Patent ID: 8383436
Filing Date: 2013-02-26
Classification: H01J,H01L

Abstract:
1. A manufacturing method for semiconductor chips, the manufacturing method comprising: performing plasma etching on a second surface of a semiconductor wafer also having a first surface located opposite to the second surface, the first surface having formed thereon (i) semiconductor devices located in a plurality of device-formation-regions defined by dividing regions and (ii) an insulating film located in the dividing regions, and the second surface having formed thereon a mask defining the dividing regions, whereby portions of the semiconductor wafer that correspond to the dividing regions are removed and portions of the insulating film facing the semiconductor wafer and corresponding to the dividing regions are exposed; removing corner portions of the semiconductor wafer in contact with the insulating film in the device-formation-regions by continuously performing the plasma etching in a state in which the exposed portions of the insulating film are charged with electric charge due to ions in plasma; and subsequently, removing the exposed portions of the insulating film so that the device-formation-regions are individually divided, whereby semiconductor chips each of which has one of the semiconductor devices are manufactured.