Patent ID: 6096637
Filing Date: 2000-08-01
Classification: H01L

Abstract:
The method of forming an electromigration resistant region for an interconnection structure comprising the steps of:a) depositing a first Ti layer;b) depositing a first Al layer on the first layer;c) capping the first Al layer with a first antireflective capping layer;d) patterning the first Ti layer, the first Al layer, and the first antireflective capping layer to form a first conductive line;e) depositing an insulating layer over the first conductive line;f) depositing a conformal coating over the insulating layer;g) planarizing the insulating layer using chemical and mechanical polishing CMP;h) forming a second insulating capping layer over the conformal coating to get the second insulating layer to a predetermined thickness;i) forming a via through a region of the insulating layer to the first conductive line;j) depositing a first adhesion-promoting coating over the via to form a liner in the via;k) heat treating the liner to form an electromigration resistant intermetallic region at an interface between the liner and the first conductive line;l) depositing W over and into the via;m) etching the deposited W to leave a W plug in the via;n) depositing a second underlayer over the W plug;o) depositing a second Al layer over the second underlayer;p) capping the second Al layer with a second antireflective layer; andq) patterning the second underlayer, the second aluminum layer and the second antireflective layer to form a second conductive line.