发明授权
- 专利标题: Electrical connections to dielectric materials
- 专利标题(中): 与电介质材料的电气连接
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申请号: US09521504申请日: 2000-03-09
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公开(公告)号: US06215650B1公开(公告)日: 2001-04-10
- 发明人: Bruce E. Gnade , Scott R. Summerfelt
- 申请人: Bruce E. Gnade , Scott R. Summerfelt
- 主分类号: H01G406
- IPC分类号: H01G406
摘要:
A preferred embodiment of this invention includes an oxidizable layer (e.g. tantalum 48), an oxygen gettering layer (e.g. platinum/tantalum mixture 34) overlaying the oxidizable layer, a noble metal layer (e.g. platinum 36) overlaying the oxygen gettering layer, and a high-dielectric-constant material layer (e.g. barium strontium titanate 38) overlaying the noble metal layer. The novel structures presented provide electrical connection to high-dielectric-constant materials without the disadvantages of current structures. The oxygen gettering layer controls oxygen diffusion, minimizing the formation of a resistive layer either in the lower electrode or at the lower electrode/substrate interface. The oxygen gettering layer acts as a gettering site for oxygen, where the oxygen oxidizes the reactive metal portion of the layer, leaving the noble metal portion of the layer intact. While the oxides/suboxides (e.g. tantalum pentoxide 40) that are formed are resistive, they are dispersed within the noble metal matrix, leaving a conductive path from the top of the layer to the bottom. This invention provides a stable and electrically conductive electrode for high-dielectric-constant materials while using standard integrated circuit materials to facilitate and economize the manufacturing process.
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