Invention Grant
- Patent Title: Advanced wafer security method including pattern and wafer verifications
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Application No.: US16412648Application Date: 2019-05-15
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Publication No.: US11031346B2Publication Date: 2021-06-08
- Inventor: Effendi Leobandung , Carol Boye , Fee Li Lie , Shravan Kumar Matham , Brad Austin
- Applicant: International Business Machines Corporation
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Scully, Scott, Murphy & Presser, P.C.
- Agent L. Jeffrey Kelly, Esq.
- Main IPC: H01L23/544
- IPC: H01L23/544 ; H01L21/66

Abstract:
An advanced security method for verifying that integrated circuit patterns being processed into one or more layers provided to a wafer are trusted patterns and that the wafer being used during processing is a trusted wafer is provided. The method includes separate steps of pattern verification and wafer verification. Notably, the method includes first verifying that a pattern printed on a wafer matches a pattern of a trusted reference. Next, a peak and valley profile present at a specific location on a backside surface of the wafer is measured. The method further includes second verify that the measured peak and valley profile matches an original peak and valley profile measured at the same location on the backside surface of the wafer.
Information query
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