KEYWORDS: Metrology, Semiconducting wafers, Image processing, Metals, 3D metrology, Atomic force microscopy, Chemical mechanical planarization, 3D image processing, Wafer bonding, Data processing
The 3D NAND (three-dimensional NAND type) has rapidly become the standard technology for enterprise flash memories, and is also gaining widespread use in other applications. Continued manufacturing process improvements are essential in delivering memory devices with higher I/O performance, higher bit density, and lower cost. Current 3D NAND technology involves process steps that form array and peripheral CMOS (Complementary Metal-Oxide-Semiconductor) regions side-by-side, resulting in waste of silicon real estate and film stress compromises, and limits the paths of making advanced 3D NAND devices. An innovative architecture was invented to overcome these challenges by connecting two wafers electrically through millions of metal VIAs (Vertical Interconnect Access) simultaneously across the whole wafer in one process step [1]. A highly accurate and efficient metrology is required to monitor the VIA interface due to the increased process complexity and precision requirements. With the advanced processing of AFM (Atomic Force Microscopy) images, highly accurate and precise measurements have been achieved. An inline pattern-centric metrology solution that is designed for high volume mass production of high-performance 3D NAND is presented in this paper.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.