Patent ID: 9071222
Filing Date: 2015-06-30
Classification: H03H,Y10T

Abstract:
1. A method for forming a multi-layer electrode for contacting a micro acoustic device comprising: providing a substrate; applying a first conductive layer of a first alloy-forming metal to a surface of the substrate or a layer lying in between; applying a third layer of a non-alloy-forming material to a surface of the first layer, wherein the third layer has a thickness of 2-50 nm and the third layer comprises W, TiN, Al applying a second conductive layer of a second alloy-forming metal to a surface of the third layer, wherein the first conductive layer, the third layer and the second conductive layer together form the multi-layer electrode and wherein the third layer serves as a diffusion barrier to prevent diffusion of atoms of the first conductive layer into the second conductive layer and/or diffusion of atoms of the second conductive layer into the first conductive layer, and wherein forming the first conductive layer, the third layer and the second conductive layer comprises forming a part of a micro acoustic component; after applying the second conductive layer, applying a fourth conductive layer to the second conductive layer, the fourth conductive layer comprising a material with a high acoustic impedance, wherein an active layer of the micro acoustic device is applied to the fourth conductive layer; and wherein: