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In order to develop high density NAND flash device, the increased number of cell strings for 1 page buffer forces to form a long bit-line with low sheet resistance, as well as low parasitic capacitance between bit-lines. In this paper, we secured a copper damascene process to form 38 nm bit-lines with 76 nm pitch using SADP (self-aligned double patterning) process. The methods to minimize the sheet...
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