Patent ID: 8603901
Filing Date: 2013-12-10
Classification: C30B,H01L

Abstract:
1. A method for producing a single crystal SiC substrate, comprising: a phosphorous ion introduction step for introducing phosphorous ions from a side of a surface Si layer into an SOI substrate in which the surface Si layer and an embedded oxide layer having a predetermined thickness are formed on an Si base material layer to convert the embedded oxide layer into an embedded glass layer to lower a softening point; and an SiC forming step for heating the SOI substrate having the embedded glass layer formed therein in an atmosphere of hydrocarbon-based gas to convert the surface Si layer into SiC, and thereafter, cooling the resulting substrate to form a single crystal SiC layer on a surface thereof, wherein the SiC forming step further comprises causing the embedded glass layer between the SiC layer and the Si base material layer to be transformed to cause slippage between the Si base material layer and the SiC layer, to accommodate a difference in shrinkage ratios between the SiC layer and the Si base material layer during performance of the method, heating and cooling to epitaxially grow the single crystal SiC layer, and thereby causing the embedded glass layer between the SiC layer and the Si base material layer to be transformed to cause slippage between the Si base material layer and the SiC layer, to suppress warp of the entire single crystal SiC substrate.