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Development of efficient green-light emitting diode based on band folding

Research Project

Project/Area Number 20K15170
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

Hanzawa Kota  東京工業大学, 科学技術創成研究院, 助教 (30849526)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2020: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords半導体 / 薄膜成長 / 光物性 / ペロブスカイト / 硫化物 / 窒化物 / 結晶工学 / エピタキシャル成長 / 光電子物性 / カルコゲナイド / 薄膜 / 発光
Outline of Research at the Start

現在商業的に用いられるIII-V族半導体をベースとした発光ダイオードは緑色波長領域において、発光量子効率が激減するグリーンギャップ問題を抱えている。申請者は非結合性軌道とバンドフォールディングに着目した全く新しい化学的材料設計指針に基づき、ペロブスカイト型硫化物半導体SrHfS3において優れた緑色発光特性とn/p型キャリア制御性を見いだした。そこで本研究では、このエピタキシャル薄膜並びにpnホモ接合を作製し、SrHfS3のLED特性を評価する。

Outline of Final Research Achievements

In this research project, we focused on non-oxide compounds with distorted perovskite-type structures owing to their superior electronic structures such as band folding for optoelectronic property and aimed to develop highly-efficient optical semiconductor devices. To realize the efficient device properties, it is essential to fabricate the high quality epitaxial thin films. For sulfide semiconductor SrHfS3 with outstanding optoelectronic characteristics and nitride compound LaWN3, which is a candidate of novel ferroelectric semiconductor, we developed the epitaxial thin-film growth processes and consequently succeeded in fabrications of the epitaxial films by pulsed laser deposition and magnetron sputtering techniques.

Academic Significance and Societal Importance of the Research Achievements

本研究では、光エネルギー変換材料の候補物質であるペロブスカイト型硫化物と窒化物の可能性を評価するためのファーストステップとして、エピタキシャル薄膜の作製を行った。光半導体デバイスなどにおいて、エピタキシャル薄膜を用いることが高効率化の必要条件であるため、デバイス作製の前段階として高品質なエピタキシャル薄膜を作製するプロセスを確立したことは学術的、また社会的にも意義が深く、重要な進歩と言える。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (4 results)

All 2024 2023 2020

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

  • [Journal Article] Heteroepitaxial Growth, Degenerate State, and Superconductivity of Perovskite-Type LaWN3 Thin Films2023

    • Author(s)
      Kota Hanzawa, Hidenori Hiramatsu
    • Journal Title

      ACS Applied Electronic Materials

      Volume: 5 Issue: 5 Pages: 2793-2798

    • DOI

      10.1021/acsaelm.3c00249

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Extraordinary Strong Band‐Edge Absorption in Distorted Chalcogenide Perovskites2020

    • Author(s)
      Nishigaki Yukinori、Nagai Takayuki、Nishiwaki Mitsutoshi、Aizawa Takuma、Kozawa Masayuki、Hanzawa Kota、Kato Yoshitsune、Sai Hitoshi、Hiramatsu Hidenori、Hosono Hideo、Fujiwara Hiroyuki
    • Journal Title

      Solar RRL

      Volume: 4 Issue: 5 Pages: 1900555-1900555

    • DOI

      10.1002/solr.201900555

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Heteroepitaxial Growth of a Perovskite Type Nitride2024

    • Author(s)
      Kota Hanzawa and Hidenori Hiramatsu
    • Organizer
      13th The International Conference on the Science and Technology for Advanced Ceramics (STAC13)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The 3rd International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJI2MA-3)2023

    • Author(s)
      Kota Hanzawa, Yu Toriumi, Tatsuya Sano, and Hidenori Hiramatsu
    • Organizer
      Thin Film Growth and Characterization of Functional Nitride Semiconductors
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2025-01-30  

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