A nonvolatile semiconductor memory device including a source region and a drain region formed on a surface of a semiconductor substrate, a channel-forming region formed so as to connect the source region and the drain region or so as to be sandwiched between the source region and the drain region, a...http://www.google.com/patents/US7355238?utm_source=gb-gplus-sharePatent US7355238 - Nonvolatile semiconductor memory device having nanoparticles for charge retention
