Patent ID: 8613863

Claim:
A method for patterning a metal oxide stack comprising: etching a first layer using a physical sputter etch process, wherein the first layer is operable as a capping layer for the metal oxide stack, and wherein the first layer comprises platinum; etching a second layer using a first wet etch process, wherein the second layer is disposed under the first layer, wherein the second layer is operable as an electrode layer for the metal oxide stack, wherein the second layer comprises TiN, and wherein the first wet etch process comprises a first solution comprising NH 4 OH and H 2 O 2 ; etching a third layer using a second wet etch process, wherein the third layer is disposed under the second layer, wherein the third layer is operable as a metal oxide layer for the metal oxide stack, wherein the third layer comprises HfO 2 or ZrO 2 , and wherein the second wet etch process comprises a second solution comprising HF and HCl.