Patent ID: 8722504

Claim:
A method for forming a capacitor stack, the method comprising: forming a first electrode layer on a substrate; forming a first interface dielectric layer on the first electrode layer, wherein the k value of the first interface dielectric layer is between about 10 and about 30, wherein the first interface dielectric layer comprises one of La 2 O 3 , Lu 2 O 3 , Er 2 O 3 , MgO, Ga 2 O 3 , or combinations thereof; forming a bulk dielectric layer on the first interface dielectric layer, wherein the k value of the bulk dielectric layer is at least about 40; forming a second interface dielectric layer on the bulk dielectric layer wherein the k value of the second interface dielectric layer is between about 10 and about 30, wherein the first interface dielectric layer and the second interface dielectric layer directly interface the bulk dielectric layer and increase a barrier height between the first electrode layer and the bulk dielectric layer and a barrier height between the second electrode layer and the bulk dielectric layer; and forming a second electrode on the second interface dielectric layer.