Patent ID: 8278186

Claim:
A wafer bonding method, which comprising: (a′) providing a first process chamber with a first wafer whose bonding surface faces upward; (b′) cleaning and surface-treating the bonding surface of the first wafer by supplying atmospheric pressure plasma and a cleaning solution to the bonding surface of the first wafer; (c′) withdrawing out the first wafer from the first process chamber and providing a second process chamber with the first wafer; (d′) providing a third process chamber with a second wafer whose bonding surface faces upward; (e′) cleaning and surface-treating the bonding surface of the second wafer by supplying atmospheric pressure plasma and a cleaning solution to the bonding surface of the second wafer; (f′) withdrawing out the second wafer from the third process chamber and providing the second process chamber with the second wafer whose bonding surface faces to the bonding surface of the first wafer; and (g′) bonding the bonding surfaces of the first and second wafers to each other.