Invention Grant
- Patent Title: Process-induced distortion prediction and feedforward and feedback correction of overlay errors
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Application No.: US16531940Application Date: 2019-08-05
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Publication No.: US11761880B2Publication Date: 2023-09-19
- Inventor: Pradeep Vukkadala , Haiguang Chen , Jaydeep K. Sinha , Sathish Veeraraghavan
- Applicant: KLA-Tencor Corporation
- Applicant Address: US CA Milpitas
- Assignee: KLA Corporation
- Current Assignee: KLA Corporation
- Current Assignee Address: US CA Milpitas
- Agency: Suiter Swantz pc llo
- Main IPC: G01N19/08
- IPC: G01N19/08 ; C23C14/54 ; G01L1/00 ; G01L5/00 ; G03F7/20 ; H01L21/66 ; G03F7/00

Abstract:
Systems and methods for prediction and measurement of overlay errors are disclosed. Process-induced overlay errors may be predicted or measured utilizing film force based computational mechanics models. More specifically, information with respect to the distribution of film force is provided to a finite element (FE) model to provide more accurate point-by-point predictions in cases where complex stress patterns are present. Enhanced prediction and measurement of wafer geometry induced overlay errors are also disclosed.
Public/Granted literature
- US20190353582A1 Process-Induced Distortion Prediction and Feedforward and Feedback Correction of Overlay Errors Public/Granted day:2019-11-21
Information query