Patent ID: 7951674
Filing Date: 2011-05-31
Classification: H01L

Abstract:
1. A method for making SONOS memory, comprising: depositing a first oxide layer and a silicon oxynitride layer in sequence on the underlayer; coating a layer of photoresist on the silicon oxynitride layer; removing part of the photoresist and setting the area on the underlayer without being covered by the photoresist to be the logic area; removing the silicon oxynitride layer in the logic area by means of dry etching; removing the first oxide layer in the logic area by means of wet etching; removing the remaining photoresist and growing a second oxide layer on the surface of the abovementioned structure; removing the second oxide layer in the logic area by means of wet etching; growing gate oxide layer on the surface of the second oxide layer and the logic area; depositing polysilicon on the gate oxide layer, performing photo and etching treatment for polysilicon in the logic area to form SONOS memory.