发明公开
- 专利标题: THIN-FILM PIEZOELECTRIC ELEMENT
- 专利标题(中): 压电性薄膜元件
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申请号: EP01953307申请日: 2001-07-23
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公开(公告)号: EP1311006A4公开(公告)日: 2007-07-25
- 发明人: KANNO ISAKU , HARA SHINTAROU , NAKANO TAKANORI
- 申请人: MATSUSHITA ELECTRIC IND CO LTD
- 专利权人: MATSUSHITA ELECTRIC IND CO LTD
- 当前专利权人: MATSUSHITA ELECTRIC IND CO LTD
- 优先权: JP2000222271 2000-07-24
- 主分类号: H01L41/187
- IPC分类号: H01L41/187 ; H01L41/22 ; H01L41/24 ; H01L41/316 ; H01L41/08
摘要:
To provide a piezoelectric thin film having an improved and stable characteristic by controlling stress applied during forming a piezoelectric thin film and providing the piezoelectric thin film having a perovskite structure. A thin film piezoelectric element in which a lower electrode is formed on a substrate, a piezoelectric thin film containing lead is formed on the lower electrode, and an upper electrode is further placed on the piezoelectric thin film, characterized in that the piezoelectric thin film is a dielectric with the perovskite structure having lead, zirconium, and titanium as the main ingredients, and is in a composition region in which, in the composition of the whole piezoelectric thin film, the Zr/(Zr + Ti) ratio is not less than 0.53, and has a crystal structure of the tetragonal system in which a c axis is longer than an a axis.
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