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The three-dimensionally alternating integration of stackable logic devices with memory cells represents a revolutionary approach to the fabrication of extremely high density memory devices. Conventional silicon-based memory devices face impending limits if they are progressively scaled toward smaller-sized features. Here, we present a high-density memory architecture that utilizes electronically active...
Vertical NAND flash memory cell array by TCAT (terabit cell array transistor) technology is proposed. Damascened metal gate SONOS type cell in the vertical NAND flash string is realized by a unique dasiagate replacementpsila process. Also, conventional bulk erase operation of the cell is successfully demonstrated. All advantages of TCAT flash is achieved without any sacrifice of bit cost scalability.
A 3-D flash memory cell of VRAT (vertical-recess-array-transistor) has been fabricated using a unique and simple 3-D integration method of PIPE (planarized integration on the same plane), which allows for the successful implementation of ultra high density flash memory. In addition, procedures to increase the memory density further using another advanced structure, Zigzag-VRAT (Z-VRAT), are developed.
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