Patent ID: 6236078
Filing Date: 2001-05-22
Classification: H01L

Abstract:
A semiconductor memory device comprising:a transistor having a first conductive layer, a second conductive layer and a gate electrode;a first insulating film formed on said transistor;a first opening defined in said first insulating film on said first conductive layer;a capacitor comprising,a first electrode having an on-film extending electrode portion connected to the first conductive layer through said first opening and extending over the first insulating film, and an electrode portion extending in a hood shape which projects in a first direction corresponding to the direction of the normal to a main surface of the first insulating film from said on-film extending electrode portion and extends in a second direction normal to the first direction,a second insulating film formed on an exposed surface of the first electrode, anda second electrode formed on an exposed surface of the second insulating film;a second opening defined in said first insulating film on said second conductive layer; anda bit line connected to said second conductive layer through said second opening, wherein said hood-shaped extending electrode portion has a structure having a distance of a projected drawing as viewed from above, which extends in the second direction, which is shorter than a distance of a projected drawing as viewed from above said capacitor, which extends in the second direction, and which protrudes only from said on-film extending electrode portion placed on the side opposite to said on-film extending electrode portion on the provision side of said second opening with respect to the first opening, a thickness from the second conductive layer to a top of the bit line is at least a thickness of the hood-shaped extending electrode portion lower than a thickness of the capacitor from the first conductive layer to a top of the capacitor.