Patent ID: 11929410
Assignee: SK HYNIX INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for fabricating a semiconductor device, comprising:
providing a substrate having a front surface and a rear surface opposite to the front surface;
forming a trench in the front surface of the substrate;
forming a gate dielectric layer over the trench;
forming a gate electrode that fills a bottom portion of the trench over the gate dielectric layer;
forming a sealing layer that includes a first portion covering the gate electrode, the gate dielectric layer, and the front surface of the substrate, and a second portion covering the rear surface of the substrate;
selectively removing the second portion of the sealing layer;
performing an annealing process to form a hydrogen treated surface on an interface between the trench and the gate dielectric layer; and
forming a capping layer that covers the rear and front surfaces of the substrate, after the performing of the annealing process.