Patent ID: 7547558
Filing Date: 2009-06-16
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a lower electrode film, a ferroelectric film and an upper electrode film; patterning the upper electrode film, the ferroelectric film and the lower electrode film respectively; forming a first protective film covering the upper electrode film, the ferroelectric film and the lower electrode film by an atomic layer deposition method which uses tetra-methyl-aluminum as a deposition gas and uses an oxidant not including hydrogen under a condition in which the ferroelectric film is not deteriorated; supplying oxygen to the ferroelectric film via the first protective film by annealing in an atmosphere containing oxygen; forming a second protective film covering the first protective film by an atomic layer deposition method which uses tetra-methyl-aluminum as a deposition gas and uses an oxidant not including hydrogen under a condition in which the ferroelectric film is not deteriorated; forming a first interlayer insulating film above the second protective film; after forming the first interlayer insulating film, supplying oxygen to the ferroelectric film via the first and second protective films by annealing in an atmosphere containing oxygen; after supplying oxygen to the ferroelectric film via the first and second protective films, forming a second interlayer insulating film above the first interlayer insulating film; and forming a wiring connected to the upper electrode film, on the second interlayer insulating film; wherein the first protective film has a thickness which is set to such a degree that configuration elements of the ferroelectric film do not substantially penetrate through the first protective film, and that oxygen penetrates through the first protective film; wherein the second protective film has a thickness which is set to such a degree that hydrogen and moisture do not substantially penetrate through the second protective film; and wherein the first and second protective films are alumina films.