Patent ID: 6686617
Filing Date: 2004-02-03
Classification: H01L

Abstract:
A semiconductor chip comprising:at least one embedded memory device comprising a memory gate stack having a polysilicon layer, a tungsten-containing layer on top of the polysilicon layer, a silicon nitride cap layer on top of the tungsten-containing layer, and at least one sidewall having a sidewall oxide covering at least the sidewall of the polysilicon layer, the at least one embedded memory device being encapsulated by a first filler having a first concentration; and at least one logic device comprising a logic gate stack having a polysilicon layer, a sidewall oxide, and a metal salicide layer on top of the polysilicon layer, the at least one logic device being encapsulated by a second filler having a second concentration, wherein the first filler concentration is higher than the second filler concentration.