Patent ID: 11967530
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B  C  Y | IPC B  C  H

Claim 0:
1. A method for producing a GaN layered substrate, comprising the steps of:
subjecting a C-plane sapphire substrate having an off-angle of 0.5 to 5 degrees to a high-temperature nitriding treatment at 800° C. to 1,000° C. and/or a treatment for deposition of crystalline AlN on the C-plane sapphire substrate to carry out a surface treatment of the C-plane sapphire substrate;
carrying out epitaxial growth of GaN on the surface of the surface-treated C-plane sapphire substrate, so that a GaN film is formed on the surface of the surface-treated C-plane sapphire substrate, whereby a GaN film carrier having a surface of an N polar face is produced;
forming an ion implantation region by carrying out ion implantation on the GaN film of the GaN film carrier;
laminating and bonding a support substrate with a surface of the GaN film of the GaN film carrier, to which the ion implantation has been carried out; and
performing delamination at the ion-implanted region in the GaN film to transfer a GaN thin film onto the support substrate, to obtain a GaN layered substrate having, on the support substrate, the GaN thin film whose surface is a Ga polar face.