Patent ID: 9608034
Date: 2017-03-28
CPC Classifications: H01L

Claim:
1. A manufacturing method of a semiconductor device comprising the steps of: (a1) providing a first semiconductor substrate and a second semiconductor substrate; (b1) cleaning a first surface on a main surface side of the first semiconductor substrate and a second surface on a main surface side of the second semiconductor substrate, wherein the cleaning comprises ultrasonic cleaning or cleaning with pure water; (c1) after the step (b1), desorbing adsorbed substances over the first surface of the first semiconductor substrate and over the second surface of the second semiconductor substrate; (d1) activating the first surface of the first semiconductor substrate and the second surface of the second semiconductor substrate; (e1) after the steps (c1) and (d1), attaching and temporarily bonding together the first surface of the first semiconductor substrate and the second surface of the second semiconductor substrate at a temperature of approximately 25° C.; and (f1) after the step (e1), enhancing a bonding strength between the first semiconductor substrate and the second semiconductor substrate by subjecting both the semiconductor substrates to a heat treatment in a temperature range of 200 to 300° C.; and (g1) after the step (f1), making a thickness of the first semiconductor substrate to be small by polishing a back surface of the first semiconductor substrate, wherein, in the step (c1), moisture is removed from the first surface of the first semiconductor substrate and the second surface of the second semiconductor substrate by performing a heat treatment at a temperature of 100° C. or higher, wherein, in the step (d1), the first surface of the first semiconductor substrate and the second surface of the second semiconductor substrate are activated by performing a plasma treatment, and wherein the semiconductor device is an image sensor.