发明授权
- 专利标题: Photolithography overlay control
- 专利标题(中): 光刻覆盖控制
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申请号: US09971329申请日: 2001-10-04
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公开(公告)号: US06472316B1公开(公告)日: 2002-10-29
- 发明人: James R. B. Elmer , Eric J. Kirchner
- 申请人: James R. B. Elmer , Eric J. Kirchner
- 主分类号: H01L214763
- IPC分类号: H01L214763
摘要:
A method for forming an alignment feature on a substrate. The alignment feature is of the type concurrently formed with an electrically conductive layer overlying an electrically nonconductive layer having vias. The vias are filled with an electrically conductive material, and the alignment feature has a smaller aspect ratio than the vias. The alignment feature is not filled with the electrically conductive material when a first amount of the electrically conductive material, sufficient to just fill the vias, is deposited on the substrate. The first amount of the electrically conductive material within the alignment feature is not sufficient to prevent the alignment feature in the electrically conductive layer from distorting, and thereby reducing the effectiveness of the alignment feature. The improvement is in depositing an additional amount of the electrically conductive material on the substrate. The additional amount is more than the first amount that is just sufficient to fill the vias, and fills the alignment feature to a level sufficient to prevent the alignment feature in the electrically conductive layer from distorting and reducing the effectiveness of the alignment feature.
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