Patent ID: 9666566
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A method for bonding wafers, the method comprising: providing a first wafer having a first dummy metal pattern disposed within and on a first surface of the first wafer, the first wafer having a second surface opposing the first surface, a percentage of metal surface area of the first dummy metal pattern relative to a total surface area of the first dummy metal pattern in a first range from about 40% to about 90%; providing a second wafer having a second dummy metal pattern disposed within and on a third surface of the second wafer, the second wafer having a fourth surface opposing the third surface, a percentage of metal surface area of the second dummy metal pattern relative to a total surface area of the second dummy metal pattern in a second range from about 40% to about 90%; planarizing the second surface of the first wafer; planarizing the fourth surface of the second wafer; and hybrid bonding the fourth surface to the second surface.