发明授权
- 专利标题: Increasing exposure tool alignment signal strength for a ferroelectric capacitor layer
- 专利标题(中): 增加铁电电容层的曝光工具对准信号强度
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申请号: US12889851申请日: 2010-09-24
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公开(公告)号: US08586130B2公开(公告)日: 2013-11-19
- 发明人: Stephen Arion Meisner , Scott R. Summerfelt
- 申请人: Stephen Arion Meisner , Scott R. Summerfelt
- 申请人地址: US TX Dallas
- 专利权人: Texas Instruments Incorporated
- 当前专利权人: Texas Instruments Incorporated
- 当前专利权人地址: US TX Dallas
- 代理商 Rose Alyssa Keagy; W. James Brady; Frederick J. Telecky, Jr.
- 主分类号: B05D5/12
- IPC分类号: B05D5/12 ; H01L41/22
摘要:
An improved alignment structure for photolithographic pattern alignment is disclosed. A topographical alignment mark in an IC under a low reflectivity layer may be difficult to register. A reflective layer is formed on top of the low reflectivity layer so that the topography of the alignment mark is replicated in the reflective layer, enabling registration of the alignment mark using common photolithographic scanners and steppers. The reflective layer may be one or more layers, and may be metallic, dielectric or both. The reflective layer may be global over the entire IC or may be local to the alignment mark area. The reflective layer may be removed during subsequent processing, possibly with assist from an added etch stop layer, or may remain in the completed IC. The disclosed alignment mark structure is applicable to an IC with a stack of ferroelectric capacitor materials.
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