Patent ID: 9576827
Date: 2017-02-21
CPC Classifications: B23B,H01L,Y10T

Claim:
1. A wafer bonding system comprising: a first wafer chuck having a first surface; and a second wafer chuck having a second surface, the second wafer chuck comprising: a profile control layer, the profile control layer having a first control zone with a first adjustable volume and a second control zone with a second adjustable volume, wherein a profile of the second surface is adjustable by the profile control layer, wherein the first adjustable volume and the second adjustable volume are isolated by a flexible sidewall, wherein the second adjustable volume encircles the first adjustable volume, and wherein the first adjustable volume is adjustable independently from the second adjustable volume; and a first holding mechanism over the profile control layer, the first holding mechanism being configured to hold a first wafer against the second surface of the second wafer chuck, wherein the first holding mechanism comprises first vacuum openings in the second surface.