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Efficiency improvement of semiconductor photocatalysts by multi-dimensional band endineering

Research Project

Project/Area Number 21H04551
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 21:Electrical and electronic engineering and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Sugiyama Masakazu  東京大学, 先端科学技術研究センター, 教授 (90323534)

Co-Investigator(Kenkyū-buntansha) 山口 信義  東京大学, 先端科学技術研究センター, 助教 (30910070)
嶺岸 耕  東京大学, 先端科学技術研究センター, 准教授 (40512992)
Project Period (FY) 2021-04-05 – 2024-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥42,900,000 (Direct Cost: ¥33,000,000、Indirect Cost: ¥9,900,000)
Fiscal Year 2023: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Fiscal Year 2022: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2021: ¥21,970,000 (Direct Cost: ¥16,900,000、Indirect Cost: ¥5,070,000)
Keywords光触媒 / GaN / 接合界面 / 水素製造 / キャリアダイナミクス / 水分解 / 半導体単結晶 / バンドアラインメント / 半導体 / 表面修飾 / 太陽光水素製造 / 半導体光触媒 / 光起電力
Outline of Research at the Start

低コストな太陽光水素製造を実現しうる粒子状光触媒の高効率化指針を得るため,単結晶半導体基板をベースに半導体微細加工技術を駆使して各種バンドエンジニアリングを施した光電極をモデル系とし,電流-電位特性,電極の電位の照射光強度依存性,in situ観察(フォトルミネッセンスや電位顕微鏡解析)を統合した解析を展開する.これにより,光触媒表面で電子と正孔の反応チャネルを空間分離する多次元バンドアラインメントの構築指針を確立する.これをもとに粒子状光触媒に適用可能な表面修飾プロセスを構築し,STH効率10%以上の達成に資する.

Outline of Final Research Achievements

The electrical conductivity between the Pt electrode and n-type GaN was measured on a model photocatalyst consisting of a Pt comb electrode as an auxiliary catalyst on an n-type GaN single-crystal thin film. The results show that the GaN-Pt junction is initially Schottky and has an energy barrier for electron transfer, but changes to an ohmic contact when hydrogen accumulates in the atmosphere due to solar water splitting. Furthermore, the potentials of Pt comb electrodes and n-type GaN were measured individually while modulating the intensity of excitation light, and it was confirmed that even in a hydrogen atmosphere, photovoltaic energy is generated in the direction that prevents water splitting reaction, which inhibits highly efficient photocatalytic operation. However, the insertion of a Ti layer between Pt and n-type GaN can increase the hydrogen production rate by several times.

Academic Significance and Societal Importance of the Research Achievements

カーボンニュートラルを実現するために不可欠なグリーン水素を太陽光のエネルギーによって低コストに製造する技術の鍵を握る光触媒について,その高効率化を従来の物質探索的なアプローチではなく,半導体材料やデバイス物理に立脚したメカニズムの理解をもとに進めるためのケーススタディーを提示した.

Report

(5 results)
  • 2024 Final Research Report ( PDF )
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • 2021 Comments on the Screening Results   Annual Research Report
  • Research Products

    (19 results)

All 2025 2024 2023 2022 2021

All Journal Article (6 results) (of which Peer Reviewed: 6 results) Presentation (13 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Journal Article] Efficient hydrogen evolution from water over a thin film photocathode composed of solid solutions with a composition gradient of ZnTe and CdTe2024

    • Author(s)
      Veiga Lionel S.、Kumagai Hiromu、Sugiyama Masakazu、Minegishi Tsutomu
    • Journal Title

      Sustainable Energy and Fuels

      Volume: 8 Issue: 10 Pages: 2210-2218

    • DOI

      10.1039/d4se00067f

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Efficient hydrogen evolution from water over a thin film photocathode composed of solid solutions with a composition gradient of ZnTe and CdTe2024

    • Author(s)
      Lionel S. Veiga, Hiromu Kumagai, Masakazu Sugiyama, Tsutomu Minegishi
    • Journal Title

      Sustainable Energy and Fuels

      Volume: -

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Solar to hydrogen efficiency of 28.2% under natural sunlight achieved by a combination of five-junction concentrator photovoltaic modules and electrolysis cells2023

    • Author(s)
      Yamaguchi Shingi、Watanabe Kentaroh、Minegishi Tsutomu、Sugiyama Masakazu
    • Journal Title

      Sustainable Energy & Fuels

      Volume: 7 Issue: 6 Pages: 1377-1381

    • DOI

      10.1039/d2se01754g

    • Related Report
      2023 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ambient Sensitive Charge Transfer from GaN to Pt during a Photocatalytic Reaction2022

    • Author(s)
      Endo Tatsuro、Minegishi Tsutomu、Shizumi Soraya、Sugiyama Masakazu
    • Journal Title

      The Journal of Physical Chemistry Letters

      Volume: 13 Issue: 18 Pages: 3978-3982

    • DOI

      10.1021/acs.jpclett.2c00766

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Efficient hydrogen evolution from water over thin film photocathode composed of solid solutions between ZnSe and Cu(In, Ga)Se<sub>2</sub> with composition gradient2021

    • Author(s)
      Minegishi Tsutomu、Yamaguchi Shingi、Sugiyama Masakazu
    • Journal Title

      Applied Physics Letters

      Volume: 119 Issue: 12 Pages: 123905-123905

    • DOI

      10.1063/5.0064658

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] In-Situ Photoluminescence Analysis of GaN Photoanode During Water Oxidation2021

    • Author(s)
      T. Minegishi, S.; Shizumi, O. Ciftci, T. Endo, Y. Imazeki, Y. Pihosh, M. Sugiyama
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: in press Issue: 19 Pages: 10493-10499

    • DOI

      10.1021/acs.jpcc.1c02005

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] 粒子転写法を用いて作製したBiVO4光電極におけるコンタクト層金属の影響2025

    • Author(s)
      宮村 純司、Veiga Lionel Sebastian、関 良朝、浅見 明太、嶺岸 耕、杉山 正和
    • Organizer
      電気化学会第92回大会 2025年3月18日, 東京農工大学小金井キャンパス
    • Related Report
      2023 Annual Research Report
  • [Presentation] CdTe-based particulate photocathode for hydrogen evolution reaction from water2024

    • Author(s)
      ベイガ リオネルセバスチアン、杉山 正和、嶺岸 耕
    • Organizer
      電気化学会第91回大会, 2024年3月14日,名古屋大学東山キャンパス
    • Related Report
      2023 Annual Research Report
  • [Presentation] NIR light responsive photocathode of CdTe-ZnTe solid solutions with a composition gradient for hydrogen evolution2024

    • Author(s)
      ベイガ リオネルセバスチアン、杉山 正和、嶺岸 耕
    • Organizer
      第44回水素エネルギー協会(HESS)大会, 2024年12月6日, タワーホール船堀
    • Related Report
      2023 Annual Research Report
  • [Presentation] CdTe-based particulate photocathode for hydrogen evolution reaction from water2024

    • Author(s)
      ベイガ リオネルセバスチアン、杉山 正和、嶺岸 耕
    • Organizer
      電気化学会第91回大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Back contact modification on CdTe-based photocathode for efficient hydrogen evolution under simulated sunlight2023

    • Author(s)
      Veiga Lionel Sebastian、嶺岸 耕、熊谷 啓、杉山 正和
    • Organizer
      電化学秋季大会, 2023年9月11日,九州大学伊都キャンパス
    • Related Report
      2023 Annual Research Report
  • [Presentation] Efficient Solar-to-hydrogen Conversion System by Using 5-junction Concentrator Photovoltaic Module2023

    • Author(s)
      Min Jiang、Shingi Yamaguchi、Kentaroh Watanabe、Tsutomu Minegishi、Masakazu Sugiyama
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Back contact modification on CdTe-based photocathode for efficient hydrogen evolution under simulated sunlight2023

    • Author(s)
      Veiga Lionel Sebastian、嶺岸 耕、熊谷 啓、杉山 正和
    • Organizer
      電気化学秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] (Photo)electrochemical Cells for Hydrogen and Hydrocarbon Production2022

    • Author(s)
      Tsutomu Minegishi
    • Organizer
      MATERIALS SCIENCE& ENGINEERING 3rd INTERNATIONAL CONFERENCE
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] (Photo)Electrochemical Cells for Hydrogen Production and Carbon Dioxide Utilization2022

    • Author(s)
      Tsutomu Minegishi
    • Organizer
      Electrochemical Society meeting 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 水素生成用(ZnSe)x(Cu(In, Ga)Se2)1-x光カソードにおける組成傾斜の効果2022

    • Author(s)
      嶺岸 耕、山口 信義、杉山 正和
    • Organizer
      電気化学秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] GaNモデル光触媒-Pt助触媒間におけるオーム性接触形成の効果2022

    • Author(s)
      落合 貴也、山口 信義、杉山 正和、嶺岸 耕
    • Organizer
      電気化学秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 単結晶窒化ガリウム基板を用いた光電極表面におけるキャリア移動機構の解明2022

    • Author(s)
      落合 貴也,山口 信義, 嶺岸 耕
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Light-induced open-circuit potential to explore the quality of semiconductor photoelectrodes for solar water splitting2021

    • Author(s)
      Masakazu Sugiyama, Yuki Imazeki, Supawan Ngamprapawat, Masahiro Sato, Tsutomu Minegishi, Katsushi Fujii
    • Organizer
      THERMEC 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2021-04-28   Modified: 2026-01-16  

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