Patent ID: 6794239
Filing Date: 2004-09-21
Classification: H01L,Y10S

Abstract:
A method of doping a semiconductor device that includes a plurality of layers on a semiconductor substrate, comprising:directing ions of a first type toward said semiconductor device through a trench extending into said semiconductor device and terminating within the semiconductor substrate; 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 nitride layer that is over an oxide layer the oxide layer being over the semiconductor substrate having an active area, the semiconductor device also including the trench, said trench extending through the nitride layer and the oxide layer, and terminating within the semiconductor substrate beneath the active area; 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; and through a dielectric material previously formed in the trench.