Patent ID: 6410378
Filing Date: 2002-06-25
Classification: H01L,Y10S

Abstract:
A method of doping a semiconductor device, comprising:directing ions of a first type toward said semiconductor device; directing ions of a second type toward said semiconductor device; and protecting a portion of said semiconductor device from said ions of said second type; wherein: said semiconductor device includes a mask layer over a nitride layer that is over an oxide layer, the oxide layer being over a semiconductor substrate having an active area therein; directing ions of a first type toward said semiconductor device further comprises: implanting said ions of said first type into the active area, said ions of said first type passing through both the nitride layer and the oxide layer; removing the mask layer over the nitride layer; and implanting said ions of said first type into the semiconductor substrate; and directing ions of a second type toward said semiconductor device further comprises: removing the nitride layer over the oxide layer; implanting said ions of said second type into the semiconductor substrate, said ions of said second type passing through the oxide layer.