Patent ID: 7804113
Filing Date: 2010-09-28
Classification: H01L

Abstract:
1. An anti-blooming structure for a back-illuminated imager formed in a substrate of a first conductivity type having a back side and a front side, comprising: a channel region of a second conductivity type formed in the substrate; a barrier region of the first conductivity type positioned in the substrate substantially overlying said channel region and proximal to the front side of the substrate; and a drain region of the second conductivity type positioned substantially overlying said barrier region, wherein when light impinges on the back side of the substrate the light generates charge carriers that collect in the channel region, the charge carriers passing through the barrier region into the drain region when a potential corresponding to the collected charge carriers in the channel region is about equal to the potential corresponding to the barrier region; at least one charge collecting gate at least partially overlying the drain region; and at least one charge transfer gate at least partially overlying the drain region proximal to the at least one charge collection gate.