H - Electricity – 01 – L
Patent
H - Electricity
01
L
H01L 21/20 (2006.01) H01L 21/306 (2006.01) H01L 21/3065 (2006.01) H01L 21/762 (2006.01)
Patent
CA 2192630
The conventional fabrication processes of SOI substrate employed wet etching for removing a porous single-crystal Si region, but wet etching involved difficulties in management of concentration for fabricating SOI substrates in high volume, which caused reduction in productivity. Therefore, provided is a fabrication process of SOI substrate comprises a step of forming a non-porous single-crystal Si region on a surface of a porous single-crystal Si region of a single-crystal Si substrate having at least the porous single-crystal Si region, a step of bonding a support substrate through an insulating region to a surface of the non-porous single-crystal Si region, and a step of removing the porous single-crystal Si region, wherein the step of removing the porous single-crystal Si region comprises a step of performing dry etching in which an etch rate of the porous single-crystal Si region is greater than that of the non-porous single-crystal Si region.
Canon Kabushiki Kaisha
Ridout & Maybee Llp
LandOfFree
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