Patent ID: 7662710
Filing Date: 2010-02-16
Classification: H01L

Abstract:
1. A method of providing through-wafer interconnections in a semiconductor wafer having first and second sides, the method comprising: etching the first side of the wafer to form a cavity; providing an etch stop layer over the first side of the wafer, wherein the etch stop layer covers surfaces in the cavity; etching the second side of the wafer to form one or more micro-vias such that the one or more micro-vias reach the etch stop layer; depositing metallization over one of the first and second sides of the wafer; subsequently removing regions of the etch stop layer from areas corresponding to where the one or more micro-vias were formed; and depositing metallization over the other one of the first and second sides of the wafer so that the metallization deposited over the first side is in contact with the metallization deposited over the second side to form the through-wafer interconnections in areas corresponding to where the one or more micro-vias were formed.