High-resolution three-dimensional scanning transmission electron microscopy characterization of oxide-nitride-oxide layer interfaces in Si-based semiconductors using computed tomography

Shoji Sadayama, Hiromi Sekiguchi, Alexander Bright, Naohisa Suzuki, Kazuhiro Yamada, Kenji Kaneko

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Oxide-nitride-oxide (ONO) layer structures are widely used for charge storage in flash memory devices. The ONO layer interfaces should be as flat as possible, so measurement of the nanoscale roughness of those interfaces is needed. In this study, quantification of an ONO film from a commercially available flash memory device was carried out with a pillar-shaped specimen using scanning transmission electron microscopy (STEM) and computed tomography. The ONO area contained only low Z-and low STEM-contrast materials, which makes high-quality reconstruction difficult. The optimum three-dimensional reconstruction was achieved with an STEM annular dark-field detector inner collection angle of 32 mrad, a sample tilt range from-78° to +78° and 25 iterations for the simultaneous iterative reconstruction technique.

    Original languageEnglish
    Pages (from-to)243-251
    Number of pages9
    JournalJournal of Electron Microscopy
    Volume60
    Issue number3
    DOIs
    Publication statusPublished - Jun 2011

    All Science Journal Classification (ASJC) codes

    • Instrumentation

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