Patent ID: 7790476
Filing Date: 2010-09-07
Classification: H01L

Abstract:
1. A method for fabricating a ferroelectric memory device, comprising: forming an interlayer insulation film over a semiconductor substrate in which a transistor is formed such that said interlayer insulation film covers said transistor; forming a conductive contact plug in said interlayer insulation film so as to make a contact with a diffusion region of said transistor; and forming a ferroelectric capacitor by depositing a lower electrode, a ferroelectric film and an upper electrode consecutively on said contact plug, wherein said method further comprises, after forming said contact plug but before forming said lower electrode: terminating a surface of said interlayer insulation film and a surface of said contact plug with an OH group; forming a layer containing Si, oxygen and a CH group on said surface of said interlayer insulation film and said contact hole terminated with said OH group by coating a Si compound containing a Si atom and a CH group in a molecule thereof; converting said layer containing Si, oxygen and said CH group to a layer containing nitrogen at a surface thereof, by substituting said CH group in said layer containing Si, oxygen and said CH group at least at a surface part thereof with nitrogen atoms; and forming a layer showing self-orientation on said surface containing nitrogen.