Patent ID: 7678674

Claim:
A method of forming implants for a memory cell, comprising: forming an oxide-nitride-oxide (ONO) stack over a substrate; implanting first p-type impurities in the substrate adjacent each side of the ONO stack at a dosage of about 5E13 atoms/cm 2 to about 1E15 atoms/cm 2 , at an implantation energy of about 2 KeV to about 5 KeV, and at a tilt angle of approximately 0 degrees to approximately 5 degrees relative to an upper surface of the substrate, wherein the first p-type impurities control program and erase speed for the memory cell; and implanting second p-type impurities in the substrate adjacent each side of the ONO stack at a dosage of about 1E13 atoms/cm 2 to about 1E14 atoms/cm 2 , at an implantation energy of about 7 KeV to about 20 KeV, and at a tilt angle of approximately 35 degrees to approximately 55 degrees relative to an upper surface of the substrate, wherein the second p-type impurities control a threshold voltage (V T ) for the memory cell.