Patent ID: 11908754
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method for controlling a profile of a critical dimension of a substrate, comprising:
forming a plurality of first features having a pre-process critical dimension on the substrate;
analyzing a profile of the pre-process critical dimension for the substrate;
analyzing a piece of apparatus data that indicates non-uniformity of the etching apparatus where the etching process is performed; and
performing an etching process on the substrate to form a plurality of second features on the substrate, wherein the second features correspond to the first features and have a post-process critical dimension that is related to the pre-process critical dimension;
wherein the substrate is rotated at a varying rotational speed during the etching process when the piece of apparatus data indicates that the etching apparatus is not uniform in terms of etching rates and when analysis of the profile of the pre-process critical dimension reveals a first condition that the pre-process critical dimension measured at a specific portion of the substrate that corresponds to a specific angular range of the substrate is greater than that measured at the remaining portions of the substrate on average.