Patent ID: 8575722
Filing Date: 2013-11-05
Classification: H01L

Abstract:
1. A method for producing a semiconductor wafer having a multilayer film, in production of a semiconductor device by the steps of forming a porous layer on a surface of a semiconductor wafer by changing a surface portion of the semiconductor wafer into the porous layer, forming a semiconductor film on a surface of the porous layer to produce the semiconductor wafer having a multilayer film, fabricating a device on the semiconductor film, and producing the semiconductor device by delaminating the semiconductor film along the porous layer, the semiconductor film having the device formed thereon; comprising at least: flattening a surface of a porous layer side of the semiconductor wafer after delaminating the semiconductor film having the device formed thereon, the porous layer being used for the delamination, and reusing the flattened semiconductor wafer as the semiconductor wafer for forming the porous layer to perform the steps of forming the porous layer and of forming the semiconductor film; the method further comprising a thickness adjusting step of adjusting a whole thickness of the semiconductor wafer having a multilayer film to be produced by reusing the semiconductor wafer so as to satisfy a predetermined standard, wherein a number of reuse for the flattened semiconductor wafer is set to at least 3 times or more, and the thickness adjusting is performed by adjusting a thickness of the semiconductor film to be formed on the surface of the porous layer only after forming the porous layer on the surface of the reused semiconductor wafer.