Shape and quality of Si single bulk crystals grown inside Si melts using the noncontact crucible method

The noncontact crucible method enables production of Si bulk single crystals without crucible contact by intentionally establishing a distinct low-temperature region in the Si melt. In this contribution, we correlate crystal growth conditions to crystal material properties. The shape of the growing...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2015-01, Vol.54 (1), p.15504-1-015504-7
Main Authors: Nakajima, Kazuo, Murai, Ryota, Ono, Satoshi, Morishita, Kohei, Kivambe, Maulid M., Powell, Douglas M., Buonassisi, Tonio
Format: Article
Language:English
Subjects:
Crucibles
Crystal growth
Crystals
Dislocation density
Dislocations
Electrical resistivity
Ingots
Melts (crystal growth)
Silicon
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Summary:The noncontact crucible method enables production of Si bulk single crystals without crucible contact by intentionally establishing a distinct low-temperature region in the Si melt. In this contribution, we correlate crystal growth conditions to crystal material properties. The shape of the growing interface was generally convex in the growth direction. The quality of the Si ingots was determined by the spatial distributions of dislocations, resistivity, oxygen concentration, and minority-carrier lifetime. In an ingot with a convex bottom, swirl patterns with higher resistivity are present in the top, middle, and bottom of the ingot. The dislocation density decreased from the top (first to solidify) to the bottom of the ingot because dislocations in the ingot moved to the periphery from the center of the ingot during crystal growth owing to the convex growing interface. The oxygen concentration was concentrically distributed on the seed axis owing to the convex growing interface. The lifetime was as high as 1.8 ms after phosphorus diffusion gettering (PDG) and 205 µs before PDG at an injection level of 1 × 1015 cm−3. The lifetime was not strongly affected by the dislocation density, which was as low as 102-103 cm−2.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.54.015504