Patent ID: 7432204

Claim:
A method of manufacturing a non-productive wafer, comprising: providing a semiconductor substrate; simultaneously forming a first protective layer on a first surface of said semiconductor substrate, and a second protective layer on a second surface of said semiconductor substrate; forming a polysilicon layer on said semiconductor substrate; oxidizing said polysilicon layer so as to form an oxide layer; and removing said oxide layer; wherein said non-productive wafer is used to improve the quality of a deposition process of polysilicon on one or more productive wafers by subjecting the non-productive wafer to the polysilicon deposition process performed on the productive wafers, wherein the protective layer protects the semiconductor substrate from damage during removal of said oxide layer from the non-productive substrate to reclaim the non-productive wafer, and wherein said protective layer is a silicon nitride layer formed by a chemical vapor deposition process, said chemical vapor deposition process employing SiH 2 Cl 2 gas or NH 3 gas.