Patent ID: 7365012
Filing Date: 2008-04-29
Classification: H01L

Abstract:
1. A method of forming a trench isolation structure on the surface of a semiconductor substrate, the semiconductor substrate being constituted from Si as a main material, the method comprising the steps of: a first step at which trenches are formed on the surface of the semiconductor substrate; a second step at which an insulating material is supplied onto the surface of the semiconductor substrate to fill in the trenches with the insulating material, the insulating material being constituted from SiO a third step at which the surface side of the insulating material is flattened by eliminating a part of the insulating material; a fourth step at which the surface of the semiconductor substrate is exposed while maintaining a state that the insulating material is filled in the trenches by eliminating the insulating material by a substantially constant thickness; and a fifth step at which an etching agent is supplied onto the surfaces of the semiconductor substrate and the insulating material filled in the trenches to form a step between the semiconductor substrate and the insulating material, an etching rate of Si by the etching agent is higher than an etching rate of SiO