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Study on melt growth mechanisms of multicrystalline silicon by in situ observations(Fostering Joint International Research)

Research Project

Project/Area Number 15KK0198
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research)

Allocation TypeMulti-year Fund
Research Field Crystal engineering
Research InstitutionTohoku University

Principal Investigator

Fujiwara Kozo  東北大学, 金属材料研究所, 教授 (70332517)

Research Collaborator Miller Wolfram  Leibniz-Institute for Crystal Growth, Researcher
Project Period (FY) 2016 – 2018
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Keywords結晶成長 / 固液界面 / 太陽電池 / その場観察 / シリコン多結晶 / 融液成長 / シリコン
Outline of Final Research Achievements

The objective of this collaborative study is to fundamentaly clarify the melt growth mechanisms of multicrystalline silicon (mc-Si) which is widely used for solar cells. There are variety types of crystal defects, which degrade the solar cell performance, in mc-Si wafers. In this study, we directly observed the crystal growth behaviors of mc-Si at around 1400℃ to clarify how crystalline defects are formed at a crystal/melt interface during crystal growth from the melt by using an in situ observation system. Further, those mechanisms were theoretically clarified in the Institute for Crystal Growht (IKZ) in Germany. Based on the fundamental research results of crystal growth, we developed the growth technology of mc-Si ingot.

Academic Significance and Societal Importance of the Research Achievements

太陽電池のエネルギー変換効率を向上させるためには、基板材料であるSi多結晶の高品質化が不可欠である。Si多結晶基板中には、様々な結晶欠陥が存在しており、それらが太陽電池特性を低下させる要因となっている。結晶欠陥が少ない高品質なSi多結晶を製造するためには、結晶欠陥がSi多結晶の結晶成長過程にどのようなメカニズムで形成されるのかを基礎的に明らかにしなければならない。本研究では、独自に開発した装置を用いた実験(東北大)と理論(IKZ、ドイツ)により、Si多結晶中の結晶欠陥の様々な挙動を明らかにした。これらの成果は、結晶成長学の発展に貢献するだけでなく、Si多結晶の高品質化において有用な知見となる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (20 results)

All 2019 2018 2017 2016 Other

All Int'l Joint Research (1 results) Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results) Presentation (13 results) (of which Int'l Joint Research: 3 results,  Invited: 7 results) Book (1 results) Remarks (1 results)

  • [Int'l Joint Research] Leibniz Institute for Crystal Growth (IKZ)(ドイツ)2016

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Origin of small-angle grain boundaries during directional solidification in multicrystalline silicon2018

    • Author(s)
      L. C. Chuang, K. Maeda, H. Morito, K. Shiga, K. Fujiwara
    • Journal Title

      Materialia

      Volume: 3 Pages: 347-352

    • DOI

      10.1016/j.mtla.2018.08.034

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] In situ observation of grain-boundary development from a facet-facet groove during solidification of silicon2018

    • Author(s)
      K. K. Hu, K. Maeda, H. Morito, K. Shiga, K. Fujiwara
    • Journal Title

      Acta Materialia

      Volume: 153 Pages: 186-192

    • DOI

      10.1016/j.actamat.2018.04.062

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] In situ observation of interaction between grain boundaries during directional solidification of Si2018

    • Author(s)
      L. C. Chuang, K. Maeda, H. Morito, K. Shiga, W. Miller, K. Fujiwara
    • Journal Title

      Scripta Materialia

      Volume: 148 Pages: 37-41

    • DOI

      10.1016/j.scriptamat.2018.01.020

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] In situ observation of twin boundary formation at grain-boundary groove during directional solidification of Si2017

    • Author(s)
      K. FUjiwara, R. Maeda, K. Maeda, H. Morito
    • Journal Title

      Scripta Materialia

      Volume: 133 Pages: 65-69

    • DOI

      10.1016/j.scriptamat.2017.02.028

    • Related Report
      2017 Research-status Report 2016 Research-status Report
    • Peer Reviewed
  • [Presentation] In situ observation of interaction between grain boundaries during directional solidification of Si2019

    • Author(s)
      L. C. Chuang, K. Maeda, H. Morito, K. Shiga, W. Miller, K. Fujiwara
    • Organizer
      3rd German Polish Conference on Crystal Growth
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Influence of grain boundary dislocations on the direction of a small-angle grain boundary in multicrystalline silicon during directional solidification2018

    • Author(s)
      L. C. Chuang
    • Organizer
      International Symposium & School on Crystal Growth Fundamentals
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Origin of small-angle grain boundaries during directional solidification in multicrystalline silicon2018

    • Author(s)
      荘 履中、前田健作、森戸春彦、志賀敬次、藤原航三
    • Organizer
      日本金属学会2018年秋期講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Moving direction of grain boundary during directional solidification of mc-Si2018

    • Author(s)
      胡 寛侃、前田健作、森戸春彦、志賀敬次、藤原航三
    • Organizer
      日本金属学会2018年秋期講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Moving direction of grain boundary during directional solidification of mc-Si2018

    • Author(s)
      K. K. Hu
    • Organizer
      IKZ Colochium
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Interaction between grain boundaries at the crystal/melt interface of mc-Si2018

    • Author(s)
      L. C. Chuang
    • Organizer
      IKZ Colochium
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Interactions between small-angle grain boundaries and Σ3 twin boundaries during solidification of multi-Crystalline silicon2018

    • Author(s)
      荘履中、前田健作、森戸春彦、志賀敬次、藤原航三
    • Organizer
      日本金属学会2018年春期(第162回)講演大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Si多結晶の凝固過程における双晶形成に固液界面形状が及ぼす影響2018

    • Author(s)
      前田亮一、前田健作、志賀敬次、森戸春彦、藤原航三
    • Organizer
      日本金属学会2018年春期(第162回)講演大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Morphological transformation of crystal/melt interface of Si2017

    • Author(s)
      Kozo Fujiwara
    • Organizer
      Institut Matériaux Microélectronique Nanosciences de Provence(IM2NP)セミナー
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Si多結晶の固液界面における双晶界面の形成機構2017

    • Author(s)
      前田亮一、前田健作、森戸春彦、志賀敬次、藤原航三
    • Organizer
      第46回結晶成長国内会議(JCCG-46)
    • Related Report
      2017 Research-status Report
  • [Presentation] Interactions between grain boundaries during solidification of multicrystalline silicon2017

    • Author(s)
      荘 履中、前田健作、森戸春彦、志賀敬次、藤原航三
    • Organizer
      第46回結晶成長国内会議(JCCG-46)
    • Related Report
      2017 Research-status Report
  • [Presentation] Siの融液成長挙動のその場観察2017

    • Author(s)
      藤原航三
    • Organizer
      日本鉄鋼協会第174回秋季講演大会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Morphological transformation of crystal/melt interface of silicon2016

    • Author(s)
      Kozo Fujiwara
    • Organizer
      2016 Russia-Japan Conference "Advanced Materials: Synthesis, Processing and Properties of Nanostructures"
    • Place of Presentation
      Novosibirsk State University, Russia
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Book] Handbook of Photovoltaic Silicon2019

    • Author(s)
      Kozo FUJIWARA (チャプター分担執筆)
    • Total Pages
      1200
    • Publisher
      Springer
    • ISBN
      9783662564714
    • Related Report
      2017 Research-status Report
  • [Remarks] 藤原研究室

    • URL

      http://www.xtalphys.imr.tohoku.ac.jp/

    • Related Report
      2016 Research-status Report

URL: 

Published: 2016-10-04   Modified: 2020-03-30  

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