Effect of reentrant twin corners on directional solidification of polycrystalline silicon

Hirofumi Miyahara, Seiko Nara, Keisaku Ogi

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    2 被引用数 (Scopus)

    抄録

    The solidification microstructure and crystal orientation have been investigated for solar cell grade high purity polycrystalline silicon through a unidirectional solidification technique. In the solidification velocity range of 1.25 - 2.5 ×10-6m/s, the grain size enlarges as solidification progresses. Furthermore, large columnar grains contain many twin boundaries. However, in above the critical velocity around 40 ×10-6m/s, equiaxed structure appears. A model of two-dimensional nucleation on the reentrant corner was established, and the critical nucleus could be estimated to be 70 % to 80 % of the radius of the general two-dimensional nucleus. The reduction of the critical radius and undercooling on the reentrant corner could influence on the priority growth direction and the enlargement of the grain size.

    本文言語英語
    ホスト出版物のタイトルConference Record of the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
    出版社IEEE Computer Society
    ページ1219-1222
    ページ数4
    ISBN(印刷版)1424400163, 9781424400164
    DOI
    出版ステータス出版済み - 1 1 2006
    イベント2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4 - Waikoloa, HI, 米国
    継続期間: 5 7 20065 12 2006

    出版物シリーズ

    名前Conference Record of the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
    1

    その他

    その他2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
    国/地域米国
    CityWaikoloa, HI
    Period5/7/065/12/06

    All Science Journal Classification (ASJC) codes

    • 再生可能エネルギー、持続可能性、環境
    • 電子工学および電気工学
    • 電子材料、光学材料、および磁性材料
    • 材料化学

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