Patent ID: 7378307
Filing Date: 2008-05-27
Classification: H01L

Abstract:
1. A method for forming a gate structure in a semiconductor device, comprising the steps of: forming a SiGe film on a predetermined region of a silicon substrate corresponding to a bit-line node portion where a bit-line junction is formed; growing a silicon film on the entirety of the silicon substrate having the SiGe film formed thereon; forming trenches by selectively etching the silicon film and the silicon substrate to define an active region where the gate structure will be formed; embedding a dielectric material into the trenches; forming a stepped profile comprising an upper surface, slant surfaces and a lower surface on the silicon film by etching a predetermined portion of the silicon film such that the bit-line node portion is included in the stepped profile; and forming a gate on the silicon film having the stepped profile formed therein such that the gate overlaps the stepped profile.