Patent ID: 7700987
Filing Date: 2010-04-20
Classification: H01L

Abstract:
1. A ferroelectric memory device comprising: a top electrode of a ferroelectric capacitor; a bottom electrode of the ferroelectric capacitor; a ferroelectric film which is sandwiched between the top electrode and the bottom electrode, said ferroelectric film including a first portion having a side surface flushed with a side surface of the top electrode and a second portion having a side surface flushed with a side surface of the bottom electrode, the first and second portions forming a step by making the side surface of the second portion project outward from the side surface of the first portion; a top mask which is provided on the top electrode; and a side mask which is provided on part of a side surface of the top mask, the side surface of the top electrode, and the side surface of the first portion of the ferroelectric film, the side mask including a top at a lower level than a top of the top mask and at a higher level than a top of the top electrode, the side mask including a plurality of mask layers.