Patent ID: 7244672
Filing Date: 2007-07-17
Classification: H01L

Abstract:
1. A method of fabricating a damascene structure, comprising: (a) forming a barrier layer on a substrate having a metal layer thereon; (b) forming a first organosilicate layer on the barrier layer; (c) forming a silicon oxide layer on the first organosilicate layer; (d) forming a second organosilicate layer on the silicon oxide layer; (e) etching the second organosilicate layer to define vias therein, wherein the second organosilicate layer is etched with a hydrogen-containing fluorocarbon gas mixture; (f) etching the silicon oxide layer with a fluorocarbon gas mixture to transfer the vias defined in the second organosilicate layer therethrough; (g) patterning the second organosilicate layer to define interconnects therethrough, wherein the interconnects are positioned over the vias, and wherein the via pattern is transferred through the first organosilicate layer when the interconnects are defined in the second organosilicate layer; and (h) filling the vias and interconnects with a conductive material.