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- W1996864561 abstract "Defects on the backside of a wafer during processing can come from many sources. Particles and scratches on the backsides of wafers can be caused by wafer handling equipment such as robots and chucks, as well as by CMP processes. In addition, cross-contamination of wafers and handling equipment can occur when wafers move from tool to tool, through the production line. When wafers are exposed, backside defects can cause localized areas of poor lithography pattern resolution on the frontsides of wafers, resulting in increased rework rates, decreased throughput, and yield loss. As minimum feature sizes continue to shrink with each new technology node, devices become denser and exposure tool depth of focus decreases - making the elimination of lithography hot spots an even more critical issue. At a major worldwide IDM, automated macro defect inspection tools for integrated front, edge, and backside inspection have been implemented to inspect wafers at several After Develop Inspection (ADI) and post-etch inspection steps. These tools have been used to detect foreign material and scratches on the backsides of several lots that were caused by another process tool, causing photolithography hot spots. This paper describes advanced macro inspection of wafer front and back surfaces and how the inspection data was used to correlate backside defects to photolithography hot spots, and take corrective action." @default.
- W1996864561 created "2016-06-24" @default.
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- W1996864561 date "2006-03-10" @default.
- W1996864561 modified "2023-09-25" @default.
- W1996864561 title "Correlation of wafer backside defects to photolithography hot spots using advanced macro inspection" @default.
- W1996864561 doi "https://doi.org/10.1117/12.656937" @default.
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