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Impact of thermal history on defects formation in the last solid fraction of Cz silicon ingots

Lanterne, Adeline Anne; Gaspar, Guilherme Manuel Morais; Haave, Bjørn; Jomâa, Moez; Søndenå, Rune; Hupfer, Alexander; Hu, Yu; Sabatino, Marisa Di
Peer reviewed, Journal article
Published version
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AIP+Conference+Proceedings2018-lanterne.pdf (1.678Mb)
Permanent lenke
https://hdl.handle.net/11250/2689918
Utgivelsesdato
2018
Metadata
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  • Publikasjoner fra CRIStin - SINTEF AS [4397]
  • SINTEF Industri [1142]
Originalversjon
10.1063/1.5049331
Sammendrag
For the first time, the impact of the tail detachment on the quality of the last solid fraction of a Czochralski silicon ingot body is reported. Simulations of the thermal history were performed on CGSim software and showed that producing an ingot with a tail detached from the melt before the cone-end (the so called “popped-out” tail) changes the time that the last part of the ingot body remains at the 900-1200°C temperature range and could thus impact the growth of defects such as oxygen precipitates. In addition, ingots with tails completely grown were characterized and compared to ingots with popped-out tails. Lifetime measurements of the ingot last solid fraction were performed while voids and oxygen related defects were delineated with chemical etchants. These measurements were complemented with FTIR measurements performed at room and low temperature (30 K), before a two-step thermal oxidation took place. The results show no impact of the earlier detachment from the melt on the as-grown lifetime, as long as the generation and propagation of dislocations due to the detachment are constrained inside the tail. However, after the thermal oxidation, lower oxygen stacking fault density is found in the popped-out ingots, highlighting a possible improvement of the Czochralski quality with shorter tails.
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AIP Publishing
Tidsskrift
AIP Conference Proceedings
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© 2018 Author(s)

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