Invention Application
- Patent Title: METHOD OF CORRECTING WAFER BOW USING A DIRECT WRITE STRESS FILM
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Application No.: US17703072Application Date: 2022-03-24
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Publication No.: US20220336226A1Publication Date: 2022-10-20
- Inventor: Charlotte CUTLER , Michael MURPHY , David CONKLIN
- Applicant: Tokyo Electron Limited
- Applicant Address: JP Tokyo
- Assignee: Tokyo Electron Limited
- Current Assignee: Tokyo Electron Limited
- Current Assignee Address: JP Tokyo
- Main IPC: H01L21/324
- IPC: H01L21/324 ; G03F7/00

Abstract:
Techniques herein include methods for forming a direct write, tunable stress film and methods for correcting wafer bow using said stress film. The method can be executed on a coater-developer tool or track-based tool. The stress film can be based on a film that undergoes crosslinking/decrosslinking under external stimulus where direct write is achieved by, but is not limited to, 365 nm exposure and subsequent cure is used to “pattern-in” stress. No develop step may be required, which provides additional significant benefit in conserving film planarity. An amount of bow (or internal stress to create or affect a bow signature) can be tuned with exposure dose, bake temperature, bake time and number of bakes.
Information query
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