Patent ID: 6018186
Filing Date: 2000-01-25
Classification: H01L

Abstract:
A three-dimensional, high-density ROM, comprising:a plurality of parallel bit lines formed in a silicon substrate, each of the bit lines having a depth substantially equal to the depth of the other bit lines;a plurality of word lines running perpendicular to and above the bit lines; anda plurality of memory cells, each memory cell being formed at a junction of two adjacent bit lines and a portion of one of the word lines and having a channel region, the channel region having a depth and containing gate oxide and polysilicon, the plurality of memory cells including a plurality of non-conducting memory cells and a plurality of conducting memory cells, the channel region of the conducting memory cells having a depth substantially equal to the depth of the plurality of bit lines, the channel region of the non-conducting memory cells having a depth greater than the depth of the channel region of the conducting memory cells and penetrating through the bit lines.