Patent ID: 8671531

Claim:
A manufacturing method for a Zinc Oxide piezoelectric thin-film with high C-axis orientation comprises the steps of: providing a substrate having a base, a SiO 2 layer and a Si 3 N 4 layer; forming a bottom electrode layer on the Si 3 N 4 layer; patterning the bottom electrode layer; sputtering a Zinc Oxide layer on the Si 3 N 4 layer and the bottom electrode layer, parameters for sputtering the Zinc Oxide layer include substrate temperature, oxygen/argon ratio, sputtering power and base pressure, wherein the substrate temperature is within the range of 250 to 350 degrees C., the oxygen/argon ratio is within the range of 20% to 25%, the sputtering power is within the range of 150 to 250 watts and the base pressure is within the range of 5×10-6 to 7×10-6 Torr; patterning the Zinc Oxide layer; forming a photoresist layer on the Zinc Oxide layer and the Si 3 N 4 layer; patterning the photoresist layer to reveal the Zinc Oxide layer; forming a top electrode layer on the Zinc Oxide layer and the photoresist layer; removing a portion of the photoresist layer and a portion of the top electrode layer formed on the photoresist layer, and another portion of the top electrode layer formed on the Zinc Oxide layer can be remained; and patterning the Si 3 N 4 layer to form a recess that reveals the base of the substrate.