Patent ID: 7221013
Filing Date: 2007-05-22
Classification: H01L

Abstract:
1. A semiconductor device, comprising: an underlying layer, which is a deposited film, having an insulating property and having a concave portion in a surface portion; a lower electrode formed on said underlying layer along an inner face of said concave portion; a capacitor insulating film formed on said lower electrode and made of a high-dielectric or a ferroelectric; and an upper electrode formed on said capacitor insulating film, wherein an upper end pan of a side face and a corner part at a bottom face of said concave portion of said underlying layer are rounded, said side face of said concave portion forms an angle with said bottom face of said concave portion and an angle with a surface of said underlying layer respectively at 93 degrees to 130 degrees, in each of said lower electrode and said upper electrode, a thickness ratio of a thinnest part in a part located on said inner face of said concave portion to a part located on said underlying layer is 0.6 or more, and in each of said upper electrode and said lower electrode, a thickness of a thinnest part is 10 nm or more.