Patent ID: 8318588

Claim:
A method for reprocessing a semiconductor substrate comprising the steps of: performing a first etching treatment on a semiconductor substrate comprising a first damaged semiconductor region and a projecting portion, the projection portion including a second damaged semiconductor region and an insulating layer over the second damaged semiconductor region, whereby the insulating layer is removed; performing a second etching treatment on the semiconductor substrate, after performing the first etching treatment, by using a solution containing a first substance capable of oxidizing a semiconductor material included in the semiconductor substrate, a second substance capable of dissolving an oxidized semiconductor material, and a third substance capable of controlling a speed of oxidation of the semiconductor material and a speed of dissolution of the oxidized semiconductor material, whereby the first and the second damaged semiconductor regions are removed selectively with respect to a non-damaged semiconductor region; performing a third etching treatment after the second etching treatment, whereby oxidized portions of the semiconductor material at the surface of the semiconductor substrate are removed; forming an oxide film on a surface of the semiconductor substrate after performing the third etching treatment; and performing a polishing treatment on a surface of the oxide film, whereby the surface of the semiconductor substrate is exposed and planarized.