Patent ID: 8048768

Claim:
A method of fabricating a joined wafer, which comprises at least: a wafer preparing step of preparing a transparent wafer and a device formed wafer having device formed areas in its surface; an adhesive layer forming step of forming a negative-type photosensitive adhesive layer over a surface of said transparent wafer or said device formed wafer; an adhesive layer exposure step of exposing at least a portion of the photosensitive adhesive layer formed over said transparent wafer or said device formed wafer; an adhesive layer developing step of developing the photosensitive adhesive layer formed over said transparent wafer or said device formed wafer to remove part thereof; and a wafer sticking step of sticking said transparent wafer and said device formed wafer together with the photosensitive adhesive layer left on said transparent wafer or said device formed wafer so as to be a joined wafer, wherein said adhesive layer exposure step comprises: a device formed-area exposure step of exposing by a stepper such that parts of the photosensitive adhesive layer formed over said transparent wafer or said device formed wafer are removed, said parts corresponding to said device formed areas when said transparent wafer and said device formed wafer are stuck together; and a wafer periphery exposure step of exposing such that a portion of the photosensitive adhesive layer over the periphery of said transparent wafer or said device formed wafer is left.