Patent ID: 9209382
Filing Date: 2015-12-08
Classification: H01L

Abstract:
1. A piezoelectric component comprising: a stack of piezoelectric layers arranged on one another and electrode layers arranged between the piezoelectric layers, wherein the stack comprises at least one first piezoelectric layer having a first piezoelectric charge constant; a second piezoelectric layer directly neighboring the first piezoelectric layer and having a second piezoelectric charge constant, the piezoelectric charge constant describing an expansion of the piezoelectric layer perpendicular to an electric field when a voltage is applied to the electrode layers, wherein one of the first piezoelectric charge constant and the second piezoelectric charge constant is greater than the other piezoelectric charge constant by a factor of from 1.2 to 3.0; and a contact interface separating the first piezoelectric layer and the second piezoelectric layer, wherein applying the voltage to the electrode layers results in different expansion of the first piezoelectric layer and the second piezoelectric layer to form cracks at the contact interface and guide the cracks along the contact interface, the different expansion resulting from the difference in the first piezoelectric charge constant and the second piezoelectric charge constant.