Patent ID: 7863104

Claim:
A method of fabricating a semiconductor chip, the method comprising: providing an adhesive layer on the outer area of an active surface of a device wafer; bonding a rigid body to the active surface of the device wafer by the adhesive layer; thinning the device wafer by treating a passive surface of the device wafer that is opposite to the active surface; bonding a second backing tape below a first backing tape; bonding the first backing tape to the passive surface of the device wafer after bonding the second backing tape below the first backing tape; sawing sufficiently deeply to separate an outer portion of the rigid body from a central portion of the rigid body and to separate an outer portion of the device wafer from a central portion of the device wafer; removing the central portion of the rigid body from over the central portion of the device wafer; cutting a first trench in the first backing tape, the first trench encircling the device wafer; cutting a second trench in the first backing tape, the first trench encircling the second trench; removing the strip of the first backing tape that is disposed between the first and second trenches, the outer portion of the device wafer, and the outer portion of the rigid body from the second backing tape after cutting the first and second trenches; and dicing the device wafer into semiconductor chips.