ACOUSTIC WAVE DEVICE

Organization Name

Murata Manufacturing Co., Ltd.

Inventor(s)

Yasumasa Taniguchi of Nagaokakyo-shi JP

Haruki Kyouya of Nagaokakyo-shi JP

Daisuke Tamazaki of Nagaokakyo-shi JP

ACOUSTIC WAVE DEVICE

This abstract first appeared for US patent application 19013107 titled 'ACOUSTIC WAVE DEVICE

Original Abstract Submitted

An acoustic wave device includes a piezoelectric substrate and an interdigital transducer electrode on the piezoelectric substrate. The interdigital transducer electrode includes a close-contact layer on the piezoelectric substrate, a Cu—Al alloy layer on the close-contact layer, and an Al electrode layer on the Cu—Al alloy layer and having a weight-percentage concentration, in % by weight, of Al of greater than about 50% by weight. The Cu—Al alloy layer and the Al electrode layer are epitaxial layers. A thickness of the Cu—Al alloy layer is about 40% or less of a total thickness of the Cu—Al alloy layer and the Al electrode layer.