A novel SONOS-type flash device with stacked charge trapping layer
Although enhancement in electrical properties of flash devices with HfO2 charge trapping layer has been reported, there are serious problems in retention characteristics. In this work, a novel SONOS-type flash device with TaN/Al2O3/HfO2/Si3N4/SiO2/Si structure is presented. Experimental results show that the program/erase speeds of the proposed devices can be enhanced by over one thousand times and the retention characteristic is improved as well.
flash device charge trapping layer bandgap engineering