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A novel three-dimensional (3D) NAND structure containing both vertical gate (VG) framework and gate-all-around (GAA) cell structure is innovated and demonstrated. It is fabricated on alternating layers of silicon dioxide (OX) and polysilicon (PL) by using 43nm technology. To our knowledge, one of the major advantages of the novel structure is the smaller cell unit footprint than vertical channel (VC)...
Pattern dependent charging effect is explored in this study. Due to increased film thickness in 3D NAND structure, a derivative problem-the plasma-induced charging damage is enhanced during high aspect ratio (HAR) etching. In this paper, several effective methods are demonstrated to alleviate the impact of profile distortion due to charging effect while etching high aspect ratio (>14) trenches.
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