Patent ID: 8169082

Claim:
A semiconductor device comprising: a first chip having a plate shape with a first side and including a first IC circuit, which is disposed on the first side of the first chip; and a second chip having a plate shape with a second side and including a second IC circuit, which is disposed on the second side of the second chip, wherein the first chip further includes: a first insulation film disposed on the first IC circuit; a first wiring layer disposed on the first insulation film and coupled with the first IC circuit; a second insulation film disposed on the first wiring layer and having a first opening for exposing the first wiring layer from the second insulation film; and a second wiring layer disposed on the first wiring layer exposed from the second insulation film via the first opening, wherein the second wiring layer includes a first concavity, which is disposed over the first opening and is concaved toward the first opening, wherein the second chip further includes: a third insulation film disposed on the second IC circuit; a third wiring layer disposed on the third insulation film and coupled with the second IC circuit; a fourth insulation film disposed on the third wiring layer and having a second opening for exposing the third wiring layer from the fourth insulation film; and a fourth wiring layer disposed on the third wiring layer exposed from the fourth insulation film via the second opening, wherein the fourth wiring layer includes a second concavity, which is disposed over the second opening and is concaved toward the second opening, wherein the first concavity of the second wiring layer faces the second concavity of the fourth wiring layer, and wherein the second wiring layer of the first chip is bonded to the fourth wiring layer of the second chip so that the first side of the first chip is coupled with the second side of the second chip.