Patent ID: 11955373
Assignee: SHANGHAI INSTITUTE OF MICROSYSTEM AND INFORMATION TECHNOLOGY, CHINESE ACADEMY OF SCIENCES
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for preparing a gallium oxide semiconductor structure, comprising following steps:
a step S1, providing a gallium oxide single-crystal wafer having an implantation surface, wherein the gallium oxide single-crystal wafer has a crystal orientation of (−201) or (001), the gallium oxide single-crystal wafer is Sn-doped or Fe-doped single-crystal wafer;
a step S2, performing an ion implantation into the implantation surface of the gallium oxide single-crystal wafer, such that implanted ions reach a preset depth and an implantation defect layer is formed at the preset depth, and a first gallium oxide layer and a second gallium oxide layer are formed on opposite sides of the implantation defect layer;
a step S3, bonding the implantation surface to a high thermal conductivity substrate to obtain a first composite structure including the gallium oxide single-crystal wafer and the high thermal conductivity substrate, wherein the implantation surface and the high thermal conductivity substrate are bonded via metal bonding or anodic bonding;
a step S4, performing an annealing treatment on the first composite structure such that the gallium oxide single-crystal wafer in the first composite structure is peeled off along the implantation defect layer, thereby obtaining a second composite structure and a third composite structure, wherein the implantation defect layer forms a first damaged layer and a second damaged layer, the second composite structure includes the first damaged layer, the first gallium oxide layer and the high thermal conductivity substrate, and the third composite structure includes the second damaged layer and the second gallium oxide layer;
a step S5, performing a surface treatment on the second composite structure to remove the first damaged layer, so as to obtain the gallium oxide semiconductor structure comprising the first gallium oxide layer and the high thermal conductivity substrate.