Patent ID: 6180516
Filing Date: 2001-01-30
Classification: H01L

Abstract:
A method of forming a dual damascene structure, comprising the steps of:forming a dielectric layer having a first conductive layer formed therein on a dielectric layer;forming a first photoresist layer having a first opening therein;using the first photoresist layer as an etching mask and etching the dielectric layer to form a trench with a predetermined depth;forming a titanium layer over the dielectric layer to cover the first photoresist layer and the dielectric layer;forming a second photoresist layer having a second opening therein on the titanium layer, wherein the first opening and the second opening are overlapped to etch other;using the second photoresist layer and the first photoresist layer as masks and etching the titanium layer and the dielectric layer until exposing the first conductive layer to from a via hole;removing the first photoresist layer and the second photoresist layer; wherein the titanium layer is removed simultaneously;forming a second conductive layer to fill the via hole and the trench; andplanarizing the second conductive layer until exposing the dielectric layer.