Patent ID: 9627250
Date: 2017-04-18
CPC Classifications: H01L

Claim:
1. A device comprising: a first metal feature having a first part within a dielectric layer and having a top surface of the first metal feature; an etching stop layer (ESL) with a bottom surface of the ESL above and in contact with the dielectric layer, and a top surface of the ESL above the bottom surface of the ESL; an opening at the ESL exposing the top surface of the first metal feature, wherein the opening at the ESL has a bottom edge of the opening above the bottom surface of the ESL, a first sidewall of the opening proximate a first side of the first metal feature, and a second sidewall of the opening proximate a second side of the first metal feature; a second metal feature having a bottommost surface below the top surface of the first metal feature and above a topmost surface of the dielectric layer, the ESL separating the dielectric layer from the second metal feature, the second metal feature being interjacent the first metal feature and the ESL layer, and the second metal feature being interjacent the first metal feature and an overlying conductive feature, wherein the overlying conductive feature physically contacts the topmost surface of the second metal feature, wherein the overlying conductive feature does not extend above a second dielectric layer, wherein the second dielectric layer is disposed above and contacting the ESL; and a separate metal feature within the dielectric layer extending into the ESL, wherein the ESL extends over a top surface of the separate metal feature.