Patent ID: 8225472

Claim:
A method of forming a thin film acoustic device having a piezoelectric film between a first electrode and a second electrode that enable application of an electric field to the piezoelectric film, the method comprising: (a) providing a substrate; (b) depositing a layer of non-conducting material on a first side of the substrate; (c) patterning the layer of non-conducting material to expose a portion of the first side of the substrate; (d) depositing one or more layers of conducting material on the layer of non-conducting material and the exposed portion of the first side of the substrate; (e) depositing a layer of piezoelectric material on the one or more layers of conducting material; (f) depositing one or more additional layers of material on the layer of piezoelectric material; (g) patterning the one or more additional layers to form the first electrode; (h) depositing a masking layer on a second side of the substrate; (i) patterning the masking layer to expose a portion of the second side of the substrate; (j) etching away the exposed portion of the second side of the substrate to expose the patterned layer of non-conducting material and a portion of the one or more layers of conducting material; and (k) etching away the exposed portion of the one or more layers of conducting material to form the second electrode.