Journal
OPTICS AND LASERS IN ENGINEERING
Volume 171, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2023.107819
Keywords
spectral interference ellipsometry; film thickness; transparent substrate
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This paper proposes an orthogonal polarization common-path film thickness measurement system based on spectral interference ellipsometry. It solves the issue of back-surface reflection and achieves high measurement accuracy.
Measuring film thickness on transparent substrate is crucial and universal for semiconductor chips. This paper proposes an orthogonal polarization common-path film thickness measurement system without the frustration of back-surface reflection based on spectral interference ellipsometry. The proposed system demonstrates that the phase stability of spectral interference reached 5x10-4 rad under common path. Combined with ellipsometry, the back-surface reflection issues were theoretically deduced and solved by the proposed system. The measured thicknesses of three kinds of film specimens on transparent substrates agreed well with those determined using a commercial ellipsometer. The measurement precision was greater than 1 nm.
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