Patent ID: 8237242
Filing Date: 2012-08-07
Classification: G02F,H01G,H01L

Abstract:
1. A capacitor comprising: a first electrode; a dielectric; and a second electrode that are sequentially stacked, wherein the dielectric has a stacked layer structure including a predetermined number of hafnium oxide layers and at least one tantalum oxide layer, and wherein a layer that is in contact with the first electrode and a layer that is in contact with the second electrode are each comprised of hafnium oxide; and wherein a ratio of the combined total thickness of all tantalum oxide layers included in the dielectric to the total thickness of the dielectric is in the range of 0.2 to 0.45 and further wherein each of the hafnium oxide layers has a thickness of at least 1.6 nm equivalent oxide thickness and thicknesses of the hafnium oxide layers are not equal.