Patent ID: 6756272
Filing Date: 2004-06-29
Classification: H01L,Y10S

Abstract:
A method of manufacturing a non-volatile semiconductor memory device, comprising:a depositing step of depositing a first insulating film (14) on top of a drain region; a removing step of removing a part of the said first insulating film deposited (14), where the part is located far away from its corresponding depletion layer; an oxidizing step of oxidizing the surface area of the said part, so as to form a second insulating film (15), which is thinner than the said first insulating film (14); a step of forming a first nitride film (12a) on an insulating film (11), which is deposited on the surface of the drain region (5), its corresponding channel region (23), and its corresponding source region (4), and also above the said channel region; wherein the said removing step forms a side wall of the said insulating film (14) on the side of the said first nitride film formed (12a); and a step of forming a second nitride film (12b) on a device isolating/insulating film (3), so that the distance between the said second nitride film (12b) and the said first nitride film (12a) can be longer than the distance between the said first nitride film (12a) and its adjacent first nitride film (12a).