • Organizer
      2020年 秋 応用物理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 高誘電率ゲート絶縁膜を利用した4端子低温poly-Si薄膜トランジスタ の開発とセンサへの応用2020

    • Author(s)
      鈴木択実、小林達也、原明人
    • Organizer
      令和2年東北地区若手研究者研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] 拡張ゲートpHセンサに向けたガラス基板上の4端子低温poly-Si TFT2020

    • Author(s)
      鈴木拓実,西口尚希, 原明人, 佐藤旦,田部井哲夫
    • Organizer
      2019生体医歯工学共同研究拠点成果報告会
    • Related Report
      2019 Research-status Report
  • [Presentation] Cu-MIC 4端子poly-Ge1-xSnx TFTの性能およびインバータへの応用2020

    • Author(s)
      宮崎僚、原明人
    • Organizer
      2020年春季応用物理学会講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] ガラス基板上のhigh-k絶縁膜を有する4端子低温poly-Si TFTの特性2019

    • Author(s)
      西口尚希、原明人
    • Organizer
      2019年秋季応用物理学会講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Highly Sensitive Four-Terminal Low-Temperature Poly-Si TFT with HfO2 Gate Stack on Glass Substrate for Extended-Gate pH Sensing2019

    • Author(s)
      Takumi Suzuki, Naoki Nishiguchi, Tadashi Sato, Tetsuo Tabei, Akito Hara
    • Organizer
      The 4th International Symposium on Biomedical Engineering
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ryo Miyazaki and Akito Hara2019

    • Author(s)
      E/E Inverter Using Four-Terminal Poly-GexSn1-x TFTs on Glass
    • Organizer
      The 26th International Display Workshops
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 宮崎僚、原明人2019

    • Author(s)
      ガラス基板上の自己整合四端子ジャンクションレス p-ch Cu-MIC poly-Ge1-xSnx TFT の E/D インバータ応用
    • Organizer
      東北支部応用物理学会講演会
    • Related Report
      2019 Research-status Report
  • [Remarks] 東北学院大学 工学部 教員紹介 原明人

    • URL

      https://www.tohoku-gakuin.ac.jp/faculty/engineering/elec/staff/hara.html

    • Related Report
      2020 Research-status Report
  • [Remarks] 東北学院大学工学部電気電子工学科教員紹介 原明人

    • URL

      https://www.tohoku-gakuin.ac.jp/faculty/engineering/elec/staff/hara.html

    • Related Report
      2019 Research-status Report

URL: 

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

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