Invention Grant
- Patent Title: EUV high throughput inspection system for defect detection on patterned EUV masks, mask blanks, and wafers
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Application No.: US14242802Application Date: 2014-04-01
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Publication No.: US09377414B2Publication Date: 2016-06-28
- Inventor: Yung-Ho Chuang , Richard W. Solarz , David R. Shafer , Bin-Ming Benjamin Tsai , David L. Brown
- 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: Bever, Hoffman & Harms, LLP
- Main IPC: G01N21/95
- IPC: G01N21/95 ; G01N21/956 ; G01N21/88

Abstract:
Inspection of EUV patterned masks, blank masks, and patterned wafers generated by EUV patterned masks requires high magnification and a large field of view at the image plane. An EUV inspection system can include a light source directed to an inspected surface, a detector for detecting light deflected from the inspected surface, and an optic configuration for directing the light from the inspected surface to the detector. In particular, the detector can include a plurality of sensor modules. Additionally, the optic configuration can include a plurality of mirrors that provide magnification of at least 100× within an optical path less than 5 meters long. In one embodiment, the optical path is approximately 2-3 meters long.
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