Invention Grant
- Patent Title: Alignment and registration targets for multiple-column charged particle beam lithography and inspection
- Patent Title (中): 多列带电粒子束光刻和检查的对准和配准目标
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Application No.: US14522563Application Date: 2014-10-23
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Publication No.: US09595419B1Publication Date: 2017-03-14
- Inventor: Kevin M. Monahan , Michael C. Smayling , Theodore A. Prescop , David K. Lam
- Applicant: Multibeam Corporation
- Applicant Address: US CA Santa Clara
- Assignee: Multibeam Corporation
- Current Assignee: Multibeam Corporation
- Current Assignee Address: US CA Santa Clara
- Agent Seth A. Horwitz
- Main IPC: H01J37/22
- IPC: H01J37/22 ; H01J37/26

Abstract:
The present application discloses methods, systems and devices for using charged particle beam tools to pattern and inspect a substrate. The inventors have discovered that it is highly advantageous to use patterns generated using the Hadamard transform as alignment and registration marks (Hadamard targets) for multiple-column charged particle beam lithography and inspection tools. Further, superior substrate alignment and layer-to-layer pattern registration accuracy can be achieved using Hadamard targets patterned in edge-proximal portions of the substrate that are typically stripped bare of resist prior to lithography, in addition to Hadamard targets patterned in inner substrate portions. High-order Hadamard targets can also be patterned and imaged to obtain superior column performance metrics for applications such as super-rapid beam calibration DOE, column matching, and column performance tracking. Superior alignment and registration, and column parameter optimization, allow significant yield gains.
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