Patent ID: 8524576
Filing Date: 2013-09-03
Classification: C23C,H01L

Abstract:
1. A wafer processing method for processing a back side of a wafer composed of a silicon substrate and a plurality of devices formed on a front side of said silicon substrate so as to be partitioned by a plurality of division lines, said wafer processing method comprising: a back grinding step of grinding the back side of said wafer having said devices on the front side thereof, thereby reducing the thickness of said wafer to a predetermined thickness; a back polishing step of polishing the back side of said wafer after performing said back grinding step, thereby removing a grinding strain; and a silicon nitride film forming step of forming a silicon nitride film on the back side of said wafer after performing said back polishing step, but prior to a step of partitioning along the division lines, wherein the thickness of said silicon nitride film to be formed in said silicon nitride film forming step is set to 6 to 100 nm.