Patent ID: 6436844
Filing Date: 2002-08-20
Classification: H01L

Abstract:
A method for producing a contact between a conductive material and a substrate in a semiconductor device wherein the contact is adjacent to but insulated from a conductive structure, comprising:forming at least one conductive structure on a substrate, wherein the conductive structure contains a vertical surface and a top surface, and wherein the substrate contains a top surface; forming a nonconformal first dielectric over the structure, the first dielectric being thicker at the vertical surface of the conductive structure that is distant from the top surface of the substrate; forming a second dielectric over the first dielectric; anisotropically etching the device to expose the substrate, wherein the anisotropic etch removes the second dielectric faster than the first dielectric, and wherein the thicker portion of the first dielectric layer prevents a breach to the conductive structure; and forming a conductive material in contact with the exposed portion of the substrate, wherein the conductive material is insulated from the conductive structure.