Patent ID: 6831007
Filing Date: 2004-12-14
Classification: H01L

Abstract:
A method for forming a metal line of an Al/Cu structure, the method comprising the steps of:sequentially forming a first buffer layer, a first metal layer, and a second buffer layer on an insulating substrate; forming grooves by selectively etching the second buffer layer and the first metal layer in a region where the metal line will be formed; forming a third buffer layer on an entire surface; filling the grooves with a second metal layer having a lower electrical resistance and a higher resistance to electro-migration characteristic than the first metal layer; entirely etching the second metal layer and the third buffer layer on the second buffer layer; and forming a metal line having a layered structure of the first buffer layer, the first metal layer, the third buffer layer, and the second metal layer by selectively etching the third buffer layer, the second buffer layer, the first metal layer and the first buffer layer using the second metal layer as a mask.