Invention Grant
- Patent Title: Hybrid overlay target design for imaging-based overlay and scatterometry-based overlay
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Application No.: US15995731Application Date: 2018-06-01
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Publication No.: US11112369B2Publication Date: 2021-09-07
- Inventor: David Gready
- Applicant: KLA-TENCOR CORPORATION
- Applicant Address: US CA Milpitas
- Assignee: KLA-TENCOR CORPORATION
- Current Assignee: KLA-TENCOR CORPORATION
- Current Assignee Address: US CA Milpitas
- Agency: Hodgson Russ LLP
- Main IPC: G01N21/95
- IPC: G01N21/95 ; G01N21/956 ; G01B11/27 ; G01N21/47 ; G03F7/20 ; H01L21/66

Abstract:
Designs for a hybrid overlay target design that includes a target area with both an imaging-based target and a scatterometry-based target are disclosed. The imaging-based overlay target design can include side-by-side grating structure. A scatterometry-based overlay target design at a different location in the target area can include grating-over-grating structure. A method of measuring the hybrid overlay target design and a system with both an imaging optical system and a scatterometry system for measuring the hybrid overlay target design are also disclosed.
Public/Granted literature
- US11079335B2 Hybrid overlay target design for imaging-based overlay and scatterometry-based overlay Public/Granted day:2021-08-03
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