Growth of high-quality multicrystalline Si ingots using noncontact crucible method

Kazuo Nakajima, Kohei Morishita, Ryota Murai, Kentaro Kutsukake

研究成果: Contribution to journalArticle査読

29 被引用数 (Scopus)

抄録

Conventional crystal growth methods using silica crucibles cannot control the stress caused by expansion due to the solidification of the Si melt because crucible walls made of silica have insufficient flexibility to reduce the stress. In the case of crystal growth using a silicon nitride crucible, it was reported that an ingot can be more easily released from the crucible. A noncontact crucible method was proposed using conventional silica crucibles that reduces the stress and number of dislocations in Si multicrystalline ingots. We used the present method to grow wafers with only twin boundaries. An ingot with several grains and twin boundaries was realized using a crucible that had not been coated with Si 3N 4 particles. Several important characteristics were reported such as the presence of a low-temperature region in the Si melt, the possibility of growing large ingots with a diameter close to the crucible diameter, the minority carrier lifetime, the distribution of dislocations, the O concentration and the effect of Si 3N 4 particles on the crystal structure. Dislocations were almost undetectable in a large area of the cross section when a necking technique was used for the seed growth. The O concentration in ingots grown using crucibles coated with Si 3N 4 particles was lower than that in an ingot grown using a crucible without a coating of Si 3N 4 particles. A large ingot with a diameter of 25 cm was obtained using a crucible with a diameter of 33 cm.

本文言語英語
ページ(範囲)38-45
ページ数8
ジャーナルJournal of Crystal Growth
355
1
DOI
出版ステータス出版済み - 9 15 2012
外部発表はい

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 無機化学
  • 材料化学

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