Patent ID: 7285479

Claim:
A method for manufacturing a multilayered substrate for a semiconductor device comprising: forming locally a diamond layer on a first silicon substrate; forming an amorphous silicon layer on the diamond layer and the first silicon substrate and forming a silicon oxide layer on a second silicon substrate; bonding the diamond layer to the second silicon substrate with the amorphous silicon layer and the silicon oxide layer therebetween; removing the first silicon substrate by polishing while the polishing treatment is stopped when a surface of the diamond layer is exposed partially; removing the amorphous silicon layer by etching with an alkali solution through using the silicon oxide layer as a stop layer; removing the silicon oxide layer by etching with an solution containing hydrofluoric acid thereby forming locally a multilayered film composed of the silicon oxide layer, the amorphous silicon layer, and the diamond layer on the second silicon substrate; and forming a semiconductor layer on the diamond layer that is the uppermost layer of the multilayered film and on the region where the multilayered film is not present on the second silicon substrate.