Patent ID: 7632357

Claim:
A silicon wafer cleaning method, performed after mirror-polishing of the surface of the silicon wafer, comprising: a first cleaning process, in which, after completion of said mirror polishing, the silicon wafer is immersed in a non-ionic surfactant aqueous solution; a second cleaning process, in which the silicon wafer, after completion of said first cleaning process, is immersed in a dissolved-ozone aqueous solution; and, a third cleaning process, in which the silicon wafer, after completion of said second cleaning process, is immersed in an aqueous solution containing ammonia and hydrogen peroxide; wherein said first cleaning process through third cleaning process are performed in succession; the aqueous solution containing ammonia and hydrogen peroxide used in the third cleaning process is heated to a temperature of 75 to 80° C. and used; and the time of immersion of the silicon wafer in the aqueous solution containing ammonia and hydrogen peroxide is from 2 to 5 minutes.