Patent ID: 6717271
Filing Date: 2004-04-06
Classification: H01L,Y10S

Abstract:
A semiconductor device comprising:a semiconductor substrate having current input/output regions via which current flows; a first insulating film formed on said semiconductor substrate and having an upper surface and a gate electrode opening; and a mushroom gate electrode structure formed on said semiconductor substrate via the gate electrode opening, said mushroom gate electrode structure having a stem and a head formed on the stem, the stem having a limited size on said semiconductor substrate along a current direction and having a forward taper shape upwardly and monotonically increasing the size along the current direction, the head having a size expanded stepwise along the current direction at a level above and separated from said upper surface of said first insulating film, and the stem contacting said semiconductor substrate in the gate electrode opening and riding on said upper surface of said first insulating film at least one of opposite ends of the stem along the current direction.