Koji OHASHI,Takahiro KAMIJO,Katsuhiro IMAI,Takumi YAMAOKA,Chikara KOJIMA
申请号：
US15935539
公开号：
US20180277738A1
申请日:
2018.03.26
申请国别(地区):
US
年份:
2018
代理人:
摘要：
A piezoelectric element has a first electrode layer, a piezoelectric layer on the first electrode layer, a second electrode layer on the piezoelectric layer, a third electrode layer on part of the second electrode layer and including third metal, and an insulating layer covering at least a part of the piezoelectric layer not provided with the second electrode layer and having an aperture exposing a part of the second electrode layer. The second electrode layer has a first layer including first metal and a second layer including second metal on the first layer. The second layer is exposed in the aperture. A difference in standard redox potential between the second metal and the third metal is smaller than a difference in standard redox potential between the first metal and the third metal.
