Patent ID: 9246080
Filing Date: 2016-01-26
CPC Classification: C23C,C30B,H01L,Y10T

Claim Text:
1. A piezoelectric device, comprising: a silicon substrate; and a Pt film and a film of a dielectric material having a perovskite structure, which are arranged from the silicon substrate side in this order; wherein the film of the dielectric material comprises layers different in Zr/Ti ratio, which are a first layer in which a compounding percentage of Zr is greater than zero but not more than 53% in Zr/Ti ratio and a second layer in which a compound percentage of Zr in Zr/Ti ratio is not less than that of the first layer, and the first layer is arranged between the Pt film and the second layer, and wherein each of the first layer and the second layer is a PLZT layer which comprises La at 7 to 8% of a compounding concentration.