Patent ID: 11961765
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A method for manufacturing a semiconductor substrate, the method comprising:
(a) preparing an epitaxial substrate formed by epitaxially growing a nitride semiconductor layer on a first main surface of a growth substrate being a nitride semiconductor substrate and preparing a first support substrate, forming a resin adhesive layer between the first main surface of the growth substrate and a first main surface of the first support substrate, and bonding the epitaxial substrate to the first support substrate;
(b) removing, after the step (a), a second main surface of the growth substrate to a prescribed thickness to thin the growth substrate, the second main surface of the growth substrate being on a side opposite to the first main surface of the growth substrate on which the nitride semiconductor layer is formed;
(c) forming, after the step (b), a first protective thin film layer from the second main surface of the thinned growth substrate to side surfaces of the resin adhesive layer;
(d) forming, after the step (b), a second protective thin film layer from a second main surface of the first support substrate to the side surfaces of the resin adhesive layer, the second main surface of the first support substrate being on a side opposite to the first main surface of the first support substrate;
(e) removing, after the steps (c) and (d), the thinned growth substrate and exposing the nitride semiconductor layer;
(f) bonding, after the step (e), a second support substrate onto the nitride semiconductor layer; and
(g) removing, after the step (f), the first support substrate and the resin adhesive layer.