Invention Grant
- Patent Title: Method for making COP evaluation on single-crystal silicon wafer
- Patent Title (中): 在单晶硅晶片上进行COP评估的方法
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Application No.: US12308060Application Date: 2007-05-22
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Publication No.: US08173449B2Publication Date: 2012-05-08
- Inventor: Shuichi Inami
- Applicant: Shuichi Inami
- Applicant Address: JP Tokyo
- Assignee: Sumco Corporation
- Current Assignee: Sumco Corporation
- Current Assignee Address: JP Tokyo
- Agency: Clark & Brody
- Priority: JP2006-161094 20060609
- International Application: PCT/JP2007/060425 WO 20070522
- International Announcement: WO2007/142024 WO 20071213
- Main IPC: G01R31/26
- IPC: G01R31/26 ; H01L21/66

Abstract:
An evaluation area of an evaluation object wafer is concentrically divided in a radial direction, an upper limit value to the number of COPs is set in each divided evaluation segment, and an acceptance determination of the single-crystal silicon wafer is made using the upper limit value as a criterion. Thereby, a quantitative and objective COP evaluation can be made, and a proper determination is made based on a clear criterion. The evaluation method of the present invention can sufficiently deal with automation of the COP evaluation (inspection) and the higher-quality wafer in the near future, and the evaluation method can be widely applied to production of the single-crystal silicon wafer and production of a semiconductor device.
Public/Granted literature
- US20090197358A1 Method for making COP evaluation on single-crystal silicon wafer Public/Granted day:2009-08-06
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