Comparison of SEM and AFM performances for LER reference metrology
Comparison of SEM and AFM performances for LER reference metrology
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LER 参考计量的 SEM 和 AFM 性能比较
DOI:
10.1117/12.2551468
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Gonda Satoshi
中科院分区:
文献类型:
--
作者:
Kizu Ryosuke;Misumi Ichiko;Hirai Akiko;Gonda Satoshi
Line edge roughness (LER) measurement of a nanoscale line pattern is a metrology challenge in the inspection of semiconductor devices. Conventional scanning electron microscopy (SEM), a classical LER measurement technique, is a top-view (2D) metrology and incapable of accurately measuring 3D structures. For LER measurements, SEM measurement generates a single line edge profile for the 3D sidewall roughness, although the line edge profile differs at each height in the 3D sidewall. In this study, we used atomic force microscopy (AFM) with the tip-tilting technique to measure the 3D sidewall roughness, as an LER reference metrology. An identical location of a line pattern measured by SEM and AFM was compared to evaluate the SEM’s performance. The line edge profile from the AFM measurement exhibited lower noise than that from SEM. The measured line edge profiles were analyzed using the power spectral density (PSD), height-height correlation function (HHCF), and autocorrelation function. The results demonstrate that the standard deviation (σ) and correlation length (ξ) are overestimated while the roughness exponent (α) is underestimated by SEM, considering the AFM results as reference values.
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