Patent ID: 9385000
Filing Date: 2016-07-05
CPC Classification: H01L

Claim Text:
1. A method of performing an etching process, comprising: providing a substrate, wherein a first region and a second region are defined on the substrate, and an overlapping region of the first region and the second region is defined as a third region, and the third region is not equal to the first region or the second region; forming a dielectric layer having a first trench in the first region, wherein the dielectric layer comprises a first dielectric layer and a second dielectric layer, the first trench penetrates the first dielectric layer and does not penetrate the second dielectric layer; forming a tri-layer structure comprising an organic layer, a bottom anti-reflection coating (BARC) layer, and a photoresist layer sequentially on the substrate; removing the photoresist layer and the BARC in the second region; and performing an etching process to remove the organic layer in the second region by using the BARC layer and/or the photoresist layer as a mask, wherein the etching process uses an etchant comprises CO after the etching process, performing a second etching process to only remove the second dielectric layer in the third region to expose a contact of a semiconductor structure under the second dielectric layer.