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Development of High-Throughput Micro-LED Fabrication Process Utilizing Crystallographic Orientation Modulated Templates

Research Project

Project/Area Number 19K22145
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 30:Applied physics and engineering and related fields
Research InstitutionOsaka University

Principal Investigator

Katayama Ryuji  大阪大学, 工学研究科, 教授 (40343115)

Co-Investigator(Kenkyū-buntansha) 上向井 正裕  大阪大学, 工学研究科, 助教 (80362672)
Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
KeywordsμLED / 結晶面方位 / MOVPE / 表面活性化接合 / パルススパッタ / パルスレーザ堆積
Outline of Research at the Start

本研究では、一画素分のLEDチップを一つずつ並べて実装するという現状のマイクロ(μ)LEDパネルの極めて高価な製造コストと長い製造時間を劇的に低減する、結晶工学的技術の開発を目的とする。表面活性化ウエハ接合技術を用い、三種の異なる結晶面方位と面積を有する微小ドメインを周期的に並べた結晶面方位変調GaNテンプレートを作製し、この上にInGaN量子井戸発光層を成長する。その際、結晶中へのIn原子の取り込み効率が面方位により顕著に異なる性状を利用することで、フルカラーμLEDの集合体の高スループット作製プロセスを実証する。

Outline of Final Research Achievements

The purpose of this research was to develop a crystallographic technology that dramatically reduces the extremely expensive manufacturing cost and long manufacturing duration of the current μLED panels, in which each LED chip for one pixel is picked and placed separately. Crystallographic-orientation-modulated GaN templates tiled with microdomains with different crystallographic orientations were successfully prepared utilizing the surface-activated wafer bonding technology, and an InGaN quantum wells were grown on the template. Here we demonstrated a high-throughput fabrication process for full-color μLED utilizing the strong dependences of the In incorporation efficiency as well as of the emission wavelength shift due to the quantum confinement Stark effect on the crystallographic orientations of InGaN growth.

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた、結晶面方位の異なる薄膜の積層技術とこれを用いて作製する結晶面方位変調テンプレートは、現状のエピタキシャル成長技術では実現し得ない新規構造のデバイス実現への道を拓く、結晶工学分野における革新的なツールとなる。つまり、本研究で提案する技術開発は、窒化物半導体材料やμLEDのみならず、縦型パワートランジスタ、垂直共振器型レーザなど、全ての集積型デバイス・システム開発の突破口となりうることから、学術的意義のみならず革新的な省エネルギー技術を提供することで、社会に貢献できる。

Report

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

    (21 results)

All 2021 2020 2019

All Presentation (20 results) (of which Int'l Joint Research: 9 results,  Invited: 9 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)

  • [Presentation] 表面活性化接合を用いた面方位変調GaNテンプレートの作製と組成変調InGaN量子井戸の有機金属気相成長2021

    • Author(s)
      田辺 凌、吉田 新、安田悠馬、上向井正裕、谷川智之、片山竜二
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Novel wavelength converters made of nitride semiconductors: transverse QPM waveguides and monolithic microcavities2021

    • Author(s)
      R. Katayama, M. Uemukai, and T. Tanikawa
    • Organizer
      SPIE Photonics West 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Novel Method of Short-Wavelength Emission from Polarity-Inverted Nitride Semiconductor Waveguides2021

    • Author(s)
      R. Katayama, M. Uemukai, and T. Tanikawa
    • Organizer
      第8回結晶成長と結晶技術に関するアジア会議 (CGCT-8)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 窒化物半導体極性制御特異構造の形成技術の深化と物性・機能の制御2021

    • Author(s)
      片山 竜二
    • Organizer
      新学術領域研究 特異構造の結晶科学 オンライン成果報告・連絡会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ワイドギャップ窒化物半導体波長変換デバイスによる紫外光発生2020

    • Author(s)
      片山 竜二
    • Organizer
      応用電子物性分科会研究例会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Fabrication of GaN Polarity-Inverted Structure by Inductively Coupled Plasma Reactive Ion Etching and Surface Activated Bonding2020

    • Author(s)
      Naoki Yokoyama, Ryo Tanabe, Shuhei Ichikawa, Yasufumi Fujiwara, Masahiro Uemukai, Tomoyuki Tanikawa and Ryuji Katayama
    • Organizer
      第39回 電子材料シンポジウム EMS39
    • Related Report
      2020 Annual Research Report
  • [Presentation] ワイドギャップ半導体の分極制御と量子光学応用:遠UVC全固体光源2020

    • Author(s)
      片山 竜二,上向井 正裕,谷川 智之
    • Organizer
      第81回 応用物理学会秋季学術講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Inductively coupled plasma reactive ion etching of GaN films maintaining surface flatness for surface activated bonding2020

    • Author(s)
      N. Yokoyama, R. Tanabe, T. Morikawa, Y. Fujiwara, M. Uemukai, T. Tanikawa, R. Katayama
    • Organizer
      第8回 発光素子とその産業応用に関する国際学会 LEDIA'20
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 表面活性化接合に必要な表面平坦性を維持するGaNのエッチング2020

    • Author(s)
      横山 尚生,田辺 凌,森川 隆哉,藤原 康文,上向井 正裕,谷川 智之,片山 竜二
    • Organizer
      第67回 応用物理学会春季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Bonding Strength of Polarity-Inverted GaN/GaN Structure Fabricated by Surface-Activated Bonding2019

    • Author(s)
      R. Tanabe, N. Yokoyama, M. Uemukai, T. Tanikawa and R. Katayama
    • Organizer
      APWS2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Quantum Optical Application of Nitride Semiconductor2019

    • Author(s)
      R. Katayama, M. Uemukai and T. Tanikawa
    • Organizer
      International Workshop on Creation of Singularity Structures
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Bonding Strength Optimization of Polarity-Inverted GaN/GaN Structure Fabricated by Surface-Activated Bonding2019

    • Author(s)
      N. Yokoyama, R. Tanabe, M. Uemukai, T. Tanikawa and R. Katayama
    • Organizer
      第38回 電子材料シンポジウム EMS38
    • Related Report
      2019 Research-status Report
  • [Presentation] Raman Scattering Evaluation of Strain Evolution During Surface-Activated Bonding of GaN and Removal of Si Substrate2019

    • Author(s)
      R. Tanabe, N. Yokoyama, M. Uemukai, T. Hikosaka, S. Nunoue, K. Shojiki, H. Miyake, M. Kushimoto, H. Cheong, Y. Honda, H. Amano and R. Katayama
    • Organizer
      第38回 電子材料シンポジウム EMS38
    • Related Report
      2019 Research-status Report
  • [Presentation] ワイドギャップ半導体を用いた新規波長変換デバイスの開発ー極性反転導波路と微小共振器ー2019

    • Author(s)
      片山 竜二,上向井 正裕,谷川 智之
    • Organizer
      第80回 応用物理学会秋季学術講演会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 表面活性化接合により作製したGaN分極反転積層構造の接合強度評価2019

    • Author(s)
      田辺 凌,横山 尚生,上向井 正裕,谷川 智之,片山 竜二
    • Organizer
      第80回 応用物理学会秋季学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Quantum Optical Application of Nitride Semiconductor: DUV Laser and Quantum Computer2019

    • Author(s)
      R. Katayama, M. Uemukai and T. Tanikawa
    • Organizer
      紫外発光材料及びデバイスに関する国際ワークショップ IWUMD2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Nonlinear Optical Application of Nitride Semiconductors: Polarity-Inverted Waveguides and Microcavities2019

    • Author(s)
      R. Katayama, M. Uemukai and T. Tanikawa
    • Organizer
      固体素子と材料に関する国際会議 SSDM2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 窒化物半導体波長変換デバイスの開発ー極性反転導波路と微小共振器ー2019

    • Author(s)
      片山 竜二,上向井 正裕,谷川 智之
    • Organizer
      第11回 日本結晶成長学会 ナノ構造・エピタキシャル成長講演会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Nonlinear Optical Application of Nitride Semiconductors: Polarity-Inverted Waveguides and Microcavities2019

    • Author(s)
      R. Katayama
    • Organizer
      Workshop on Nitride Semiconductor Lasers
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Raman Scattering Investigation of Strain Evolution during Surface-Activated Bonding of GaN and Removal of Si Substrate2019

    • Author(s)
      R. Tanabe, T. Onodera, M. Uemukai, T. Hikosaka, S. Nunoue, K. Shojiki, H. Miyake, M. Kushimoto, H.J. Cheong, Y. Honda, H. Amano and R. Katayama
    • Organizer
      第7回 発光素子とその産業応用に関する国際学会 LEDIA'19
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] 窒化物半導体膜の形成方法2021

    • Inventor(s)
      高橋伸明、三浦仁嗣、根石浩司、片山竜二、森勇介、今西正幸
    • Industrial Property Rights Holder
      高橋伸明、三浦仁嗣、根石浩司、片山竜二、森勇介、今西正幸
    • Industrial Property Rights Type
      特許
    • Filing Date
      2021
    • Related Report
      2020 Annual Research Report
    • Overseas

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Published: 2019-07-04   Modified: 2025-01-30  

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