Patent ID: 7623384
Filing Date: 2009-11-24
Classification: G11C,H01L

Abstract:
1. A nonvolatile semiconductor memory comprising: a source line side selection gate transistor that includes a first source region connected to a source line and a first gate electrode connected to a first select gate line; a bit line side selection gate transistor that includes a second drain region connected to a bit line and a second gate electrode connected to a second select gate line; a first memory cell string that includes a plurality of memory cell transistors connected in series, connected between a first drain region of the source line side selection gate transistor and a second source region of the bit line side selection gate transistor; and a second memory cell string that includes a plurality of memory cell transistors connected in series, connected between the first drain region of the source line side selection gate transistor and the second source region of the bit line side selection gate transistor; wherein the first memory cell string and the second memory cell string are stacked on a semiconductor substrate via an interlayer insulating film, wherein the source line side selection gate transistor and the bit line side selection gate transistor are placed on the semiconductor substrate, and wherein at least one of the source line side selection gate transistor and the bit line side selection gate transistor is formed between the semiconductor substrate and a lower one of the first memory cell string and the second memory cell string.