Patent ID: 6613676
Filing Date: 2003-09-02
Classification: H01L

Abstract:
A process for reclaiming an SOI substrate, comprising:a step of providing an SOI substrate having a semiconductor base plate, and a single crystal semiconductor layer formed thereon with interposition of an insulation layer; a first removal step for removing the single crystal semiconductor layer; a second removal step for removing the insulation layer which has been exposed in the first removal step to bare a surface of the semiconductor base plate; and a step of flattening the bared surface of the semiconductor base plate by heat-treating in a reductive atmosphere containing hydrogen the semiconductor base plate, or alternatively, by subjecting the surface to chemical mechanical polishing to flatten the bared surface of the semiconductor base plate, wherein the SOI substrate has been fabricated by a bonding method, and the bared surface of the semiconductor base plate has roughness of several nanometers in cycle, the roughness having been generated by the bonding method.