Patent ID: 8652927

Claim:
A semiconductor layer stack comprising: a first material formed over a substrate, wherein the first material is a conductive material; a second material formed over the etched first material, after a portion of the first material has been etched, wherein the second material is a conductive material; a third material formed over the etched second material, after a portion of the second material has been etched, wherein the third material is a dielectric material; and a fourth material formed over the third material, wherein the fourth material is a conductive material, wherein the third material comprises one of aluminum oxide, barium-strontium-titanate (BST), erbium oxide, hafnium oxide, hafnium silicate, lanthanum oxide, niobium oxide, lead-zirconium-titanate (PZT), a bilayer of silicon oxide and silicon nitride, silicon oxy-nitride, strontium titanate (STO), tantalum oxide, titanium oxide, zirconium oxide, or combinations thereof, and wherein the third material further comprises a dopant.