发明授权
- 专利标题： Metalorganic chemical vapor deposition of ferroelectric thin films
- 专利标题（中）： 铁电薄膜的金属有机化学气相沉积
-
申请号： US999738申请日： 1992-12-31
-
公开(公告)号： US5431958A公开(公告)日： 1995-07-11
- 发明人: Seshu B. Desu , Chien-Hsiung Peng
- 申请人： Seshu B. Desu , Chien-Hsiung Peng
- 申请人地址： JPX Osaka VA Blacksburg CO Colorado Springs
- 专利权人： Sharp Kabushiki Kaisha,Virginia Polytechnic Institute and State University,Ceram, Inc.
- 当前专利权人： Sharp Kabushiki Kaisha,Virginia Polytechnic Institute and State University,Ceram, Inc.
- 当前专利权人地址： JPX Osaka VA Blacksburg CO Colorado Springs
- 主分类号： C23C16/40
- IPC分类号： C23C16/40
摘要：
A method to produce high quality doped and undoped lead zirconate titanate (PZT) thin films by metalorganic chemical vapor deposition is disclosed. The PZT thin films with the perovskite structure were deposited on sapphire disks, Pt/Ti/SiO.sub.2 /Si wafers, and RuO.sub.x /SiO.sub.2 /Si wafers by both hot-wall and cold-wall CVD reactors at deposition temperature as low as 550.degree. C. and a reduced pressure 6 torr. The source materials include metalorganic precursors and oxidizing agent. The metalorganic precursors can be metal alkoxides, metal acetylacetonates, or metal .beta.-diketonates. Preferably, the precursors are lead tetramethylheptadione for Pb component, zirconium tetramethylheptadione for Zr component, and titanium ethoxide for Ti component and the oxidizing agent is oxygen. The stoichiometry of the films can be easily controlled by varying the individual precursor temperature and/or the flow rate of the carrier gas. The Pb(Zr.sub.0.82 Ti.sub.0.18)O.sub.3 film produced by the present invention shows a spontaneous polarization of 23.3 .mu.C/cm.sup.2, a remanent polarization of 12.3 .mu.C/cm.sup.2, and coercive field of 64.5 kV/cm.
公开/授权文献
信息查询
IPC分类:
