Patent ID: 7977734
Filing Date: 2011-07-12
Classification: H01L

Abstract:
1. A silicon-oxide-nitride-oxide-silicon (SONOS) flash memory, comprising: a silicon substrate; a silicon oxide-silicon nitride-silicon oxide (ONO) layer over the silicon substrate; a polysilicon layer over the silicon oxide-silicon nitride-silicon oxide (ONO) layer, the polysilicon layer including a first polysilicon layer and a second polysilicon layer over the first polysilicon layer; and a dielectric layer between portions of the first polysilicon layer, wherein the first polysilicon layer has an inverse trapezia section along a direction of word line and the dielectric layer has a trapezia section along the direction of word line, and an acute angle of the inverse trapezia or the trapezia ranges from 85° to 88°.