Patent ID: 6677255
Filing Date: 2004-01-13
Classification: H01L,Y10S

Abstract:
A method of manufacturing a semiconductor device, comprising:providing a wafer substrate; providing an insulator over the wafer substrate; depositing a first polysilicon layer over the insulator; forming a layer of stacked oxide-nitride-oxide layer over the first polysilicon layer; depositing a second silicon layer over the layer of stacked oxide-nitride-oxide layer; providing a layer of photoresist over the second silicon layer; patterning and defining the photoresist layer; etching the second silicon layer and stacked oxide-nitride-oxide layer unmasked by the photoresist; removing the photoresist layer; providing a cleaning solution to the stacked oxide-nitride-oxide layer with the second silicon layer as a mask; and depositing a third layer of polysilicon over the second silicon layer.