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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:材料工程

Affiliation of Author(s):材料科学与工程学院

Issue:8

Page Number:33-38

ISSN No.:1001-4381

Abstract:The silicon ingots prepared by vacuum melting furnace with different pulling rates were analyzed by the variation of macrostructure and minority carrier lifetime along solidified height and radial direction, and the solid-liquid interface property during directional solidification process was investigated. The results showed that the minority carrier lifetime increased with the increased solidified height at first, and reached its maximum, then decreased. The radial distribution of the minority carrier lifetime was considered to be corresponding to the solid-liquid interface. From the minority carrier lifetime distribution, the solid-liquid interface curvature decreased with the decreased pulling rate, and solid-liquid interface morphology is the cellular interface. The calculated effective segregation coefficient of Fe was over three magnitudes than the equilibrium segregation coefficient due to the existence of the cellular interface.

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