Effect of reentrant twin corners on directional solidification of polycrystalline silicon

Hirofumi Miyahara, Seiko Nara, Keisaku Ogi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Title of host publicationConference Record of the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
    PublisherIEEE Computer Society
    Pages1219-1222
    Number of pages4
    ISBN (Print)1424400163, 9781424400164
    DOIs
    Publication statusPublished - Jan 1 2006
    Event2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4 - Waikoloa, HI, United States
    Duration: May 7 2006May 12 2006

    Publication series

    NameConference Record of the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
    Volume1

    Other

    Other2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
    Country/TerritoryUnited States
    CityWaikoloa, HI
    Period5/7/065/12/06

    All Science Journal Classification (ASJC) codes

    • Renewable Energy, Sustainability and the Environment
    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Materials Chemistry

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