Patent ID: 6677227
Filing Date: 2004-01-13
Classification: B81B,H01L

Abstract:
A method of forming a contact for connecting to a circuit having a conductor accessible through a contact via in an insulating layer deposited on a substrate, the method comprising the steps of,via layer depositing and patterning a via layer over the insulating layer, the via layer having a flange via over the contact via, conducting layer depositing a conducting layer over the via layer, the conducting layer being deposited onto the conductor through the contact via and the flange via, the conducting layer forming a stepped contact dimple contact via and the flange via, etch back layer depositing an etch back layer over the conducting layer and over the contact via and over the flange via, a top surface of the etch back layer over the contact via and flange via is higher than a top surface of the conducting layer, back etching the etch back layer for exposing an exposed portion of the conducting layer for providing a surviving etch back dimple portion of the etch back layer over the contact via and the flange via, the etch back dimple portion of the etch back layer covering a conducting dimple portion of the conduction layer, and exposed portion removing the exposed portion of the conducting layer, the conducting dimple portion becoming the contact.