Patent ID: 7494845
Filing Date: 2009-02-24
Classification: H01L

Abstract:
1. A method of forming a stack of wafers, comprising: providing a first wafer to produce a first bump that extends at least partway through the first wafer and protrudes from a front surface thereof; affixing a support member to the front surface of the first wafer after providing the first wafer; reducing a thickness of the first wafer to form a first thinned wafer, wherein a lower end of the first bump protrudes from a rear surface of the first thinned wafer; providing a second wafer to produce a second bump that protrudes from a front surface thereof; joining the first thinned wafer and the second wafer so that the protruded lower end of the first bump is electrically connected to the protruding second bump; and completely removing the support member from the first thinned wafer.