Patent ID: 7884404
Filing Date: 2011-02-08
Classification: G11C,H01L

Abstract:
1. A ferroelectric memory device, comprising: a semiconductor substrate; a field effect transistor formed over said semiconductor substrate, said field effect transistor including first and second diffusion regions; an interlayer insulation film formed over said semiconductor substrate so as to cover said field effect transistor; a conductive plug formed in said interlayer insulation film in contact with said first diffusion region; and a ferroelectric capacitor formed over said interlayer insulation in contact with said conductive plug, said ferroelectric capacitor comprising a ferroelectric film and upper and lower electrodes sandwiching said ferroelectric film respectively from above and below, said lower electrode being connected electrically to said conductive plug, a layer containing aluminum and oxygen being interposed between said the conductive plug and said lower electrode, a layer containing nitrogen being interposed between said layer containing aluminum and oxygen and said lower electrode, a self-aligned layer of a substance having a self-orientation being interposed between said layer containing nitrogen and said lower electrode.