Patent ID: 8994090
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A nonvolatile semiconductor storage device comprising: a memory cell region including a memory cell having a charge storing layer above a gate insulating film and a control electrode stacked above the charge storing layer via an interelectrode insulating film; and a peripheral circuit region including a peripheral element having a first polysilicon and a first insulating film stacked above the first polysilicon; wherein the charge storing layer includes a polysilicon doped with P-type impurity, the polysilicon doped with the P-type impurity including a first upper region contacting the interelectrode insulating film, the first upper region having a first doped layer doped with carbon (C) or nitrogen (N), and at least a portion of a region below the first doped layer is neither doped with carbon (C) nor nitrogen (N), and wherein the first polysilicon includes a second upper region contacting the first insulating film, the second upper region having a second doped layer doped with carbon (C) or nitrogen (N), the second doped layer having a thickness equal to a thickness of the first doped layer.