Patent ID: 6756621
Filing Date: 2004-06-29
Classification: H01L

Abstract:
A ferroelectric capacitor device comprising a bottom electrode, a capacitor insulating film formed of a ferroelectric film, and a top electrode,wherein the ferroelectric film has a bismuth layer structure including a plurality of bismuth oxide layers and a plurality of perovskite-like layers alternately put on top of each other, the plurality of bismuth oxide layers are formed of Bi2O2, and the plurality of perovskite-like layers includes two or more kinds of layers represented by general formula (1): Amâˆ’1BmO3m+&agr; (where A is a univalent, divalent or trivalent metal, B is a tetravalent, pentavalent or hexavalent metal, m is an integer equal to or more than 1, at least one of A being Bi if m is an integer equal to or more than 2, and 0&lE;&agr;&lE;1) and different in the value of m from each other.