Patent ID: 8728870

Claim:
A manufacturing method for a thin film silicon wafer which has gettering capability even after having been reduced in thickness to be in a thin film form and includes a device layer having a front device layer surface and a rear device layer surface disposed opposite the front device layer surface, the manufacturing method comprising the steps of: forming a first gettering layer on the rear device layer surface, the first gettering layer being fabricated from a first gettering material; forming a second gettering layer on the first gettering layer, the second gettering layer being fabricated from a second gettering material being different from the first gettering material thereby forming a unitary structure having the first gettering layer sandwiched between and in facial contact with the rear device layer surface and the second gettering layer; fabricating a device on the front device layer surface of the device layer; and after the device has been fabricated, removing the second gettering layer so as to leave the first gettering layer in place and in facial contact with the rear device layer surface of the device layer.