Si multicrystals grown by the Czochralski method with multi-seeds

Takeshi Hoshikawa, Toshinori Taishi, Xinming Huang, Satoshi Uda, Muneyoshi Yamatani, Katsuhiko Shirasawa, Keigo Hoshikawa

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Si multicrystals with several large grains have been grown by the Czochralski (CZ) method with multiple seeds using semiconductor-grade high-purity Si raw material in order to investigate the influence of defects such as dislocations and sub-grain-boundaries on the minority carrier lifetime. Two or three single-crystal Si seeds with [1 0 0], [1 1 0] and [1 1 0] orientations were used for the growth. It was found that the minority carrier lifetime in the Si multicrystals decreased considerably in the region of grains near the semicoherent interfaces with others, e.g., interfaces between [2 3 2] and [1 1 1] grains, [1 0 0] and [1 1 1] grains, and [1 1 0] and [1 1 1] grains. Numerous dislocations with densities as high as 106/cm2 in these grains moved to align and generate sub-grain boundaries by the shear stress caused by the semicoherence near the interfaces, which was determined to be responsible for the decrease in the minority carrier lifetime.

Original languageEnglish
Pages (from-to)466-471
Number of pages6
JournalJournal of Crystal Growth
Volume307
Issue number2
DOIs
Publication statusPublished - 2007 Sep 15

Keywords

  • A1. Dislocations
  • A1. Minority carrier lifetime
  • A1. Sub-grain-boundary
  • A2. Czochralski method
  • A2. Multicrystal growth
  • B2. Si crystal

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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