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Formation of high-quality semiconductor thin films on insulator for transistor application

Research Project

Project/Area Number 22K04186
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 InstitutionKyushu University

Principal Investigator

佐道 泰造  九州大学, システム情報科学研究院, 准教授 (20274491)

Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2024: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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半導体 / 結晶成長 / トランジスタ
Outline of Research at the Start

集積回路のさらなる高性能化(高速化,省電力化)には、新しい三次元トランジスタが有用である。本研究では、申請者が保有する「絶縁膜上におけるIV族半導体の固相成長」に関する独自シーズ技術を基に、絶縁膜上における極薄半導体膜の固相成長の学理体系を構築し、絶縁膜上の所定の位置に大粒径を有する極薄Ge結晶を形成する手法を開発する。これにより、三次元トランジスタの基盤技術を創出する。

Outline of Annual Research Achievements

集積回路のさらなる高性能化(高速化,省電力化)には、新しい三次元トランジスタが有用である。本研究では、申請者が保有する「絶縁膜上におけるIV族半導体の固相成長」に関する独自シーズ技術を基に、絶縁膜上における極薄半導体膜の固相成長の学理体系を構築し、絶縁膜上の所定の位置に大粒径を有する極薄Ge結晶を形成する手法を開発する。これにより、三次元トランジスタの基盤技術を創出する。
本年度は3年計画の第2年度として、前年度に引き続き「微量Sn添加(~2%)と界面層付加による高移動度Ge薄膜の固相成長」および「キャップ層付加によるGe薄膜の大粒径化」を基に、極薄Ge膜の固相成長機構を評価するとともに、電気特性の向上を目指し、熱処理プロセスの適正化を開始した。
基板上にバッファ層を形成して非晶質Sn添加Ge膜を堆積し、その上部にキャップ層を付加して熱処理することで固相成長を誘起した。成長速度を光学顕微鏡法および電子顕微鏡法を用いて測定し、成長速度を熱処理温度の関数として評価することで、成長速度の活性化エネルギーを解析した。その結果、バッファ層およびキャップ層を付加することで、成長速度の活性化エネルギーが低下することを見いだした。成長速度の活性化エネルギーが低下することで結晶核の成長が促進し、結晶粒径の拡大化が実現することを明らかにした。
さらに、成長層の電気特性を向上するため、熱処理プロセスの探索を開始した。その結果、従来の試料構造では、固相成長後に熱処理を行うと電気特性が向上するが、バッファ層およびキャップ層を付加した試料では、固相成長後に熱処理を行っても電気特性が変化しないことが明らかとなった。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

綿密な実験計画を立案し、推進したことにより、研究が計画通り順調に進展した。

Strategy for Future Research Activity

今年度も研究が順調に進展したので、今後も実験計画を綿密に立案し、研究を推進してゆく。
具体的には、非晶質Sn添加Ge薄膜の固相成長に与えるバッファ層およびキャップ層の効果を定量的に解明すると共に、従来材料に対するSn添加Ge薄膜の優位性を実証するためのデバイス試作を推進する。

Report

(2 results)
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (23 results)

All 2023 2022

All Journal Article (6 results) (of which Peer Reviewed: 6 results) Presentation (17 results) (of which Int'l Joint Research: 15 results,  Invited: 3 results)

  • [Journal Article] Improved carrier mobility of Sn-doped Ge thin films (<20 nm) on insulator by interface-modulated solid-phase crystallization combined with surface passivation2023

    • Author(s)
      Nagano Takaya、Hara Ryutaro、Moto Kenta、Yamamoto Keisuke、Sadoh Taizoh
    • Journal Title

      Materials Science in Semiconductor Processing

      Volume: 165 Pages: 107692-107692

    • DOI

      10.1016/j.mssp.2023.107692

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Grain Enlargement of Ultrathin Si Films on Insulators by Sn-Doping2023

    • Author(s)
      Hanafusa Yuki、Okamoto Kota、Sadoh Taizoh
    • Journal Title

      Extended Abstracts of the 2023 International Conference on Solid State Devices and Materials

      Volume: - Pages: 871-872

    • DOI

      10.7567/ssdm.2023.ps-11-03

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] High Carrier Mobility of Sn-Doped Ge Thin-Films (<20 nm) by Thinning Combined with Post-Annealing2023

    • Author(s)
      Koga Taishiro、Nagano Takaya、Moto Kenta、Yamamoto Keisuke、Sadoh Taizoh
    • Journal Title

      Extended Abstracts of the 2023 International Conference on Solid State Devices and Materials

      Volume: - Pages: 873-874

    • DOI

      10.7567/ssdm.2023.ps-11-04

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ultra-High Concentration Doping by Excimer Laser Annealing Using Solid-Diffusion Source2023

    • Author(s)
      Aoki Ren、Katayama Keita、Nakamura Daisuke、Yabuta Hisato、Ikenoue Hiroshi、Sadoh Taizoh
    • Journal Title

      Extended Abstracts of the 2023 International Conference on Solid State Devices and Materials

      Volume: - Pages: 883-884

    • DOI

      10.7567/ssdm.2023.ps-11-09

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Modulation of Schottky barrier at metal/Ge contacts by phosphoric acid coating and excimer laser annealing2023

    • Author(s)
      Katayama Keita、Ikenoue Hiroshi、Sadoh Taizoh
    • Journal Title

      Materials Science in Semiconductor Processing

      Volume: 160 Pages: 107433-107433

    • DOI

      10.1016/j.mssp.2023.107433

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Solid-Phase Crystallization Characteristics of Interface-Modulated Sn- Doped Ge Thin Films on Insulator with Capping2022

    • Author(s)
      Nagano Takaya、Hara Ryutaro、Sadoh Taizoh
    • Journal Title

      International Workshop on Active-Matrix Flatpanel Displays and Devices

      Volume: 29 Pages: 114-115

    • DOI

      10.23919/am-fpd54920.2022.9851292

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Sn-Doped Si Thin-Films on Insulator by Solid-Phase Crystallization2023

    • Author(s)
      Y. Hanafusa, K. Okamoto, and T. Sadoh
    • Organizer
      30th International Workshop on Active-Matrix Flatpanel Displays and Devices -TFT Technologies and FPD Materials-
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Excimer Laser Doping for PN Junction Formation with Extremely Low Thermal Budget2023

    • Author(s)
      R. Aoki, K. Katayama, D. Nakamura, H. Ikenoue, and T. Sadoh
    • Organizer
      30th International Workshop on Active-Matrix Flatpanel Displays and Devices -TFT Technologies and FPD Materials-
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Improved Carrier Mobility of Sn-Doped Ge Thin-Films (<20 nm) by Post-Annealing for Thin-Film Transistor Application2023

    • Author(s)
      T. Koga, T. Nagano, K. Moto, K. Yamamoto, and T. Sadoh
    • Organizer
      30th International Workshop on Active-Matrix Flatpanel Displays and Devices -TFT Technologies and FPD Materials-
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Growth Characteristics of Sn-Doped Si Thin-Filmson Insulator2023

    • Author(s)
      Yuki Hanafusa, Kota Okamoto, and Taizoh. Sadoh
    • Organizer
      2023 Asia-Pacific Workshop on Advanced Semiconductor Devices
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Formation of pn Junctions by Doping Using Excimer Laser Annealing2023

    • Author(s)
      Ren Aoki, Keita Katayama, Daisuke Nakamura, Hisato Yabuta, Hiroshi Ikenoue, and Taizoh Sadoh
    • Organizer
      The 12th Asia-Pacific Laser Symposium
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Grain Enlargement of Ultrathin Si Films on Insulators by Sn-Doping2023

    • Author(s)
      Yuki Hanafusa, Kota Okamoto, and Taizoh Sadoh
    • Organizer
      2023 International Conference on Solid State Materials and Devices
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] High Carrier Mobility of Sn-Doped Ge Thin-Films (<20 nm) by Thinning Combined with Post-Annealing2023

    • Author(s)
      Taishiro Koga, Takaya Nagano, Kenta Moto, Keisuke Yamamoto, and Taizoh Sadoh
    • Organizer
      2023 International Conference on Solid State Materials and Devices
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ultra-High Concentration Doping by Excimer Laser Annealing Using Solid-Diffusion Source2023

    • Author(s)
      Ren Aoki, Keita Katayama, Daisuke Nakamura, Hisato Yabuta, Hiroshi Ikenoue, and Taizoh Sadoh
    • Organizer
      2023 International Conference on Solid State Materials and Devices
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effects of Capping Layers on Solid-Phase Crystallization of Sn-Doped Ge Thin Films on Insulators2023

    • Author(s)
      Ryu Hashimoto, Taishiro Koga, Takaya Nagano, Kenta Moto, Keisuke Yamamoto, Taizoh Sadoh
    • Organizer
      14th International WorkShop on New Group IV Semiconductor Nanoelectronics
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] 絶縁膜上におけるSn添加Ge薄膜の固相成長とTFT応用2023

    • Author(s)
      佐道 泰造
    • Organizer
      第41回シリサイド系半導体研究会
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] 絶縁膜上におけるIV族系半導体薄膜の低温固相成長2023

    • Author(s)
      古賀 泰志郎, 花房 佑樹, 茂藤 健太, 山本 圭介, 佐道 泰造
    • Organizer
      薄膜材料デバイス研究会第20回研究集会
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] Solid-Phase Crystallization Characteristics of Interface-Modulated Sn-Doped Ge Thin Films on Insulator with Capping2022

    • Author(s)
      Takaya Nagano, Ryutaro Hara, and Taizoh Sadoh
    • Organizer
      29th International Workshop on Active-Matrix Flatpanel Displays and Devices
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Improved Solid-Phase Crystallization of Sn-Doped Ge Thin Films (< 50 nm) on Insulator by a-Si Capping2022

    • Author(s)
      Takaya Nagano, Ryutaro Hara, Kenta Moto, Keisuke Yamamoto, and Taizoh Sadoh
    • Organizer
      9th International Symposium on Control of Semiconductor Interfaces
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Solid-Phase Crystallization Characteristics of SiSn Thin Film on Insulating Substrates2022

    • Author(s)
      Kota Okamoto, Tomohiro Kosugi, and Taizoh Sadoh
    • Organizer
      9th International Symposium on Control of Semiconductor Interfaces
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Improved Carrier Mobility of Sn-Doped Ge Ultrathin (<50nm) Films on Insulator by a-Si Capping in Solid-Phase Crystallization2022

    • Author(s)
      Takaya Nagano, Ryutaro Hara, Kenta Moto, Keisuke Yamamoto, and Taizoh Sadoh
    • Organizer
      2022 International Conference on Solid State Materials and Devices
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ultrathin Large Grain Si Films on Insulator by Solid-Phase Crystallization Combined with Sn-Doping2022

    • Author(s)
      Kota Okamoto, Tomohiro Kosugi, and Taizoh Sadoh
    • Organizer
      2022 International Conference on Solid State Materials and Devices
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] (Invited) Interface-Modulated Solid-Phase Crystallization of Sn-Doped Ge Ultra-thin Films for Advanced TFT2022

    • Author(s)
      Taizoh Sadoh, Takaya Nagano, Taishiro Koga, Kenta Moto, and Keisuke Yamamoto
    • Organizer
      The 29th International Display Workshops
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2022-04-19   Modified: 2024-12-25  

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