Patent ID: 9406862
Filing Date: 2016-08-02
CPC Classification: C30B,H01L,H03H

Claim Text:
1. An elastic wave device comprising: a piezoelectric substrate including a primary surface; a first electrode provided on the primary surface of the piezoelectric substrate and including a first multilayer metal film including at least three metal films laminated in a bottom-to-top direction, and at least an IDT electrode; a second electrode provided above the primary surface of the piezoelectric substrate and including a second multilayer metal film including metal films laminated in the bottom-to-top direction; and a contact portion at which the first electrode and the second electrode are electrically connected to each other and defined by a portion at which a bottommost film of the second multilayer metal film and a topmost film of the first multilayer metal film are overlapped with each other; wherein the first multilayer metal film includes an epitaxial Ti film defining the topmost film and an epitaxial AlCu film, the epitaxial Ti film having a crystal orientation oriented in a predetermined direction so that a normal line direction of a (001) plane of a Ti crystal of the epitaxial Ti film coincides with a Z axis of a crystal of a piezoelectric body defining the piezoelectric substrate; and the second multilayer metal film includes a Ti film as the bottommost film.