4.4 Article

3D visualization of growth interfaces in cast Si ingot using inclusions distribution

Journal

JOURNAL OF CRYSTAL GROWTH
Volume 535, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jcrysgro.2020.125535

Keywords

Characterization; Interfaces; Growth from melt; Industrial crystallization; Semiconducting silicon; Solar cells

Funding

  1. Japan Science and Technology Agency (JST), CREST [JPMJCR17J1]
  2. German Federal Ministry for Economic Affairs and Energy [FKZ 0325823, 0324034]

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We propose a method of three-dimensional (3D) visualization of growth interfaces in crystalline ingots prepared by directional solidification and apply the method to cast silicon ingot for solar cells. The method consists of dispersing inclusions along with the growth interface by insertion of a quartz rod followed by measuring inclusions distribution by an infrared brick inspection system. Then, inclusions distribution can be visualized in 3D, which allows extracting growth interfaces as planes. By fitting the plane with a simple polynomial expression, its macroscopic shape and local gradient can be estimated. The method yields us the local changes in growth interfaces and thus contributes to the development of the crystal growth method for high-quality ingots.

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