Patent ID: 6225207
Filing Date: 2001-05-01
Classification: H01L

Abstract:
A method of forming a structure on a substrate, the method comprising:a) depositing a first dielectric layer on the substrate;b) depositing a second dielectric layer on the first dielectric layer, wherein the first and second dielectric layers have dissimilar etching characteristics;c) depositing a third dielectric layer on the second dielectric layer;d) depositing a fourth dielectric layer on the third dielectric layer, wherein the first and fourth dielectric layers have dissimilar etching characteristics;e) depositing a fifth dielectric layer on the fourth dielectric layer, wherein the fifth dielectric layer has dissimilar etching characteristics with regard to the second and the fourth dielectric layers, and wherein the first and fifth dielectric layers have similar etching characteristics;f) simultaneously anisotropically etching a power line trench and a via pattern through the fifth, fourth and third dielectric layers, in a first etching sequence; andg) anisotropically etching a signal line trench, overlaying the via pattern, through the fifth dielectric layer, and anisotropically etching the via pattern to the substrate thereby forming a first via hole extending from the signal line trench to the substrate, in a second etching sequence, wherein the power line trench and the signal trench having an underlying via hole are adapted for forming a triple damascene structure.