Patent ID: 11887851
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A method of forming a semiconductor device, the method comprising:
forming a film over a patterned top layer, the patterned top layer being on a mask layer, the mask layer being over a target layer, wherein openings extend through the patterned top layer to expose the mask layer, a first portion of the film over the patterned top layer has a first thickness, a second portion of the film on a bottom surface of the openings has a second thickness, and the first thickness is greater than the second thickness;
patterning the mask layer using the patterned top layer as a mask; and
using the patterned mask layer as a mask to pattern the target layer.