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Top emission UV-LEDs using h-BN

Research Project

Project/Area Number 21K04147
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 InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Yamada Hisashi  国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 主任研究員 (60644432)

Co-Investigator(Kenkyū-buntansha) 熊谷 直人  国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 主任研究員 (40732152)
山田 寿一  国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, ラボ研究主幹 (20358261)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
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)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords六方晶窒化ホウ素 / AlGaN / UV-LED / MOCVD / 残留不純物 / 格子緩和 / 貫通転位 / ジボラン / 歪み緩和 / 光反射 / AlGaN系LED / トップエミッション型 / 紫外光域
Outline of Research at the Start

紫外光域の高輝度光源実現のため、六方晶窒化ホウ素(h-BN)を用いたトップエミッション型AlGaN系LED構造をMOCVDで一貫成長にて行う。AlGaN系LEDの4つの課題(格子整合する基板が存在しない、正孔注入効率が低い、電子オーバーフロー、低Al組成AlGaNやGaNに吸収される)を解決するため、AlGaN歪み緩和・光反射超格子層およびAlGaNとの正孔障壁が低いh-BN正孔注入層を用いる。これらをMOCVD一貫成長にて行うことで急峻な界面と残留不純物の低減が可能となるため高効率LEDが実現できる。この新しい紫外光域トップエミッション型LED構造の作製及び高効率化の実証を行う。

Outline of Final Research Achievements

Top-emission AlGaN-based LED structures with hexagonal boron nitride (h-BN), which has a larger band gap than the emission layer, were grown by MOCVD to achieve a high-brightness light source in the UV region. Atomically smooth, fully strain-relaxed, and light-reflectivity in the 280 nm band >80% AlGaN buffer layer was successfully grown on an AlN template. The AlGaN-MQWs deposited on the AlGaN buffer layers showed strong PL emission at room temperature, with a FWHM of 5nm. The origin of the C, O and Si residual impurities in the h-BN films was identified. Optimized growth conditions, such as B2H6 and NH3 precursors and BN susceptors enabled reduction in residual impurities by two orders of magnitude.

Academic Significance and Societal Importance of the Research Achievements

現状のAlGaN系UV-LEDが直面している4つの課題(格子整合する基板が存在しない、正孔注入効率が低い、電子オーバーフロー、低Al組成AlGaNやGaNに吸収される)に対して、本研究はボトルネック解消となる一つのアプロ―チを示した。AlN下地上に表面平坦性を維持したまま、完全に格子緩和するAlGaN成膜技術はUV-LEDのみならずVCSEL、さらには電子デバイスへの応用が期待できるものであり、学術的・社会的意義がある。

Report

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

    (7 results)

All 2024 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (2 results) (of which Int'l Joint Research: 2 results) Patent(Industrial Property Rights) (2 results) (of which Overseas: 1 results)

  • [Journal Article] Metal Organic Chemical Vapor Deposition of n-AlGaN Grown on Strain-Relaxed Distributed Bragg Reflector Buffer Layers2024

    • Author(s)
      Hisashi Yamada, Naoto Kumagai, Toshikazu Yamada
    • Journal Title

      Phys. Status Solidi B

      Volume: 2024 Issue: 11

    • DOI

      10.1002/pssb.202300558

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reduction in Residual Impurities in Chemical Vapor Deposition-Grown Hexagonal Boron Nitride Thin Films2023

    • Author(s)
      Yamada Hisashi
    • Journal Title

      physica status solidi (b)

      Volume: 2023 Issue: 8 Pages: 2200352-2200352

    • DOI

      10.1002/pssb.202200352

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Fully-relaxed n-AlGaN on AlN / Al2O3 templates using strain-relaxed super-lattice buffer layers2022

    • Author(s)
      Yamada Hisashi
    • Journal Title

      Materials Chemistry and Physics

      Volume: 291 Pages: 126738-126738

    • DOI

      10.1016/j.matchemphys.2022.126738

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Growth of high purity CVD-grown h-BN using B2H6 and NH32023

    • Author(s)
      Hisashi YAMADA
    • Organizer
      International Conference on Crystal Growth and Epitaxy
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MOCVD of AlGaN MQWs Grown on Stain Relaxed Superlattice DBR Buffer Layers toward UV top emission LEDs2023

    • Author(s)
      Hisashi YAMADA, Naoto KUMAGAI, Toshikazu YAMADA
    • Organizer
      14th International Conference on Nitride Semiconductors
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] 化合物半導体基板2022

    • Inventor(s)
      山田 永
    • Industrial Property Rights Holder
      国立研究開発法人産業技術総合研究所
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      Products Report
    • Overseas
  • [Patent(Industrial Property Rights)] 化合物半導体基板2021

    • Inventor(s)
      山田 永
    • Industrial Property Rights Holder
      国立研究開発法人 産業技術総合研究所
    • Industrial Property Rights Type
      特許
    • Filing Date
      2021
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-03-27  

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