Patent ID: 6645846
Filing Date: 2003-11-11
Classification: H01L,Y10T

Abstract:
A method of forming a conductive contact to a conductive structure, comprising:forming a conductive structure received within and projecting outwardly from a first insulative material, conductive material of the conductive structure being received within and projecting outwardly from the first insulative material; depositing a second insulative material over the conductive structure, the second insulative material being different in composition from the first insulative material; anisotropically etching the second insulative material effective to form a sidewall etch stop over a sidewall of the conductive material of the conductive structure; depositing a third insulative material over the conductive structure and the sidewall etch stop, the third insulative material being different in composition from the second insulative material; and etching a contact opening through the third insulative material to the conductive material of the conductive structure using an etch chemistry which is substantially selective to the second insulative material of the sidewall etch stop.