Patent ID: 11915925
Assignee: DAICEL CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC H

Claim 4:
5. A method of manufacturing a semiconductor device comprising:
forming a reinforced wafer having a laminated structure, the laminated structure comprising a second wafer including a main surface and a back surface opposite from the main surface, a supporting substrate, and a temporary adhesive layer located between the main surface side of the second wafer and the supporting substrate;
thinning the second wafer by grinding the second wafer in the reinforced wafer from the back surface of the second wafer, so that the second wafer has a thickness from 1 to 20 μm;
bonding, via an adhesive, an element forming surface having a wiring pattern of a first wafer to the back surface side of the second wafer in the reinforced wafer that has undergone the thinning step, so that the adhesive forms an adhesive layer between the first wafer and the second wafer; and
removing the supporting substrate, which is temporally attached to the second wafer via the temporary adhesive layer, from the second wafer in the reinforced wafer that has undergone the bonding step, so as to obtain a wafer laminate having a laminated structure comprising the first wafer including the element forming surface having the wiring pattern, the second wafer with the thickness from 1 to 20 μm, and the adhesive layer with a thickness from 0.5 to 4.5 μm interposed between the element forming surface of the first wafer and the back surface of the second wafer;
hole forming to form a hole extending inside the wafer laminate and reaching the wiring pattern of the first wafer by an etching treatment from the second wafer side via a mask pattern masking a portion of the main surface side of the second wafer in the wafer laminate; and
electrode forming to form a through electrode by filling the hole with a conductive material;
wherein the adhesive layer has an etching rate of 1 to 2 μm/min in dry etching performed using an etching gas comprising CF4, O2, and Ar at a volume ratio of 100:400:200 under conditions of an atmospheric pressure of 100 mTorr and a high frequency power supply power of 2000 W; and
a temporary adhesive for forming the temporary adhesive layer contains a polyvalent vinyl ether compound, a compound comprising two or more hydroxy groups or carboxy groups capable of forming an acetal bond by reacting with a vinyl ether group of the polyvalent vinyl ether compound and thus capable of forming a polymer with the polyvalent vinyl ether compound, and a thermoplastic resin.