Machine Learning Based Wafer Defect Detection

被引:7
作者
Ma, Yuansheng [2 ]
Wang, Feng [1 ]
Xie, Qian [1 ]
Hong, Le [2 ]
Mellmann, Joerg [2 ]
Sun, Yuyang [2 ]
Gao, Shao Wen [1 ]
Singh, Sonal [1 ]
Venkatachalam, Panneerselvam [1 ]
Word, James [2 ]
机构
[1] Globalfoundries, 400 Stone Break Extens, Malta, NY 12020 USA
[2] Mentor Graph Corp, 8005 SW Boeckman Rd, Wilsonville, OR 97070 USA
来源
DESIGN-PROCESS-TECHNOLOGY CO-OPTIMIZATION FOR MANUFACTURABILITY XIII | 2019年 / 10962卷
关键词
Machine learning; hot spot; Si verification; wafer inspection; ORC (optical rule check); process window;
D O I
10.1117/12.2513232
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
Detecting and resolving the true on-wafer-hotspot (defect) is critical to improve wafers' yield in high volume manufacturing semiconductor foundries. As the integrated circuits process becomes more and more complex with the technology scaling, Optical Rule Check (ORC) alone could no longer identify the outlier-alike defects i.e. hot yield killer defects. Failing to detect yield-killer defects could be due to the lack of sufficient understanding and modeling in terms of etching, CMP, as well as other inter-layer process variations. In this paper, we present a fast and accurate defect detection flow with machine learning (ML) methodologies to address the compounding effects from different process stages. There are three parts in the defect detection ML model building flow: the first part is on the feature generation and data collection, the second on the ML model building, and the third on the full-chip prediction. We use limited amount of known defects found on wafer as input to train the ML model, and then apply the ML model to the full chip for prediction. The wafer verification data showed that our flow achieved more than 80% of defect hit rate with engineered feature extractions and ML model for an advanced technology node mask. The wafer results showed that machine learning has the capabilities of identifying new types of defects patterns and high-risk repetitive patterns such as SRAM.
引用
收藏
页数:8
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