Patent ID: 7932154
Filing Date: 2011-04-26
Classification: H01L

Abstract:
1. A method of fabricating a non-volatile flash memory device, comprising: defining a cell region and a peripheral circuit region in a semiconductor substrate; forming a cell active region and a peripheral circuit active region in the cell region and the peripheral circuit region, respectively; performing a first ion implantation into the cell active region to form a first channel region; performing a second ion implantation into the peripheral circuit active region to form a peripheral circuit channel region; sequentially stacking a tunneling layer, a charge trap layer and a passivation layer on the semiconductor substrate; forming a first photoresist pattern on the semiconductor substrate having the passivation layer, the first photoresist pattern covering a portion of the passivation layer on the first channel region; sequentially patterning the passivation layer, the charge trap layer and the tunneling layer using the first photoresist pattern as a mask; removing the first photoresist pattern; forming a second photoresist pattern covering the passivation layer and the peripheral circuit region; performing a third ion implantation using the second photoresist pattern as a mask to form a second channel region in the cell active region; and removing the second photoresist pattern.