Dissertation/Thesis Abstract

An Assessment of Critical Dimension Small Angle X-ray Scattering Metrology for Advanced Semiconductor Manufacturing
by Settens, Charles M., Ph.D., State University of New York at Albany, 2015, 239; 3701713
Abstract (Summary)

Simultaneous migration of planar transistors to FinFET architectures, the introduction of a plurality of materials to ensure suitable electrical characteristics, and the establishment of reliable multiple patterning lithography schemes to pattern sub-10 nm feature sizes imposes formidable challenges to current in-line dimensional metrologies. Because the shape of a FinFET channel cross-section immediately influences the electrical characteristics, the evaluation of 3D device structures requires measurement of parameters beyond traditional critical dimension (CD), including their sidewall angles, top corner rounding and footing, roughness, recesses and undercuts at single nanometer dimensions; thus, metrologies require sub-nm and approaching atomic level measurement uncertainty.

Synchrotron critical dimension small angle X-ray scattering (CD-SAXS) has unique capabilities to non-destructively monitor the cross-section shape of surface structures with single nanometer uncertainty and can perform overlay metrology to sub-nm uncertainty. In this dissertation, we perform a systematic experimental investigation using CD-SAXS metrology on a hierarchy of semiconductor 3D device architectures including, high-aspect-ratio contact holes, H 2 annealed Si fins, and a series of grating type samples at multiple points along a FinFET fabrication process increasing in structural intricacy and ending with fully fabricated FinFET. Comparative studies between CD-SAXS metrology and other relevant semiconductor dimensional metrologies, particularly CD-SEM, CD-AFM and TEM are used to determine physical limits of CD-SAXS approach for advanced semiconductor samples. CD-SAXS experimental tradeoffs, advice for model-dependent analysis and thoughts on the compatibility with a semiconductor manufacturing environment are discussed.

Indexing (document details)
Advisor: Matyi, Richard J.
Commitee: Bello, Abner F., Dunn, Kathleen, Hartley, John G., Thiel, Bradley
School: State University of New York at Albany
Department: Nanoscale Science and Engineering-Nanoscale Science
School Location: United States -- New York
Source: DAI-B 76/09(E), Dissertation Abstracts International
Source Type: DISSERTATION
Subjects: Nanoscience, Optics
Keywords: Critical dimension, FinFETs, Metrology, Semiconductor manufacturing, Small angle x-ray scattering
Publication Number: 3701713
ISBN: 9781321725599
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