czochralski process
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2021 ◽  
Vol 573 ◽  
pp. 126299
Author(s):  
Shota Kato ◽  
Sanghong Kim ◽  
Masahiko Mizuta ◽  
Masanori Oshima ◽  
Manabu Kano

Author(s):  
Masahiro Shimizu ◽  
Kohei Kimoto ◽  
Takuya Kawai ◽  
Toshinori Taishi ◽  
Susumu Arai

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1077
Author(s):  
Hye Jun Jeon ◽  
Hyeonwook Park ◽  
Ganesh Koyyada ◽  
Salh Alhammadi ◽  
Jae Hak Jung

Here, we report a successfully modified Czochralski process system by introducing the cooling system and subsequent examination of the results using crystal growth simulation analysis. Two types of cooling system models have been designed, i.e., long type and double type cooling design (LTCD and DTCD) and their production quality of monocrystalline silicon ingot was compared with that of the basic type cooling design (BTCD) system. The designed cooling system improved the uniformity of the temperature gradient in the crystal and resulted in the significant decrease of the thermal stress. Moreover, the silicon monocrystalline ingot growth rate has been enhanced to 18% by using BTCD system. The detailed simulation results have been discussed in the manuscript. The present research demonstrates that the proposed cooling system would stand as a promising technique to be applied in CZ-Si crystal growth with a large size/high pulling rate.


Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 996
Author(s):  
Jingwei Li ◽  
Juncheng Li ◽  
Yinhe Lin ◽  
Jian Shi ◽  
Boyuan Ban ◽  
...  

Separation of refined silicon from Al–Si melt is still a puzzle for the solvent refining process, resulting in considerable waste of acid and silicon powder. A novel modified Czochralski method within the Al–Si alloy is proposed. After the modified Czochralski process, a large amount of refined Si particles was enriched around the seed crystalline Si and separated from the Al–Si melt. As for the Al–28%Si with the pulling rate of 0.001 mm/min, the recovery of refined Si in the pulled-up alloy (PUA) sample is 21.5%, an improvement of 22% compared with the theoretical value, which is much larger 1.99 times than that in the remained alloy (RA) sample. The content of impurities in the PUA is much less than that in the RA sample, which indicates that the modified Czochralski method is effective to improve the removal fraction of impurities. The apparent segregation coefficients of boron (B) and phosphorus (P) in the PUA and RA samples were evaluated. These results demonstrate that the modified Czochralski method for the alloy system is an effective way to enrich and separate refined silicon from the Al–Si melt, which provide a potential and clean production of solar grade silicon (SoG-Si) for the future industrial application.


2020 ◽  
Vol 53 (2) ◽  
pp. 11710-11715 ◽  
Author(s):  
Halima Zahra Bukhari ◽  
Morten Hovd ◽  
Muhammad Faisal Aftab ◽  
Jan Winkler

Crystals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 18 ◽  
Author(s):  
Wolfram Miller ◽  
Nikolay Abrosimov ◽  
Jörg Fischer ◽  
Alexander Gybin ◽  
Uta Juda ◽  
...  

A numerical scheme was developed to compute the thermal and stress fields of the Czochralski process in a quasi-time dependent mode. The growth velocity was computed from the geometrical changes in melt and crystal due to pulling for every stage, for which the thermal and stress fields were computed by using the open source software Elmer. The method was applied to the Czochralski growth of Ge crystals by inductive heating. From a series of growth experiments, we chose one as a reference to check the validity of the scheme with respect to this Czochralski process. A good agreement both for the shapes of the melt/crystal interface at various time steps and the change in power consumption with process time was observed.


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