Patent ID: 9085152
Filing Date: 2015-07-21
Classification: B41J,H01L,Y10T

Abstract:
1. A method comprising: forming a NiCr alloy layer as a lower electrode, providing a PZT piezoelectric material on the NiCr alloy layer, forming a TiW layer on the PZT piezoelectric material, providing a mask material comprising a NiCr alloy on the TiW layer, wherein the TiW layer between the mask material and the PZT piezoelectric material improves an adhesion of the mask material to the PZT piezoelectric material, patterning the mask material by wet etching to form a mask that defines a location of a trench, and plasma etching the PZT piezoelectric material through the mask to form a feature including the trench in the PZT piezoelectric material, the trench having an aspect ratio of depth to width of about 2:1 or more and having a depth of about 1 micron or more.