Patent ID: 7829418
Filing Date: 2010-11-09
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor apparatus, which is a method for fabricating a semiconductor apparatus having a trench gate transistor, the method comprising at least: a step of providing a device isolation insulating film and an active region in a semiconductor substrate; a step of forming a trench in the active region; a step of removing or reducing a burr generated inside the trench; and a step of forming a gate insulating film inside the trench as well as forming a gate electrode in the trench, wherein the trench is provided so that both ends thereof are brought into contact with the device isolation insulating film, and the semiconductor apparatus is configured from an opening portion positioned on one surface of the semiconductor substrate, a pair of first inner walls positioned in a side of the device isolation insulating film and connected with the opening portion, a pair of second inner walls positioned in a side of the active region and connected with the opening portion, and a bottom portion is positioned opposite to the opening portion and connected with the first inner walls and the second inner walls, wherein a step of removing or reducing the burr further comprises: