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Crystal growth mechanism of large-domain BaSi2 films by close-spaced evaporation

Research Project

Project/Area Number 21K04136
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 InstitutionUniversity of Yamanashi

Principal Investigator

HARA Kosuke  山梨大学, 大学院総合研究部, 准教授 (40714134)

Project Period (FY) 2021-04-01 – 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 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywordsシリサイド半導体 / 近接蒸着 / 結晶成長
Outline of Research at the Start

BaSi2は結晶Siより高効率で安価な太陽電池を実現できる可能性がある新材料である。近接蒸着法により大きな結晶ドメインの薄膜を作製できるが、これまでは成膜温度の制約のため原因を調査できなかった。本研究では、原料を機械的に活性化し反応性を高める(メカノケミカル効果)ことで成膜温度の変更を可能にし、結晶成長メカニズムを調査する。また、得られた知見に基づき、結晶ドメインのさらなる拡大に取り組む。そして、巨大ドメイン薄膜を用いてドメイン境界の影響が少ない物性値の測定を目指す。

Outline of Final Research Achievements

The close-spaced evaporation (CSE) method is a deposition method for solar cell material BaSi2 with large-area scalability. This study aimed to elucidate the crystal growth mechanism of BaSi2 thin film by CSE, to fabricate single crystal BaSi2 thin film based on the obtained guidelines, and to reveal its physical properties. First, we succeeded in lowering the deposition temperature by 300 °C by mechanical activation of the raw material. By employing this technique, we investigated the impact of deposition temperature on the crystal domain structure. The results indicated that the domains expanded with an increase in substrate temperature and film thickness. Based on this knowledge, we successfully fabricated a single-crystal BaSi2 thin film on a vicinal Si(100) substrate for the first time. Physical properties measurements revealed that the influence of domain boundaries on carrier lifetime is not large.

Academic Significance and Societal Importance of the Research Achievements

本研究で実施した近接蒸着法への機械的活性化の利用は、おそらく初めて真空成膜プロセスにメカノケミカル効果を活用した成果である。これによって、薄膜結晶成長の分野に新たな手法を加えることができた。また、単結晶薄膜の作製と物性測定の成果は、結晶粒界の影響を排除した物性評価を可能とする成果である。これはより正確な物性の解明につながり、より高効率なBaSi2太陽電池の設計を可能とする。さらに、結晶ドメイン境界がキャリア寿命に大きな悪影響を及ぼさないことは、BaSi2の太陽電池応用において、結晶ドメインサイズに強い制約がないことを意味している。

Report

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

    (16 results)

All 2024 2023 2022 2021 Other

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (10 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Development of Close-Spaced Evaporation Technique for BaSi<sub>2</sub> Films toward Solar Cell Applications2023

    • Author(s)
      原康祐、山中淳二、有元圭介
    • Journal Title

      Vacuum and Surface Science

      Volume: 66 Issue: 7 Pages: 388-392

    • DOI

      10.1380/vss.66.388

    • ISSN
      2433-5835, 2433-5843
    • Year and Date
      2023-07-10
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Microstructural, electrical, and optoelectronic properties of BaSi2 epitaxial films grown on Si substrates by close-spaced evaporation2023

    • Author(s)
      Hara Kosuke O.、Takagaki Ryota、Arimoto Keisuke、Usami Noritaka
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 966 Pages: 171588-171588

    • DOI

      10.1016/j.jallcom.2023.171588

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Semiconducting BaSi<sub>2</sub> film synthesis by close-spaced evaporation benefiting from mechanical activation of source powder by ball milling2023

    • Author(s)
      Kosuke O. Hara, Chiaya Yamamoto, Junji Yamanaka, and Keisuke Arimoto
    • Journal Title

      JJAP Conference Proceedings

      Volume: 10 Issue: 0 Pages: 011101-011101

    • DOI

      10.56646/jjapcp.10.0_011101

    • ISSN
      2758-2450
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Silicon meets group-II metals in energy and electronic applications---How to handle reactive sources for high-quality films and bulk crystals2022

    • Author(s)
      T. Suemasu, K. O. Hara, H. Udono, and M. Imai
    • Journal Title

      Journal of Applied Physics

      Volume: 131 Issue: 19 Pages: 191101-191101

    • DOI

      10.1063/5.0092080

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Low temperature synthesis of photoconductive BaSi2 films via mechanochemically assisted close-spaced evaporation2021

    • Author(s)
      Hara Kosuke O.、Yamamoto Chiaya、Yamanaka Junji、Arimoto Keisuke
    • Journal Title

      Materials Advances

      Volume: 2 Issue: 20 Pages: 6713-6721

    • DOI

      10.1039/d1ma00687h

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 近接蒸着法による傾斜Si基板上への単一結晶方位BaSi2薄膜の形成2024

    • Author(s)
      原 康祐、牧 祐孝、類家 哉子、山中 淳二、有元 圭介
    • Organizer
      第71回応用物理学会春季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Small Negative Effect of Domain Boundary on Carrier Lifetime of BaSi2 Absorber Films2023

    • Author(s)
      Kosuke O. Hara, Ryota Takagaki, Keisuke Arimoto, and Noritaka Usami
    • Organizer
      The 34th International Photovoltaic Science and Engineering Conference (PVSEC-34)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Growth of Epitaxial BaSi2 Films with Carrier Lifetime over 2 μs by Close-Spaced Evaporation2023

    • Author(s)
      Kosuke O. Hara, Ryota Takagaki, Keisuke Arimoto, and Noritaka Usami
    • Organizer
      2023 International Conference on Solid State Devices and Materials (SSDM2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Heterojunction design by computational material screening for solar cells with BaSi2 absorber2023

    • Author(s)
      Kosuke O. Hara
    • Organizer
      11th International Conference on Materials for Advanced Technologies
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] BaSi2薄膜の結晶粒界とキャリア寿命の関係2023

    • Author(s)
      原 康祐、有元 圭介、宇佐美 徳隆
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Heterojunction Design Using Computational Material Screening for Solar Cells: Application to BaSi2 Absorber2023

    • Author(s)
      Kosuke O. Hara
    • Organizer
      2nd Indo-Japan Joint Workshop on Photovoltaics (IJWP-2023)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Computational material screening for charge transport layers of BaSi2 solar cells2022

    • Author(s)
      Kosuke O. Hara
    • Organizer
      The 33rd International Photovoltaic Science and Engineering Conference (PVSEC-33)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Synthesis of photoconductive BaSi2 films by close-spaced evaporation2022

    • Author(s)
      Kosuke O. Hara, Chiaya Yamamoto, Junji Yamanaka, Keisuke Arimoto
    • Organizer
      The 22nd International Vacuum Congress (IVC-22)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mechanochemically Assisted Close-Spaced Evaporation of BaSi2 Films2022

    • Author(s)
      Kosuke O. Hara, Chiaya Yamamoto, Junji Yamanaka, and Keisuke Arimoto
    • Organizer
      The 6th Asia-Pacific Conference on Green Technology with Silicides and Related Materials, 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Si基板上BaSi2近接蒸着膜の実効キャリア寿命2022

    • Author(s)
      原 康祐、高垣 僚太、有元 圭介、宇佐美 徳隆
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Research-status Report
  • [Remarks] 原研究室ホームページ

    • URL

      http://www.inorg.yamanashi.ac.jp/hara-lab/

    • Related Report
      2022 Research-status Report 2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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