Patent ID: 7871901
Filing Date: 2011-01-18
Classification: H01L

Abstract:
1. A manufacturing method for semiconductor chips, the method comprising: providing a semiconductor wafer having a first side, a second side, a plurality of semiconductor devices placed in device-formation-regions of the first side, and an insulating film provided on the first side, wherein the first side of the semiconductor wafer is opposite relative to the second side of the semiconductor wafer; forming dividing-groove portions in the second side of the semiconductor wafer, the dividing-groove portions being located in dividing regions of the second side of the semiconductor wafer; performing plasma etching on the semiconductor wafer from the second side to etch an entire surface of the second side including all surfaces of the dividing-groove portions, whereby corner portions formed on the second side at the dividing-groove portions are rounded, and portions of the insulating film are exposed by removing remaining portions of the wafer at the dividing-groove portions; rounding corner portions formed on the first side at the dividing-groove portions and being in contact with the insulating film, the corner portions being removed by continuously performing the plasma etching in a state in which exposed surfaces of the insulating film are charged with electric charge due to ions in plasma; and subsequently, removing exposed insulating film from the first side so that the device-formation-regions are individually separated, and thereby semiconductor chips each of which includes one of the semiconductor devices are manufactured.