薄脆饼
材料科学
位错
光学
蚀刻(微加工)
航程(航空)
光电子学
物理
纳米技术
复合材料
图层(电子)
作者
Andrey Soukhojak,Tyler Stannard,Ian Manning,Charles Lee,Gil Yong Chung,Matthew Gave,Edward Sanchez
出处
期刊:Materials Science Forum
日期:2022-05-31
卷期号:1062: 304-308
摘要
X-ray topography (XRT) presents itself as an attractive non-destructive method to replace industry-standard destructive KOH etching used to measure dislocation density. However, a production-line-compatible XRT has to employ a low scan speed in order to work well with automated image analysis, which makes it impractical for a high-volume manufacturing to scan an entire wafer. We introduce the “radial band” approach to sampling the entire wafer’s area with a single-pass 16 mm tall scan band. Such a band spans the entire range of radii and thus captures the typically strong radial dependence of dislocation density over the entire range, while mostly ignoring the typically weak angular dependence of dislocation density and averaging the inevitable noise over the 16 mm band height. The XRT scan time savings for this approach are roughly 15-fold and 20-fold for 150mm and 200mm wafers respectively.
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