Fabrication of SONOS-type flash memory with the binary high-k dielectrics by the sol-gel spin coating method

Abstract

We fabricated the binary high-k (HfxZr1-xO2) nanocrystal memory using a very simple sol-gel spin coating method and 900 degrees C 60 s rapid thermal annealing (RTA). From the transmission electron microscopy identification, the nanocrystals were formed as the monolayered charge trapping site after 900 degrees C 60 s RTA and the size was ca. 5 nm. We verified the electrical properties in terms of program-erase speed, charge retention, and endurance. The sol-gel device exhibited the long charge retention time of 10(4) s with only 2.5% charge loss, and good endurance performance for program/erase cycles up to 10(5). (c) 2007 The Electrochemical Society.