Patent ID: 11955563
Assignee: WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 4:
5. The manufacturing method of the thin film transistor according to claim 4, wherein the step of forming the gate dielectric layer arranged above the channel region further comprises:
forming a sacrificial dielectric layer above the channel region, wherein the sacrificial dielectric layer is made of silicon oxide or silicon nitride, and thickness of the sacrificial dielectric layer is greater than or equal to twice of thickness of the gate dielectric layer; and
polishing the sacrificial dielectric layer by chemical mechanical polishing, wherein a part of the sacrificial dielectric layer is removed, such that thickness of remaining sacrificial dielectric layer is equal to the thickness of the gate dielectric layer for forming the gate dielectric layer;
wherein a surface of the gate dielectric layer is a polished surface.